to skin a cat (m20 flywheel swap)

[Bunta]

so if you need change the toothed rings or the starter gear, use m20 clutch/flywheel(lightened) and 323tob your made in the shade?

[franz]

this is the first time hearing this
what do you gain by chaning the flywheel to a m20

lighter flywheel is good
but by how much lighter and what is the cost lightening a flywheel

[2002maniac]

this is the first time hearing this
what do you gain by chaning the flywheel to a m20

lighter flywheel is good
but by how much lighter and what is the cost lightening a flywheel

the stock M42 dualmass flywheel is 27lbs
The M20 flywheel can be taken down to 12-15lbs  

I dont know about the cost as I'm doing mine myself.  I would expect it to be under $50

[nickmpower]

when is this going to be running? let me know if you figure out a starter to use. Mine hits the flywheel a tad since im not using the spacer, but i think an m2 one might work. I wont be home for a month so if you figure out something let me know.

[romkasponka]

the stock M42 dualmass flywheel is 27lbs
The M20 flywheel can be taken down to 12-15lbs  

I dont know about the cost as I'm doing mine myself.  I would expect it to be under $50

Will you balance it by your self?

[2002maniac]

when is this going to be running? let me know if you figure out a starter to use. Mine hits the flywheel a tad since im not using the spacer, but i think an m2 one might work. I wont be home for a month so if you figure out something let me know.

stock starter should work with the 42 gear on there.  You can see in my sketch that the location of the gear on the flywheel is the same (1mm difference)

[2002maniac]

Will you balance it by your self?

no, the machine shop that bored my block is going to balance the bottom end with the flywheel and pressure plate installed.

nick,
  it wont be running until my motor is built.  mid-summer probably.

[black318i]

Anyone know how much HP a stock m20 Clutch is good for?

[romkasponka]

Anyone know how much HP a stock m20 Clutch is good for?

there was no problem with 240hp , sachs 325ix kit....

[nickmpower]

stock starter should work with the 42 gear on there.  You can see in my sketch that the location of the gear on the flywheel is the same (1mm difference)

o yeah. The problem i have is that the m20 gear is longer then the m42 gear

[D. Clay]

So:
1) Swap M42 ring onto M20 flywheel
2) Machine .23 to .35 from engine side of M20 flywheel
3) Balance flywheel
Anybody know how closely it needs to be balanced? Could you do a cleanup pass on the lathe and accomplish the balancing?
What 323i TOB is required.

[rob_e30]

I also discovered that if you have the flywheel lightened on the engine side, you dont need to space out the M20 flywheel as described in a few of the writeups.  

Yep, this works and boy was I pleasantly surprised (I had not seen this thread yet)!  M20 flywheel is down to about 12.5lbs and I'm using an M20 starter along with the transmission that was in the car (from a 325i) so no other changes.

[nickmpower]

Yep, this works and boy was I pleasantly surprised (I had not seen this thread yet)!  M20 flywheel is down to about 12.5lbs and I'm using an M20 starter along with the transmission that was in the car (from a 325i) so no other changes.

so is the starter bolted up and you know the pinion doesnt touch the flywheel? if so, sweet

[rob_e30]

so is the starter bolted up and you know the pinion doesnt touch the flywheel? if so, sweet

I was unaware that this was a concern.  I don't recall seeing this as an issue in the threads I read, but I certainly could have missed something.  I thought that the M20 flywheel and M20 starter could be transfered as a set?  I've not bolted up the tranny yet but expect to this week.

Any additional insight is appreciated.

[nickmpower]

well i didnt need to use a spacer with my jb racing flywheel and my m42 starter with m20 pinion hits the flywheel, as the m20 pinion is longer then the m42 pinion. it needs about 1mm more room. if you could tkae a pic of your starter i could probably tell you if it will wok