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DIY Classic Mini Fuel System Articles

Keep Your Engine Properly Tuned for Better Fuel Economy (Technical Information)
Keep Your Mini Cooper Engine Properly Tuned Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4 percent, though results vary based on the kind of repair and how well it is done.  Fixing a serious maintenance problem, such as a faulty oxygen sensor, can improve your mileage by as much as 40 percent.   Fuel Economy Benefit: 4% Equivalent Gasoline Savings: $0.13/gallon     Check & Replace Air Filters Regularly Replacing a clogged air filter can improve your car's gas mileage by as much as 10 percent. Your car's air filter keeps impurities from damaging the inside of your engine. Not only will replacing a dirty air filter save gas, it will protect your engine...
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A Basic Guide to Electronic Fuel Injection for Minis (Technical Information)
A Basic Guide to Electronic Fuel Injectionfor Minis By Cameron Otway   http://www.hotbricks.org.au/     Disclaimer: This article is intended as a basic guide to converting a Mini to EFI only. It's sole purpose is to provide basic information about EFI conversions. Seek professional advice before considering converting your vehicle to EFI. If you have any comments, suggest...
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Air filtration - K&N Air cleaner test (Calver's Corner)
  In the past few years (well, must be nearly 6 years by now!) since I got involved with writing for the specialist Mini Magazines, I have been continually fighting with the problem of limited space. This has limited what I have been able to cover, both in subjects and in details. Up until recently (say the past year or so) I have been covering fairly ...
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C-AHT770 & C-AHT770A FITTING INSTRUCTIONS (Installation Instructions)
Inlet manifold informationThese single SU carb manifolds were developed to provide optimum airflow and air speed for the vast majority of road-used cars. The development program saw a significant increase in efficiency following production to the point where they are the best 'off the shelf' manifolds on the market for a majority of applications, including motorsport where only a single SU...
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C-STN17 Stage One fitting instructions (Installation Instructions)
Although the 998/1300 stage one kits are bolt on parts easily fitted by any person with mechanical knowledge, the following must be understood. 1) The engine will require adjustment/tuning after fitment and specialist equipment or knowledge is required. It is advisable to have the car set up on a rolling road and ensure exhaust emissions are correct. 2) The kit is not recommended for vehicles with...
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Carb Rebuild (Restoration)
While waiting to get a block of time to dive back into the metalwork, we did some light bench work and rebuilt the original 1.25-inch SU carbs. Overall, the carbs were in good shape, and we had a few extras that we’d collected. The main thing to look out for in a carb rebuild is worn throttle shafts. These can be rebushed. Fortunately, ours were in decent shape.   ...
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Carburation - Initial Considerations and Manifolds (Calver's Corner)
See bottom for useful part numbers. When trying to improve your Mini’s breathing efficiency, carburation and inlet manifolds are open to as much speculation as other ‘performance enhancing’ components. A great deal of which falls into the b*llsh*t category. As is my wont, I’ll try and outline some basic guidelines. Many facets of our lives are governed by one particular i...
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Carburation and Interchanges (Technical Information)
Weekley News from the Mini Mania Engine department Carburation and Interchanges What is the correct carburation that you should use on a Mini?  The answer will depend on what size engine you have and what you are trying to achieve. Over the years, the factory used the SU type of carburation on the Mini. They used a wide range from the single 1.25" to the 1.75" to a duel set up. It is possib...
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Carburetors Installation of HIF-6 or HIF-44 Carburetors (Technical Information)
  General Guidelines for Installation of HIF-6 or HIF-44 Carburetors These guidelines make several assumptions, among which are: 1) You own a workshop manual covering the SU HIF-series carburetors. A number of good-quality manuals dedicated to the SU are available and are highly recommended. It is strongly recommended that you understand the theory of operation and the mechanical layout of...
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Carburetors: Conversion from Injection to Carburetors (Technical Information)
Carburetors: Conversion from Injection to Carburetors Single Point Injection to Carb Conversion IMPORTANT NOTE: This change should be considered a significant deviation from stock and thus should only be undertaken by a competent mechanic.In the history of the Mini the drive to keep the product alive and marketable meant the factory decided to modernize the fuel system of the Mini from Carb to Fu...
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FUEL - Leaded/unleaded fuel and the alternatives. (Calver's Corner)
The fuel situation seems to be worsening at a great pace these days. And as is exhibited by the questions that appear on the message board many folk are confused by what they can and can’t do, and what is best to do as far as race engines go. Many have posted (particularly from the States) that nothing need be done - just run on unleaded. They've been doing this for years and never had any p...
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FUEL SYSTEMS - The History of SU Carbs (Calver's Corner)
  Practically every Mini owner can name the brilliant engineer responsible for our obsession. Many can name the man responsible for the rubber suspension spring. A goodly number know a fair bit about the engine's heritage and the man who came up with the extremely efficient cylinder head design. They account for the biggest chunks of the Mini's anatomy. But what about that other extremely si...
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How Colortune Works (Technical Information)
Understanding the principle by which COLORTUNE works helps in getting the best out of it.  That principle is commonly seen in action or paraffin heaters, gas cookers, or anywhere where a fuel is burnt in air to produce heat or energy.  Combustion at its most efficient produces a clear blue flame, various other colors result from inefficient mixtures. Inside an internal combustion en...
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How to Improve your Mini MPG (Technical Information)
How to Improve your Mini MPG When was the last time you checked your gas mileage?  Checking the gas mileage in many modern cars is a simply matter of pressing a button the one dash and reading the number.  The problem with these later cars is that it is difficult to change it much with adjustment or upgrades.  We have the opposite problem with our early cars, it is easy to ...
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Injection - Tuning up-date Mar. 2003 (Calver's Corner)
       Previous article in this series:Injection Tuning - Basic Information (5/02)Injection Cars - Tuning Update (12/02)   Late again - I know. But there were pressing problems and I wanted to clear something up about another company's claims I alluded to in my last up-date. The very astute of you will also have noticed...
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Injection - Tuning Update 03.14.03 (Calver's Corner)
       Previous article in this series:Injection Tuning - Basic Information (5/02)Injection Cars - Tuning Update (12/02)Injection - Tuning Update Mar. 2003 (3/03)      This program of development embarked upon by myself and colleague Mike Barratt (MBE, Lincoln 01522 545189) was instigated by Keith Dodd, owner o...
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Injection cars - SPi-TPi tuning, basic information (Calver's Corner)
  Injection cars - SPi-TPi tuning, basic information   I've been getting a lot - well even more than normal - of questions concerning tuning the injection engined-cars of late as more and more folk are looking to tune their modern Minis. Many are frustrated by the lack of product availability to achieve what they want, some are experiencing problems with the standard ECU and othe...
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Injection Cars - Tuning up-date (Calver's Corner)
  It has been a long time between my first few words on basic injection car tuning and these - for that I apologise, but business has been unbelievably fraught this year. I did promise regular and frequent up-dates, but the best laid plans, and all that… As I said, business has been more than brisk.   OK, so what's happened to the Min Tec/Mini Spares development program? A...
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Inlet Manifolds (Technical Information)
Inlet Manifolds Recent development has recently encompassed a detailed look at the manifolds available for side draught carbs. The steel inlet manifolds available have long been acclaimed the very best, out-performing all the alloy types by far. After flow-testing a number of randomly picked steel manifolds, the results showed that as a rule they did not meet their expectations and varied - cons...
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Mini Cooper Air Filter Technology (Technical Information)
  Mini Cooper High Performance Air Filters Facts Open cell industrial grade filter foam represents the latest advance in air filtration technology. This section describes how and why it works so well when compared to the other three types also in common use. An optimum air filtering system is very inexpensive insurance against untimely replacement of rings, valves, bearings, and ...
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Needle codes for SU carbs (Technical Information)
  Needle codes for SU carbs           Here are a selection of needles codes and the vehicle specs that they were used in...           EB     -    850cc and rebores, 920cc, 1.25SU, 9:1 CR          ADE    -&nb...
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SU CARBS - Connection, HIF type (Calver's Corner)
Although there are a number of different versions of the HIF type carb, they all essentially share the same type of connection layout. The diagram below depicts the most common type - the connections can be on either the right hand side (as illustrated below) or the left hand side. Some have the connections shared on either side. Whichever, the port functions are the same. It isn't essential the ...
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SU CARBS - Dashpot oil. (Calver's Corner)
This subject is a regular message-board poser. Many of us have touted our preferences and discoveries whilst playing about over the years. One problem with trying to deal with it on the message board is the sheer volume of information offered and available against the time available to post it. Personally I try to keep my answers as short and informative as possible. Apart from the fact it costs a...
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SU Carbs - HIF, a more finely honed instrument. (Calver's Corner)
SU Carbs - HIF, a more finely honed instrument. The basic SU design has maintained the same basic format since it's inception. Even it's external appearance remained unchanged until the late seventies, early eighties - the classic illustration of a basic and simple concept that was very hard to improve on. Modern technology continually sweeps its ever-growing arm across all manufactured products ...
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SU Carbs - Quick reference needle selection (Calver's Corner)
Unfortunately I cannot give an all-encompassing table of what needles are needed for which engine builds. My life's collection of all the automotive-orientated work I'd ever done was stolen out of my car by some low-life scum a few years back. Not for what it was - but for what it might be. All I have is a few scribbled notes, the source of where I start now. Being an oft-voiced question on the ...
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SU CARBURETTORS - How They Work (Calver's Corner)
SU CARBURETTORS - How They Work   Basic knowledge   Even though the SU carburetter (carb) is a very basic yet precise instrument, some fundamental understanding on just how it works is needed to be able to deal with common problems and tuning. Following is as basic a description of what's going on that I can manage! First you need to be comfortable with the main aim of any c...
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SU Fuel pump, FUL117 (Technical Information)
                                        Polarity Resolution Notes                       &nbs...
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SU HIF44 & HIF6 Vac pipe take-off (Calver's Corner,Technical Information)
On some HIF carbs, the vac take-off located just after the butterfly - that's between the butterfly and the carb to manifold mounting flange - has been eliminated. Instead, the engines these carbs are fitted to use a vac take off in the manifold. The reason for this is again wholly idle emissions orientated. The higher vacuum that exists in the manifold area can be used to pull more ignition...
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Synchronization of Twin SU HS-type Carburetors (Technical Information)
                           Synchronization of Twin SU HS-type Carburetors General Before proceeding to synchronize your carburetors and for best results, some preparation is in order. Your carburetors should be in peak condition with no play in the throttle shaft...
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Tuning your WEBER DCOE-Style Carburetor (Technical Information)
Tuning your WEBER DCOE-Style Carburetor So you have a nifty Weber DCOE or S&K Racing sidedraft carb setup foryour vehicle. You're ready to chew gum and kick butt, and you've run outof gum. You bolted on the carb in place of your SUs or Zenith-Strombergand voila! You have worse gas mileage, and the power gain is slight enough to be psychological. What to do? First, you must decide your target...
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Weber carb information and part no. (Technical Information)
One of the common problems where sidedraft carbs are involved is the choice of carb size in the first place and choke size in the second. The trick with carb sizing and choke selection is basically one of choosing a size which provides the engine with the airflow it needs without going over the top. Although carb selection should really be done only after you know the flow characteristics of you...
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Weber Carburetors Float Level - DGV / DCOE (Technical Information)
The float level is a critical part of carburetor calibration. Changing the fuel level in the bowl will change the point that the main circuit starts to feed, alter the characteristics of an emulsion tube, and affect drivability and fuel consumption.GENERAL INSTRUCTIONS: Float level, in mm, typically refers to the distance from the face of the carburetor top cover to the float. With the top cover h...
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WTCC Carburetor (Technical Information)
  1.  Engine crankcase breather. 2.  Manifold vacuum source to be connected to de-accel. shut-off device item 5. 3.  Distributor vacuum advance source (spark port). 4.  EGR vacuum source. 5.  De-accel. shut-off device (diaphragm) vacuum connection (connects to item 2). 6.  Idle Mixture screw. 7.  Idle speed screw.  ...
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