Author Topic: Need: 325i flywheel for M20 swap (Read 4862 times)

otoolb · « **on:** August 09, 2010, 02:03:08 PM »

Hey all,

I am in Seattle, WA and looking for a suitable flywheel for the swap. I'm not too picky. I will take any single mass flywheel for an M20 (325i, 325e, 528e, ...) I really want the 18 lbs flywheel that everyone talks about, but I can make the 24 lbs one work, or even a lightened one.

Thanks

otoolb · « **Reply #1 on:** August 17, 2010, 08:45:42 PM »

Found it!

thebutcher37 · « **Reply #2 on:** August 23, 2010, 03:15:02 AM »

Will a flywheel from a m20b27 325e even work for the conversion?

DesktopDave · « **Reply #3 on:** August 23, 2010, 07:21:04 AM »

I thought all M20's used the same basic flywheel (just with a different tooth pitch pre-88). You'll need the matching starter gear for it to work with an earlier model.

thebutcher37 · « **Reply #4 on:** August 23, 2010, 06:01:18 PM »

Damn.. so theoretically since its off an eta i would have to get the starter off that car then? ... and thats even if it'l fit right?

because i don't want to mess with changing starter gear.
Grrr.. if so looks like im back on the market for a 325i flywheel..

DesktopDave · « **Reply #5 on:** August 23, 2010, 08:06:04 PM »

It's not theoretical at all...the early ring gear teeth are different than the later ones. You can replace that ring, but it's cheaper to get a late model 325is one. You might also look for the Valeo single-mass kit, has all the stuff you'll need. Not sure when they'll release it, but it can't be long.

So I'd suspect you could take any early starter and it'd fit.

thebutcher37 · « **Reply #6 on:** August 24, 2010, 03:57:19 PM »

Cool, just getting another opinion makes me feel better...

i feel like going the 325i route cause i know its been done... we will see!

vpilarry · « **Reply #7 on:** August 24, 2010, 07:40:23 PM »

I haven't run across anyone using the pre-86 325e flywheel. Everyone I've seen uses the 325i or the lighter 323i flywheel (there's one for sale on r3vlimited). Both take the 325i clutch set but you must use the 323i throw-out bearing. You can swap in the whole 325i starter, swap the starter gear or swap the flywheel ring gear. The whole starter is easier, just more $.

redhead · « **Reply #8 on:** September 11, 2010, 11:49:33 PM »

I have the coveted m40 single mass flywheel which is only 1lb heavier than the m20 conversion with all things considered (flywheel, clutch disc & pressure plate). It comes with the matching clutch and the benefit is you can use your existing starter motor - no need to find an m20 starter motor & swap pinion gears and all that jazz. I can also resurface it for you if you would like to put on a new clutch.
Will entertain offers.