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DIY Classic Mini Engine Articles

“BACKWARD COMPATIBILITY” IN NEW ENGINE OILS ? (Technical Information)
MUST READ COMPLETELY ! -  DANGER—DANGER—DANGER - EditorialNow that I have your attention, please bear with me…...This may seem to be redundant, but anything worth repeating, is worth repeating twice as the old saying goes.This newsletter is going to cover a recently discovered subject matter of the very most importance to everyone who owns vehicles of any kind, be it, automotive, trucking, construction equipment, etc. The results are in with very dismaying reports concerning the newest API engine oil specifications, SM / CJ-4.To put it very bluntly and to the point, the newest specifications for both gas and diesel have not been satisfactory for use in engines prior to 2007.In the past, when engine oils changed formulation to meet the most up-to-date specs, those fo...
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1275cc A Series Engine Color Schemes, Sprites & Midgets (Technical Information)
1275cc A Series Engine Color Schemes Only engines bearing a 12CC engine no. prefix were painted in British Motor Corporation Engine Green(the color somewhere between sage green and olive green applied to the power units in most BMC motor vehicles, including all the Sprite and Midget variants prior to 1967). This equates to roughly the first year of 1275 production. Following this (from 1968 to 197...
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A Supercharged Comparison (Technical Information)
A Supercharged Comparison   The following shows the comparison of using a Mini Mania supercharger kit on two different versions of the same engine. The engine was run on the same chassis dynamometer (“rolling road”) before the supercharger was added and after each major engine update. The first and third versions were run at approximately 70 degrees F and the second at approxim...
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ARP Bolts & Fasteners (Technical Information)
Fastener Retention Overview There are three methods that can be employed to determine how much tension is exerted on a fastener; using a torque wrench, measuring the amount of stretch, and turning the fastener a pre-determined amount (torque angle). Of these methods, use of a stretch gauge is the most accurate. It is important to note that in order for a fastener to function properly it must be ...
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Belt drive for charging systems C-AEA536 (Technical Information)
FITTING INSTRUCTIONS This kit is an ‘add on’ for the C-AEA534 toothed belt water pump drive for the charging system. The large alternator/dynamo pulley is driven from the water pump pulley by a separate belt, thus ensuring the vehicle is still driveable should the charging system belt fail as the water pump will still function. Do not over tighten belt. Correct tension is when you ...
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Big-Bore Power Units from MINI MANIA for the Mini Cooper (Technical Information)
Big-Bore Power Units from MINI MANIA for the Mini CooperThe "Ultimate Street Performance Engine" from Mini Mania is the result of 30 years of building and racing our fabulous Mini Cooper. Because driveability and reliability are of utmost importance, only components from well established suppliers are utilized.  The cylinder head is a genuine Longman GT6 or one of our special Aluminum he...
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Building the Lower End (Restoration)
Building the Lower End November 6, 2012 The guy we bought the Mini from sent us this photo With the machine work done, it was time to start engine assembly We used ARP assembly lube on our new main bearings We took our block, stock Cooper S rods and crank to Gerald and Charlie’s Auto Machine Shop in Sanford, Florida. This is a good, local shop that pri...
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C-AEG619 Ultra-light flywheel fitting instructions (Installation Instructions)
This flywheel is not balanced so should be before use, along with the prospective clutch assembly. Before fitting the Mini Spares Ultra-light steel flywheel, carefully examine the crankshaft taper for any burrs or other protrusions caused by fret-welding of previous flywheels. All protrusions of any sort must be removed as they will cause incorrect seating of the flywheel which could, in turn, ca...
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Centre Main Cap Strap Fitting Instructions, CMS10 (Technical Information)
This strap is used to give support and strengthen the centre main bearing cap on small-bore engines (850/998/1098cc). It helps counter the problems caused at higher rpm where crankshaft flex (‘whip’) causes the standard cap to move (‘shuffle’) leading to bearing failure and possible breakage of the main bearing caps. In particular, where higher rpm than standard will be...
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Centre Main Cap Strap Fitting Instructions, CMS13 (Technical Information)
This strap is used to give support and strengthen the centre main bearing cap on large-bore engines (1275cc-plus). It helps counter the problems caused at higher rpm where crankshaft flex (‘whip’) causes the standard cap to move (‘shuffle’) leading to bearing failure and possible breakage of the main bearing caps. In particular, where higher rpm than standard will be th...
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Classic Mini Cooper Piston Ring Compressor Tool (Installation Instructions)
Installing piston rings in a Mini engine has never been easier.  With the availability of a simple precision tool the entire process will take only minutes.  When you purchase a new set of pistons and rings it is safe to be compfortable that the 'end gap' on the factory rings will have already been machined to the correct tolerances and thus are ready to install.  When you purchas...
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Cooper Engine Data (Technical Information)
  Mini Cooper 997cc (type 9F) Engine Data   Number of Cylinders 4 Bore 2.458in (62.43mm) Stroke 3.20in (81.28mm) Capacity 60.87 cu in (997cc) Compression Ratio (H prefix) 9.1 Compression Ratio (L prefix) 8.3:1 BMEP (H prefix) 134 psi (9.42kg/cm2) at 3500rpm BMEP (L prefix) 129 psi (9.07kg/cm2) at 3500rpm Torque (H prefix) 5...
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Cooper Engine Tuning Data (Technical Information)
The tables below shows the factory tuning specifications for the various models of Mini Cooper. If your engine is modified, these settings may no longer be valid or provide safe operation of your engine. These specifications are those as given by British Leyland at approximately the end of Mini Cooper S production in 1971. Older ...
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Crankshaft - Standard production crank identification (Calver's Corner)
Below is a list of crankshaft identification data by forging or stamped numbers - yes, contrary to what many say/express, all cranks are forged. None are cast. They wouldn't last 2 minutes in an engine if they were cast - they'd be way too brittle. The differences are in the material used, finish machining detail and any heat treatments applied. It is by no means complete and utterly correct/infal...
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DEVES Piston Ring Installation (Technical Information)
  GENERAL INSTALLATION -- PISTON RINGS   General Installation Details   Are Deves Rings Hard to Install? NO! They install just like any other piston rings. To make it easy, we set up the rings and sets in envelopes and boxes..... * Boxed Sets. Each set contains the right combination of rings for the specified engine. * Individual Envelopes....
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ENGINE - 1098, Initial Tuning (Calver's Corner)
  See bottom for useful part numbers.   The 1098 (1100) engine has had a lot of bad press over the years - largely because of early experiences when trying to tune the motor brought about problems with the then standard components available - they simply were not up to taking any real punishment as experienced in racing. This fallacy was handed down generation to g...
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ENGINE - 998 TUNING, BOLT-ONS (STAGE ONE) (Calver's Corner)
See bottom for useful part numbers Terminology:MSC/MM - Mini Spares Centre/Mini ManiaID            - Inside DiameterOD          - Outside DiameterBBU         - Big Bore Unit (refers to all 1275cc-based units) SBU     ...
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ENGINE - 998 TUNING, FURTHER OPTIONS (Calver's Corner)
See bottom for useful part numbers Terminology: MSC/MM - Mini Spares Centre/Mini Mania BBU - Big Bore Unit (refers to all 1275cc-based units)  SBU - Small Bore Unit (refers to all sub-1275cc units, here the 998) BHP - Brake Horse Power CR - Compression Ratio Following on from the easily bolted on performance enhancing components out-lined in the stage one ...
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Engine - Identification Data UPDATED (Calver's Corner)
  If you have the engine tag still attached to the engine - just in front/below the thermostat housing - or perhaps the original engine number in the log book then the following should help you determine which engine you have. For Metro units, see 'Engine - Metro identification data'.   Original engine identification numbers   850cc 8A      &nbs...
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Engine - Metro engine identification data (Calver's Corner)
 The widespread and prolific fitment of Metro engines into Minis - usually those endowed as standard with small-bore (850/998/1098) engines - practiced in the UK has been spreading to many other countries worldwide. So it's not surprising that the most commonly asked question has also become more prolific concerning the fitment of said engine - apart from actually how to manage the transplant...
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ENGINE - Reliability of the 1380 (Calver's Corner)
  I've been having quite another chuckle lately at some stuff I've seen in print (and heavily and heatedly discussed by internet) on the subject of 1380cc engines and their professed unreliability. I know I have taken pains to explain that you don't have to have a 1380cc with very sporty cam profile and so on to have a decent, satisfyingly quick road car - but this reliability prob...
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Engine - Small-bore engine, 12G940 head fitting (Calver's Corner)
  There is no specific large-bore (1275cc-based) head casting number that will fit the 998 engine any easier than any other. They all have the same problems - generally requiring exhaust valve relief cut-outs machined into the block and re-alignment of the front water gallery transfer ports. However, I would avoid using heads with valves bigger than 35.7mm on the intake since these are ...
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Engine Cost Estimator Mini Cooper (Speciality Stores)
Follow the link below that allows you to set the options in building your dream Mini engine....
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Engine Run-in, MINI (Technical Information)
                           Suggestions for a Successful Engine Run-in . Installing a new rebuilt engine in your car will give it a major “shot in the arm” in any number of ways. In order to get the most of this change we suggest that you take the tim...
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ENGINE TRANSPLANTS - Ancillary parts (Calver's Corner)
Terminology:BBU - Big Bore UnitSBU - Small Bore Unit NOTE: This information covers transplanting large-bore engine units into small-bore engined Minis. For further information for exact differences between pre-A+ and A+ units, see relevant separate article. Engine mountings and steady bars. Engine mountings are a whizz to fit as the Mini ones fit straight onto any of the other units...
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ENGINE TRANSPLANTS - Clutch and flywheel assemblies (Calver's Corner)
Terminology - BBU - Big Bore Units SBU - Small Bore Units   NOTE: This information is largely concerned with transplanting a large-bore engine into a small-bore engined Mini. For further information on clutch and flywheel assemblies in particular, refer to relevant separate article.   To go in to all the possible permutations would take a few chapters on it’s own. Suffice t...
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ENGINE TRANSPLANTS - Engine to gearbox fitment (Calver's Corner)
Contrary to popular mis-guidance, all BBUs (Big Bore Unit -1275cc based engines) will fit all four-syncro gearboxes. It was only the three-syncro boxes that varied in casting dimensions causing hassles where 1275s were applied to 850/998 gearbox casings. The longer throw and bigger crank and rod assembly dimensions fouled the sculpted areas in the gearbox case, necessitating activity with a g...
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ENGINE TRANSPLANTS - initial information and engine choices (Calver's Corner)
Engine transplants - initial information and engine choices. Terminology - BBU - Big Bore Unit SBU - Small Bore Unit Bodge - English term for 'make do' engineering- assured to fail at an in opportune Moment. Dizzy - Distributor NOTE; this information is largely for transplanting large-bore units into small-bore engined cars. Is this familiar? - You take the sm...
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ENGINE- Running in procedure guide (Calver's Corner)
This is another of those subjects that crops up on the message board frequently. I am constantly surprised by the number of engine builders - or people who charge other folk for building engines at any rate - that never hand out such an information sheet. It seems pretty daft to me that having taken a wad of money off of a customer for an engine you've lovingly put together, you'd want to help tha...
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ENIGINE TRANSPLANTS - Changing FDs and speedo drive ratios (Calver's Corner)
Terminology - FD - Final Drive (diff ratio) What they don’t tell you in the manual! If you’ve decided the FD fitted isn’t what you want, changing the FD is possible without separating the engine from the gearbox. Removing the diff case will allow you access to the diff assembly to change the crown-wheel, and access to the gear-change linkage. Use a manual for crown-wheel repla...
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FLYWHEEL & CLUTCH- General information (Calver's Corner)
If there's one subject that gets washed over when transplants or modifications are discussed its the flywheel and clutch assembly. There also seems to be a widely held belief that up-rating an engine from anything other than standard automatically requires a ‘competition clutch’. This, as with many other subjects concerning the Mini, is a myth. May be it’s because the prospective...
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FLYWHEEL & PRESSURE PLATE- Effects of lightening the assembly (Calver's Corner)
How does this affect performance? Not as many folk believe, that’s for sure. For a start, lightweight flywheel/clutch assemblies don’t necessarily give rough running at idle, particularly where a performance cam is used. Nor do they make the engine produce MORE power. BUT they do make a difference to the ACCELERATIVE performance of the car - and that is what we’re most interested...
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FLYWHEEL & PRESSURE PLATE- Technical advances (Calver's Corner)
Great leaps forward in technology since the Mini’s inception have been constantly applied to all forms of automotive applications. The Mini flywheel and pressure plate are no exceptions. If for no other reason than weight reduction - an admirable one considering the effects it can have (see 'Flywheel & Pressure Plate - Effects of lightening' for benefits of lightening).   Two com...
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FLYWHEEL - Pre-Verto types (Calver's Corner)
The early spring-type clutch flywheels are of no use except where total originality is required on a concours car. The taper is too small and diaphragm pressure ring non-existent. No use to man nor beast.   With the exception of the fact the two-piece flywheel is two pieces bolted together - this and the later one-piece cast item can be treated as the same thing. They will universally fi...
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FLYWHEEL - Verto type, injection (Calver's Corner)
The advent of ECU-equipped fuel injection saw the need for a trigger system to provide the ECU with information on engine speed and piston position. In their infinite wisdom, Rover decided to fit a reluctor ring into the rear of the already humungous iron flywheel section. Identical in all aspects to the non-injection flywheel except for this reluctor ring and the raised ridge it is fitted into....
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FLYWHEEL - Verto types (not injection) (Calver's Corner)
There is only one version of this flywheel as standard, and fits all A+, Verto or Valeo (same type, different manufacturer) installations. And it’s heavy. Very heavy. Those up-rating power outputs in later Minis bearing this set-up were stuck with it. It is possible to shave a few ounces off this chunk of iron, but is difficult - especially for the DIY-er - and not cost effective when paying...
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Flywheel Problems (Technical Information)
When installing a flywheel onto a engine/crankshaft I strongly recommend that you "lap the interface surface" between the flywheel and crank. The objective of this process is to insure an absolute perfect fit on the tapper.  If for any reason this is not the case you will probably NOT be able to remove the flywheel at some future date as it will be sure to friction weld the flywheel to the cr...
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Honda B-Series Conversion: MT10000 Installation Instructions (Installation Instructions)
 Click to viewMT10000 Installation Instructions (PDF Format) Honda Engine Conversions to Classic Minis, 1959 - 2001 ...
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Honda K Series Engine Conversion for Classic Mini (Installation Instructions)
 MTK Installation Manual  For Classic Minis 1959 – 2001         Dear Customer,We welcome you to the Honda Powered Mini World. Thank you and Congratulations for your purchase. You can be certain that you have made a wise choice with this upgrade. This kit was designed to help put you on the right track when building your ultimate Mini. With ...
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How To: Engine stand mounting bracket for A series (Technical Information)
Minis, with their A series integrated tranny / oil pan arrangement, are sometimes difficult to bolt to a common engine stand.  Some of the best Mini engine builders use engine stand plates of their own making.  It’s not a common part and these can’t be found easily.  There is one guy in the U.K. on ebay selling them and his are nice, BTW. But with a welder buddy, an onl...
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Induction system - Improvements, initial testers (Calver's Corner)
At the end of every racing season the new/recurrent champions are confirmed, and the rest of the field turning their attention towards next year/season and ways of beating the crowned champ. Invariably this involves that age-old quest for the illusive extra horsepower this year's champion seemed to have over everybody else. So I thought it may be useful to have a...
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Installing a VTEC in a Mini Using the ULTRIK Subframe (Technical Information)
Putting a Honda VTEC engine in a standard roundnose Mini + If you have decided that your Mini needs a more powerful, more reliable engine than the venerable A-series , and have decided that a Honda VTEC engine is the way to go, this swap guide will provide you with some guidance and suggestions to address some of the many challenges and decisions you will face. Any engine swap of thi...
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Installing Mini Main Studs (Technical Information)
Installing Mini Main Studs On 2" inch main 1275 engines the use of main studs gives a solid improvement over the stock bolts. On the 1275 Mini there is something to look out for that doesn't arise on an inline engine. Due to the proximity of the gear box webs at both ends, there is not enough clearance for the nut. There are a couple of ways to deal with this: Leave out the washe...
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Locating a VTEC motor for your mini conversion. (Technical Information)
  Although there are hundreds of sources for good used motors we thought we would simply provide a short list.  We are NOT recommending any one of these guys in particular!     http://www.jspecauto.com/http://www.jaydm.com/jdm.htmhttp://www.asapmotors.com/used-engines-honda-c-1_5.htmlhttp://www.enginereplacement.com/htdocs/honda.htm   vtec.minimania.com...
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Longer Connecting Rods in a Mini Cooper (Technical Information)
Longer rods provide for a longer dwell at piston TDC, keeping the combustion chamber small for a longer period as the expanding gases push against the piston. This extracts more power from a given air/fuel mixture thus increasing combustion efficiency. And so much like with good quench, you've once again raised the amount of compression that you can utilize for a given combination (and octane) bef...
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Lower Engine Stabilizer, MSSK1 (Technical Information)
 FITTING INSTRUCTIONSMSSK1 - LEFT HAND LOWER ENGINE STABILISER KITThis kit is designed to greatly improve engine stability on all Minis, and derivatives utilizing the engine and front subframe assembly from the Mini. It is particularly useful on the later rod - change type gearbox (post 1973 models). Easily determined as reverse is selected by lifting the gear lever rather than th...
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LUBRICATION - Oil pumps (Calver's Corner)
Essential to the well being of every engine is its oil pump and oil. Much in the same way as the heart and blood is deemed relatively important to us humans! It’s also another of those greatly misunderstood and, unfortunately, misrepresented subjects connected to engines.   An alarming number of so-called A-series engine specialists would have you believe that once parting with a ve...
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LUBRICATION - Oil, what it does and how (Calver's Corner)
It’s criminal. Folk spend fortunes putting together super-sonic motors, only to skimp on the oil they use. Why? Oil’s oil right? Wrong. Even if it’s a standard engine, it deserves TLC considering it's extremely hostile working environment.    Oil is literally the engine's life-blood. The opening few sentences are astonishingly true. Oil isn’t there just to pr...
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LUBRICATION - Temperature critical (Calver's Corner)
The correct running temperature of the oil is perhaps even more important than the water/coolant temperatures - so let us consider how to control them. Mainly because it seems to be the most misunderstood of the whole process, and oil cooler fitment almost a reflex when over-heating occurs where a tuned engine of any type is concerned. And in many cases on standard production road cars for that ma...
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MAGDOG3 INSTALLATION INSTRUCTIONS (Technical Information)
INSTALLATION INSTRUCTIONS FOR THE MAGNETIC OIL FILSTRATION UNIT Mini Mania part number MAGDOG3   Installation   Confirm nipple is proper size by screwing it into the new filter and rocking gently.  If it is not properly aligned, contact us for a replacement. Remove the old oil filter ( be sure to dispose of the filter responsibly). Place MagDog on the stud.  Screw i...
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MinComp 1380 (Technical Information)
  As of May 2001, Mini Mania no longer distributes "MinComp 1380" engines. All motors supplied by Mini Mania (including the MinComp 1380) are warranteed by Mini Mania regardless of manufacturer. Mincomp Racing continues to be a favored Mini Mania parts distributor and continues to build and sell engines directly. They can be contacted at (949) 650-3058. ...
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Mini Automatic to Manual Conversion Basic Information (Installation Instructions)
Mini Automatic to Manual ConversionBasic Information (Revised Feb 24, 2010)              The following is an overview of the steps to convert a Mini from an automatic transmission to one with a manual transmission/gearbox. It is not a step by step description of all the possible combinations you may run into, but it gives a good overview...
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Mini Cooper Supercharger Pulley HP Benefits (Technical Information)
One of our customers in Florida found it helpful to have one of our Supercharger Pulley kits installed by professionals. They provided the following Dyno Chart, which typical of the results we and many other customers have found!...
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Mini Engine Performance Enhancement (Technical Information)
Mini Speed Standard Minis have always been slower than their handling was capable of. Fortunately, many people have devoted their careers to making Minis go faster. As a result, you can fit your Mini with a double overhead cam 16 valve cylinder head, a turbocharger, and programmable electronic fuel injection. Fortunately, you need not go that far to extract surprisingly large amounts of p...
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Mini engine stabilizer steady bar, MSSK1300 (Technical Information)
1.This is an auxiliary steady bar kit and should not be used to replace any other standard fitment parts that have broken.2.Remove the radiator support bracket from the radiator and the thermostat housing.3.Slacken the nut retaining the exhaust manifold at the radiator end of the engine. Remove the exhaust manifold stud by tightening another nut against the original manifold nut and then ...
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Mini Harmonic Damper (Technical Information)
Are you familiar with the term ‘torsional vibration’? Well, torsional vibration is simply a periodic vibration which would result from the twisting of an object around its axis. In your Mini engine, this vibration would be expected to originate from the crankshaft as the engine tries to turn it. Excessive torsional vibration, however, is unwanted because it may cause various damages no...
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Mini Mania Crankcase Ventilation Kit, C-2A265 (Technical Information)
Mini Mania Crankcase Ventilation Kit, C-2A265 Read all instructions thoroughly and check parts list before starting installation. GeneralThis kit provides an internally baffled housing which enables the fuel pump port on the engine block to be used to vent the crankcase. The kit also includes fasteners and gaskets to mount the fitting but does not include a hose fitting and hose. The fitting is...
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Motor Oils - It Is So Very Misunderstood (Technical Information)
  By Dr. Ali E. Haas Lets Talk Motor Oil – It is So Very Misunderstood Chapter One - Motor Oil 101 I think it is time to go over passenger car automotive engine oils in detail. I will be writing several articles to be published soon so I will try to get some of it out here. I feel this is a very general topic for all car owners on this board. This is a very difficult topic to compre...
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Motor Oils - It Is So Very Misunderstood - part 2 (Technical Information)
continued from the previous article:   RPM....Pressure..Flow 1,000......40 PSI....2 2,000......80 PSI....4 4,000....160 PSI....8 The maximum flow because of the oil pop off valve at 90 PSI will be 5 8,000... 320 PSI....16 Let us compare a 40 grade oil at operating temperature: The oil is thicker, has more internal resistance and therefore requires more pressure to get the same flow (basel...
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MTD Installation Manual for Classic Minis 1959-2001 (Installation Instructions)
Click to viewMT520000 Installation Manual (PDF Format) MTD Intallation Manual for Classic Minis 1959-2001         Dear Customer, We welcome you to the Honda Powered Mini World. Thank you and congratulations for your purchase. You can be certain that you have made a wise choice with this upgrade. This kit was designed to help put...
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Oil Gallery Plugs (Calver's Corner)
  Here's something unusual that cropped up a little while ago that I've never commented on before - main oil gallery plugs/bungs. I'd been conversing via e-mail with a guy that was experiencing weird oil flow/supply problems with his performance street engine. Initially he'd been blaming it on the supposedly superior oil pump he'd bought. He sent it to me; I inspected it and found it to be ...
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OIL IS KILLING OUR CARS ! (Technical Information)
OIL IS KILLING OUR CARS About a year ago I read about the reduction of zinc dialkyl dithiophosphate (ZDDP) in the oils supplied with API approval that could affect sliding and high pressure (EP) friction in our cars. The reduction of these chemicals in supplied oils was based on the fact that phosphates reduce the effectiveness and eventually damage catalytic converters and introdu...
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Oil Pressure Regulating Kit, HPS4 (Technical Information)
FITTING INSTRUCTIONS This kit includes a new oil galery plug with an adjustable knob and a washer which is used as a spring seat in the plug against the relief spring. This makes a playform for the adjuster bolt to adjust the engine oil pressure. Winding the knob in increases pressure, winding it out reduces the pressure. The standard spring 6K853 is easier to use as its compressed length is short...
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Oil Pump information & part# (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about a decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast road work. Oil pre...
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Piston Fact File (Technical Information)
1275 PistonsOver the years, there have probably been a dozen "stock" 1275 pistons. Currently, three different designs are available from AE/Hepolite as "stock" replacements. All (AE Brand) have an 8.4cc dished top, but compression ratios are carried by changing pin height (Pin height is the distance from the top of the piston to the center of the wrist pin- see dimension "A" shown here). All of t...
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Piston Information (Technical Information)
When Omega quit making A-Series pistons, Mini Spares took it upon themselves to design and build a better Piston.         Recruiting the AE Hepolite Group for their unquestionable and renowned design and manufacturing expertise, the goal was to produce the most robust piston possible given reasonable cost and weight limits. Applying cu...
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Pistons - Mega piston performance report (Calver's Corner)
Pistons - Mega piston performance report The two other articles I have done on this site concerned what pistons are all about, different design and construction pros and cons, material specs, ring set-ups and so on. Under 'Pistons - Favourable features for maximum performance' it would seem that the Mega pistons fit the bill just about spot on for all but perhaps the most extreme of racing engine...
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Project Small Bore, Part 2: Cylinder Head (Technical Information)
Last time we started building a small-bore engine for maximum power. But there is no point having a good engine and putting the wrong head on it. I'm going to use the 12G202 head, as these are the best to modify for our purposes. They are a bit smaller than the 12G295 or 12G206 heads, which gives you a bit more metal to play with when grinding. As far as a standard head goes, you can't go past ...
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Project Small Bore, Part 3: Carb/Manifold Combos Weber (Technical Information)
 Reprinted with permission from www.miniexperience.com.au   Last time we chose a manifold based on flow volumes, and a carbie based on personal choice, but which combination is best on this engine? With the engine finished, it is time to look at a variety of carburettors, inlet manifolds and exhaust extractors, to fnd the most suitable combination. There are a lot of fgures, but they ...
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Project Small Bore: Part 1 (Technical Information)
With 1275 engines getting scarce, a lot has been written lately about modifying small bore engines. Now Graham Russell shares his ideas. We all long for the power and torque available from a 1275cc engine, but with these becoming more expensive and harder to find, we’ll take a look at the alternative of getting some decent power from the smallbore engines. For the price of a good 1275 crank...
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Spark Plugs Overview Classic Mini (Technical Information)
The following article was originally found on the NGK web site. Spark plugs are one of the most misunderstood components of an engine. Numerous questions have surfaced over the years, leaving many people confused. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. The information contained in this guide applies to...
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Starting Our Mini's Engine Rebuild (Restoration)
Starting Our Mini's Rebuild October 1, 2012 Jere Dotten studies the original engine that came with our Mini Cooper S Correct head (below) and wrong head (above) Don Racine of Mini Mania confirmed that this was the proper transmission case  When restoring a car, normally we leave the engine and transmission together while we start on the bodywork. ...
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Steel four bolt main cap set C-AGA621 (Technical Information)
FITTING INSTRUCTIONSThese caps must be line bored and thrust washer faces trued up before use. They are not suitable for ‘S’ blocks. The centre main must be fitted with the ‘F’ stamped in one side facing the front (water pump) end of the block. A secondary check can be made by ensuring the end with the least material between the end bolt hole and main cap end is pointing toward t...
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Steel four bolt main cap, C-AGA619 (Technical Information)
FITTING INSTRUCTIONS This cap has to be line bored and thrush washer faces machined before use. It is uni-directional and must be fitted with the ‘F’ stamped in one side facing towards the front (water pump end) of the block. This can be confirmed by checking that the end with the least material between the outer bolt hole and end of the cap is facing the dipstick side of the block....
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Supercharger kit for the MINI Cooper (Technical Information)
Serious Horsepower for the serious driver! Mini Mania has developed and produced the ultimate in bolt-on performance for the A-Series motor. Modern technology in compressors, modern manufacturing and Mini Mania engineering have resulted in serious performance improvements unheard of in A-Series history. (NOTE_ THIS PRODUCT CURRENTLY NOT AVAILABLE)The supercharger's biggest benefit, torque, is the ...
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SuperCharger Types (Technical Information)
HUFF AND PUFFThe principal requirement to produce power in the internal combustion engine is to combine a precise mixture of clean oxygen and fuel, then igniting this mixture.This ignition leads to a rapid rise in temperature as the mixture burns, pressure increases rapidly and forces the piston down the bore. Hence power is produced.The horsepower and torque output is directly proportional to the...
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Sureflow oil pump C-AEG410 (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast roadwork. Oi...
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Sureflow oil pump C-AEG411 (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast roadwork. Oil pressure ...
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Sureflow oil pump C-AEG412 (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast roadwork. Oi...
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Sureflow oil pump C-AEG413 (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast roadwork. Oil pressure ...
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Sureflow oil pump C-AEG414 (Technical Information)
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly. This has brought about decline in the effectiveness of the pumps, especially in arduous environments such as racing and fast roadwork. Oil pressure ...
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TECH INFORMATION FROM CLEVITE ENGINE PARTS (Technical Information)
TECH INFORMATION FROM CLEVITE ENGINE PARTSTECHCLEVITE®/VICTOR REINZ®/PERFECT CIRCLE® For further information contact:Clevite Engine Parts Division • 1350 Eisenhower Place • Ann Arbor, Michigan 48108-3388 U.S.A.TB-2078 Issued: August 16, 2001ENGINE BEARING FUNDAMENTALS PART 9 “CAMSHAFT BEARINGS”Most of the information published about engine bearings tends to deal with crankshaft bearings. Camshaft ...
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Testing the Engine Out of the Vehicle (Restoration)
Our engine had been rebuilt, our ancillaries completed, and our subframes restored, so we decided to combine all the pieces together to try to run our Mini without attaching the body. We just needed a jump box to simulate the battery and a bit of fuel to pull off. This would also let us know if we’d made any mistakes or had any leaks before we installed the drivetrain into the car. Aft...
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Toothed belt drive for charging system C-AEA536A (Technical Information)
This kit is an ‘add on’ for the C-AEA536 toothed belt water pump drive for the charging system. The large alternator/dynamo pulley is driven from the water pump pulley by a separate belt, thus ensuring the vehicle is still driveable should the charging system belt fail as the water pump will still function. Do not over tighten belt. Correct tension is when you can easily twist the ...
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Torsional vibration damper ring 12A367 (Technical Information)
FITTING INSTRUCTIONS 12A367 TORSIONAL VIBRATION DAMPER RING This is designed to fit either the original type Cooper ‘S’ crank ‘V’ pulley or tooth belt water pump drive pulley. Each pulley should be balanced with its respective crank assembly. It is strongly advised that each component should be balanced individually and check balanced as an assembly. Failure to do this will cause pr...
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Turbo Bearings (Technical Information)
"Turbo" main bearings were designed by Leyland’s engineers to meet a perceived need. It was decided probably by both theoretical calculation and practical test that the turbo Metro engine with its increased bearing loads needed a better bearing, so what they did was remove the oil groove from the bottom bearing shell giving roughly 30% more bearing area. It is claimed that this gives ab...
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Upgrades for Fuel Injected Minis (Technical Information)
    We at Mini Mania have been very satisfied with our experience of being able to help almost any Mini Cooper owners when asked the question ‘How do I make it better’.  With our 30+ years of owning and racing Minis we think we have done almost anything you can imagine. We have built restoration and show cars winning both professional and amateur show events. We hav...
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Upgrading your Fuel Injected Mini! – Part2 (Technical Information)
Our first article focused on the various upgrades that could be carried out on your late model Mini or Mini Cooper but stopped short of talking about horsepower upgrades. (the part 1 article can be found here)   This edition will simply focus on the power unit as found in these late model Mini Coopers. The first of th...
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VTEC Conversion Kit MTB2 Installation Manual (Technical Information)
MTB2 Intallation Manual for Classic Minis 1959-2001 The PDF installation Manual can be Downloaded HERE     Dear Customer, We welcome you to the Honda Powered Mini World. Thank you and Congratulations for your purchase. You can be certain that you have made a wise choice with this upgrade. This kit was designed to help put you on the right track when building your ultimate Mini. Wit...
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VTEC Conversion Kit MTK Intallation Manual (Technical Information)
MTK Intallation Manual for Classic Minis 1959-2001 The PDF installation Manual can be Downloaded HERE     Dear Customer, We welcome you to the Honda Powered Mini World. Thank you and Congratulations for your purchase. You can be certain that you have made a wise choice with this upgrade. This kit was designed to help put you on the right track when building your ultimate Mini. With...
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Water pump tooted belt drive, C-AEA536 (Technical Information)
This system has been designed and developed for use primarily for racing where a positive drive system is demanded to avoid fan belt loss problems caused by out of line pulleys and ill fitting belts. Guide plates on the crank pulley ensures the belt does not wander, no guide plates on the water pump pulley allows ‘self alignment’. The crank pulley is drilled and tapped to take the ...
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