I know you can put a 325i flywheel onto an M42 engine with the use of a 323 pilot bearing, 325 clutch, and 325 pinion gear in your starter (thank you Stu). What I want to know is if I wanted to utilize the stock M42 flywheel how light could I get it? And how much does the stock flywheel weigh?
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Last edited by ///M42 sport; 04-30-2011, 05:09 PM.Renting my rear wheel bearing tool kit. SIR
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ARe you sure the 325i flywheel is 11lpbs, as in 11 pounds???
BTW, I have a single mass flywheel from a M40 (SOHC 8v) engine and it lightened. Estimated 1kg of metal shaved off the flywheel.
FYI, I replaced my M40 engine with the M42 from an E36 but retained my gearbox and flywheel.BMWClub Malaysia
www.bmwclubmalaysia.com
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From analysing the BMW ETK, I have found out that '89 models were fitted with the M40 9.973kg flywheel but were changed to a 11.45kg (aircon) or 12.25kg (no aircon) from 1990! So there's about 2.5kg saving to be had at a fraction of the cost of a performance part ! BTW, M20 engines have a 8.5kg or 9.98kg flywheel but will not match the M42 starter motor teeth, nor pressure plate, nor gearbox input shaft...and, if you fitted a M20 pressure plate you would be ~0.5kg up again (M40/M42=1.26kg, M20=1.674kg).
Andrew AT E30zone.co.uk | H23-is | S14
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I weighed my lightened flywheel the other day and it's 7.7kg (~16.9 lbs)..
It's a stock M40 single mass fly wheel lightened about 2 years ago but I didn't get to weigh it before it went back onto the car..BMWClub Malaysia
www.bmwclubmalaysia.com
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