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Est. 1974
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Flywheel Steel Street 10.5 Lb Non Verto Mini & Cooper

Flywheel Steel Street 10.5 Lb Non Verto Mini & Cooper

Flywheel Steel Street 10.5 Lb Non Verto Mini & Cooper
Light Weight STEEL flywheel! For non-Verto clutch and non-pre-engaged starter.

"1lb off the flywheel is like taking 100 lbs off the car!" Not quite rational but close. This rule of thumb indicates the importance of flywheel performance. The stock cast iron 1275 flywheel is almost 22 lbs. Even the "S flywheel weighs almost 17lbs. The stock flywheel is "cast" iron and thus not very safe to lighten!

This new "Street" Steel one piece flywheel is 11 lbs. and provides tremendous improvement in acceleration! (The full race version C-AEG619 is 8lbs.)

Effects of lightening rotating engine components:

(0.5 x n2 x r2 + R2) / R2

n = total gear ratio (gear ratio x diff ratio)

r = radius of gyration

R = Radius of wheel/tyre

This formula gives what accelerative weight the engine sees of the car per lb. Radius of gyration of a transverse engine's flywheel is approx. 3.75". So to determine "weight loss" for a flywheel weight of say 18 lb to 10 lb, the engine would see an overall weight loss of the car to accelerate in first gear of:

3.33 = 1st gear of 4 synchro 'S' box 3.44 = diff ratio (0.5 x (3.33 x 3.34)2 x 3.752 + 9.52) / 9.52 = (0.5 x 131.2 x 14.06 + 90.25) / 90.25 = 1012.59 / 90.25 = 11.22 lbs

So for every 1 lb removed from the flywheel, the engine sees 11.22 lbs less to accelerate off of the total car. Therefore by lightening the flywheel by 8 lb, the engine sees a total reduction of the cars accelerative weight of 89.68 lb.

Related Technical Articles:
Flywheel Problems
Created: September 11, 2012
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 t...
FLYWHEEL - Pre-Verto types
Created: November 21, 2000
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 fit all transverse engine cranks from 1964 onwards, so that should be easy enough. If all you can get is the hulking great 1300 type, then this too is as universal to fit, but I highly recommend you get that extra cast lump machined off of the outer edge as a bare minimum.
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