Author Topic: DIY M20 flywheel conversion (Read 125449 times)

jfdublyu · « **on:** April 23, 2006, 08:17:42 PM »

Whatsup guys? I was checking out the Blackforest Industries Site (formerly Lowen Design) and was looking in their tech articles and found a DIY for the M20 flywheel conversion. It's a very good write-up with part numbers of required items and a lot of pics. here's the link: http://www.blackforestindustries.com/m20flywheel.htm

2002maniac · « **Reply #1 on:** April 23, 2006, 08:38:15 PM »

very nice write up! They have the same PN listed for the TO bearing and starter pinion though.

nickmpower · « **Reply #2 on:** April 24, 2006, 12:39:33 AM »

its the TO bearing

http://realoem.com/bmw/partxref.do?part=21+51+1+204+525&showus=on&showeur=on

M42boy · « **Reply #3 on:** April 25, 2006, 11:23:29 AM »

Quote from: 2002maniac

very nice write up! They have the same PN listed for the TO bearing and starter pinion though.

Yes, that's the same article that everyone just reposts from 1998. Is there nothing newer with pics? And, yeah, I noticed the wrong part number too. You'd think someone would have fixed that along the way, but like I said, everyone's just reposting the same old crap. :mad:

I may work on updating this as I'll be putting in an M20 flywheel in my M42 over the next few weeks. I'll try to at least take some pics.

jfdublyu · « **Reply #4 on:** April 25, 2006, 07:39:11 PM »

i'm not worried about the quality. I gave in and bought the JB Racing 9lb. aluminum flywheel from TMS. But to my good fortune they charged me for the cheaper 323i flywheel and sent me the wrong one. Wait, how is this good, you ask? Well i told them they sent me the wrong one and they are now sending me the right one next day air and not charging me extra difference of the higher cost for the one I wanted (the m42). so long and short of it, I got the 9lb LWFL shipped in two days from order for $488, when it should have been around $600! It's going in tomorrow and will be ready by friday.

jbuttenshaw · « **Reply #5 on:** May 03, 2006, 05:17:22 AM »

are all m20 flywheels the same weight?

M42boy · « **Reply #6 on:** May 03, 2006, 10:36:38 PM »

Quote from: jbuttenshaw

are all m20 flywheels the same weight?

They are "roughly" 16 lbs. All will be the same when new, but age and how much you mill it down will alter the weight. I just simply had mine resurfaced and cleaned it a little.

nickmpower · « **Reply #7 on:** May 09, 2006, 11:30:16 PM »

damn, has anyone fround a good source for the TO bearing? its listed for $67 on BMA!!!

doigal · « **Reply #8 on:** May 20, 2006, 02:37:15 AM »

and does anyone have the actual part numbers for the flywheel and the rest? Thinking that i'll be doing this when i shoehorn an m42 in..

bmwman91 · « **Reply #9 on:** May 20, 2006, 03:43:10 AM »

Quote from: nickmpower

damn, has anyone fround a good source for the TO bearing? its listed for $67 on BMA!!!

You will, unfortunately, just have to suck it up. I paid $50 for mine about 2 years ago. I was calling around and one dealer, after checking his system, said that there were only like 9 or 16 units left in the entire US (within the dealer system). Could explain the price.

KidneyBoy · « **Reply #10 on:** May 20, 2006, 09:46:46 PM »

http://www.autohausaz.com for the pinion and TOB. Pinion was 9 bucks, TOB was 56, i think

Not all flywheels are singles mass! Only the 88 to 91 325i/is models had single mass. Drops to 12lbs from 23lbs, and a HUGE improvement. Makes downshifting to second in the wet fun :smile:

doigal · « **Reply #11 on:** May 31, 2006, 05:23:48 AM »

I went down to a parts house here in melbourne today and got what i think are the part numbers for everything - these should be confirmed first though!

323i release bearing # 21 51 1 204 525
M20 Clutch Disc # 21 21 1 223 643
M20 Pressure Plate # 21 21 1 225 852
325i Single mass fly # 11 22 1 716 276
325i starter pinion gear # 12 41 1 268 370

hope thats of help...

M42boy · « **Reply #12 on:** June 05, 2006, 05:20:56 PM »

I'm selling a complete M20 flywheel/clutch conversion kit. All same part numbers listed above.

I could not make it work in my car. I'm putting in an M42 dual mass. Maybe whoever buys it can do a halfway decent writeup with pics for the benefit of the rest of thier E30 bretheren... It seems my begging, groveling, countless phone calls, etc... all led to Nowhere. If so many people have done this conversion, how come there is so little information available? LACK OF INFORMATION SUCKS!!!

This is a pretty specific project and if your're spacing is off my 1-2mm, the thing is hosed. No one's mic'ed it, and given specifics. I could probably figure it out with more expertise, time and/or money, but I'm spent and too busy to deal with it. I just need my car back on the road asap!

Whoever wants to try it, contact me via PM. I've got all the parts you need.

asubimmer · « **Reply #13 on:** June 05, 2006, 06:52:13 PM »

YGPM M42boy

doigal · « **Reply #14 on:** June 05, 2006, 08:38:01 PM »

M42boy - were they all the same P# as the ones i listed? and where abouts did you become undone?