Difinitive M20 single mass on any 24-valve swap solution w/ photos

[2.5-12]

so, by now you've hear a lot of things about putting either of the two styles of M20 single mass flywheels on a 24-valve engine.

the thing is, if you just bolt it in you'll end up with something like this:





and that won't work at all.

so, your options are;
1.) machine down flywheel
2.) get two shorter pan bolts and shave down the mount steps

I chose #2 because it takes 5 minutes and was free.



perfect clearance. sawzall and a 4.5" cutoff wheel. did this with the engine in the car, no problem.

hope this helps.

[Zekerbox]

good info. I'm going to keep the singlemass from my early b27 and mate the getrag to my 24v. I didn't realize this would be an issue. I was planning to have a machine shop balance the flywheel, so maybe I will have them trim it down too. I'm surprised I haven't read anything about the single mass wheel causing this.

[justin_l_]

good info. I'm going to keep the singlemass from my early b27 and mate the getrag to my 24v. I didn't realize this would be an issue. I was planning to have a machine shop balance the flywheel, so maybe I will have them trim it down too. I'm surprised I haven't read anything about the single mass wheel causing this.

It's been covered dozens of time. You could also get a 323i flywheel that is already lightened and doesn't have the step on the back.

[mpowerful]

This post was made because of a fb post which is ironic. Two people not researching. Covered in dozens and dozens of threads.

[blazing]

Thanks r the pics,I was planning to have the flywheel shaved if I ever get the motivation to swap my m50 in but now that I see the mod done to the pan I think I will go that rout to save some monies.

[StereoInstaller1]

Good title, good pics, simple explanation.

Yes, it's been covered 1000X, but this needs a sticky in the 24V section.

[Nick_S]

I bet that made a pleasant noise.

[2.5-12]

starter got about half a turn then locked solid. knew something was wrong!

for the record you can also run any old release bearing with a G250/ZF with this setup as well. the Euro 323 bearing is taller so you get bite closer to you on the pedal, but the 260 and 250 bearings will work fine.