Mini Mania
Est. 1974

Build Your Dream Engine

Build you own engineMini Mania offers a number of already designed and developed complete custom powerunits. The various existing options for 1275cc and 1380cc units can be found here!

Our Engine Cost Estimator tool enables you to choose which parts you want to use to build your custom 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.

The base 1275cc powerunit as available here is described as following:

This is a rebuilt Mini motor engine assembly from Mini Mania.  Both the Mini 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").  The transmission is the rod change linkage type that uses inboard CV joints & 3.44:1 final drive ratio.(Special order units with the older remote shift and yoke outputs are also available!) Clutch, flywheel and all covers are in place; it's ready to run! This powerunit is built to accept your existing intake/exhaust, cooling and electrical systems.

Bore size will be <= +.040", 8.8:1 compression, new Water Pump
Cast Iron cylinder head, stock valves and 1.25 ratio rockers
Cast Iron Verto flywheel with stock clutch
Street camshaft with standard lifters
Simplex timing chain with tensioner
Rod Change gearbox with 3.44:1 final drive

Please select from below to receive an estimate for your custom designed powerunit:

Engine Bore size :
Cylinder Head:
Rocker Assembly Type:
Camshaft Selection information can be found Here
Camshaft Selection:
Camshaft Drive Selection:
Note- "rod change gearbox" can be fitted to pre 1972 cars with addition of MMKT0803
Gearbox Shifter Type:
Final Drive ratio:
Exhaust manifold/header:
Interia type ring gear - can be used with or without pre-engaged starter- can be used on all models not fuel injected
Flywheel Selection (Non-verto):
Clutch Disc:
Clutch Pressure Plate:
Verto Flywheel as used on '84 and later:
First Name:
Last Name:
E-mail Address:
Confirm E-mail Address:
Phone Nunmber:
When do you expect to purchase a Power unit:
Where do you live:
Type What you See Above: