Mini Mania
Est. 1974
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Complete 1380 Powerunit Engines And Transmission For Mini

Complete 1380 Powerunit Engines And Transmission For Mini

Complete 1380 Powerunit Engines And Transmission For Mini
Big-Bore Power Units from MINI MANIA for the Classic Mini Cooper & Mini Cooper S

The "Ultimate Street Performance Engine" from Mini Mania is the result of 30+ years of building and racing our own Mini Coopers. Because drivability and reliability are of utmost importance in any Mini Cooper, only components from well-established suppliers are utilized to build our Mini motors. While the standard configuration is described here, power-units can be customized to meet your particular needs for your Mini Cooper. Just ask your friendly Mini Mania Sales Technician for a custom power-unit quote.

Engine blocks are cleaned, magnaflux'd, bored and painted. The Mini Cooper cylinder head is a genuine Longman GT6 or one of our special Aluminum heads, which is not only cast ported, but has hardened valve seats for use with unleaded fuels. The Mini motor uses squeeze cast Powermax 73.5mm pistons, which are specifically designed for this application. Elgin supplies the custom ground camshaft, which is driven by a new timing chain and gears.

The cylinder head is set up for use with unleaded fuels. We use Squeeze cast 73.5mm pistons, which are specifically designed for this application. Elgin Cams supplies the custom ground camshaft. (Distributor not included but we recommend the "Aldon" Yellow or a 123)

We sell these engines ready to bolt in and run, which means, of course, that they are already mated with transmissions. These late model rod change transmissions are also fully rebuilt with a 3.44 final drive (upgrade kits to install these in earlier model cars are available at a small added cost) or a remote shift box can be used (extra cost). Flywheel and clutch assemblies are all in place.

Carburation is not supplied but the single 1 3/4" HIF type carb (BDK needle) with K&N air filter on an aluminum manifold is recommended as is Long Center Branch (LCB) exhaust manifold. You also provide you our own electrical bits (starter, generator or alternator), cooling system, tailpipe, and Mini!
Note: No core charge and call us if you are interested in 'trading-in' you old engine!

Non refundable $1,000 deposit required at time of order!


  • 73.5mm squeeze-cast pistons
  • 10:1 Compression
  • 10/10 Crank with Vandervell bearings
  • Elgin Cam003 timined in at 108º for best horsepower
  • Static timed at 5º BTDC
  • .014/.016 Valve lash (Hot)
  • 113 horsepower* at the flywheel at 6500 R.P.M.
  • 102 ft/lbs of torque* at 4700 R.P.M.

* When fitted with the HIF6 carb, LCB, and Aldon distributor

Technical Information:
Engines from Mini Mania
Mini Mania, Inc.

Mini Mania is ready to power your Mini motor dreams! Choose from the Mini motors described below, or add any options to meet your needs. Five-speed transmission, performance camshaft, cylinder head upgrade, hi-lift rockers -- the sky's the limit!
Engine Cost Estimator Tool!

Click on the links below for details and prices on each Mini motor, or call our sales staff to discuss a customized power unit for your Mini.

Go to "" or call 530.478.8300 or email us at

Engine Cost Estimator Tool!
Try it out! Get a quote on your dream engine today!

Our new Engine Cost Estimator tool enables you to choose which parts you want to use to build your engine and then to get an estimated price based on those parts. Simply select the parts required, and then click on the 'Get an estimate on this build now!' button and the total estimated price will be calculated and emailed to you.

"If you can dream it, we can build it!"
1380cc Mini Mania Power Unit
The "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. We sell Mini motors ready to bolt in and run, which means, of course, that they are already mated with transmissions.
Item: 1380 POWERUNIT

1380cc Big Bore Power Unit
Because so many Mini Mania customers ask for built-up high performance Mini motors, we have decided to develop our own "ultimate street engine". After many months of dreaming, planning, stockpiling parts, and testing, our 1380cc "Big Bore" power units are now ready for public consumption!
Item: 1380HP_ENGINE

1293cc Power Unit
This is a rebuilt Mini motor engine assembly from Mini Mania. Both the Mini Motor engine and transmission have been rebuilt with our vast experience to insure the right combination of economy and performance; you get good performance at an economical price! Our Mini Motor is built for unleaded gas, the engine should produce between 65 and 75 horsepower (comparable to original Cooper "S").
Item: 1275_POWERUNIT

1293cc Power Unit
With an estimated 100 horsepower on tap from this engine this great package is ready to install and will absolutely thrill you. The rebored 1275cc motor includes high compression (9.75:1) performance pistons, an Aluminum cylinder head and a fast road camshaft (276 degrees duration). This set up will provide the ultimate in performance with great reliability!
Item: 1275HP_ENGINE
1380HP ULTIMATE Engine - with 1.5 rockers, Duplex Chain, Lightweight Flywheel
This starts with our 1380HP engine package and adds three of our most popular upgrades!
Package Includes:
  • 1380HP engine package 1380HP_ENGINE
  • 1.5 roller rocker set C-AHT436
  • Duplex timing chain set C-AJJ3325
  • Lightened flywheel C-AEG420

Item: 1380HP_ENG_ULT
Used & Tested 1300 A+ Engine & Transmission
These pre-owned units have been taken out of cars in the UK and are tested by Mini Mania for compression, oil pressure and blow-by. The assembly includes everything from cylinder head to clutch and transmission, and can esily be fitted to all Minis from 1959 forward. These units are ready to bolt in; some minor modifications might be needed depending on your exact configuration.
1380 Shortblock
Big bore block, crank, rods and pistons. 1380 assembled shortblock consists of A-Plus block and crank machined to 73.5mm and assembled with pistons, rod bolts, bearings, and our special camshaft. We've done the hard work, you can do the final assembly with your favorite head,transmission, and ancilleries.
1380cc DIY Kit
Ideal kit for the Do-It-yourself engine builder. Special kit includes AE big bore pistons, our special 1380cc camshaft and lifters, +.020 main & rod bearings and the HIF44 needle that is ideal for the 1380cc engine!
Item: MMKT1380
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