couple engine related questions

[NC325iC]

hey all
ive been working on swapping out my old m20 for a stroked one
i have a few questions though
-what bolts need to be replaced every use? ie do i need to replace flywheel bolts or tranny to engine bolts etc...
-my m20 has a single mass flywheel and therefore a springcentered clutch, the stroked m20 has a dual mass and a solid center clutch, would i get any benefit from the solid centered clutch, would it work?
i think thatll do it for now, any help would be great thanks alot.

[hamann318is]

Re: couple engine related questions

hey all
ive been working on swapping out my old m20 for a stroked one
i have a few questions though
-what bolts need to be replaced every use? ie do i need to replace flywheel bolts or tranny to engine bolts etc...
-my m20 has a single mass flywheel and therefore a springcentered clutch, the stroked m20 has a dual mass and a solid center clutch, would i get any benefit from the solid centered clutch, would it work?
i think thatll do it for now, any help would be great thanks alot.

Keep the single mass flywheel. The springs on the clutch keep the abuse on the drivetrain down. The light weight is the obvious benefit in that situation.

[rs4pro3]

the flywheel, and pressure plate bolts should be replaced, as long with the nuts that hold the driveshaft and tranny to the guibo and connect the driveshaft to the diff.

[NC325iC]

thanks alot guys, so the bolts that hold the tranny to the engine are good for another go?

[e30Matt]

thanks alot guys, so the bolts that hold the tranny to the engine are good for another go?

Yes, they should be fine.

[NC325iC]

k love the sig btw hilarious

[NC325iC]

so general concensis (cant spell) is that i should use the single mass(duh i was gonna anyway) and the springed clutch.

that would basically be my old setup
and unless it was something else down the line i believe that it has been slipping at high rpms, could that be caused by my rear main seal which i believe was leaking oil

[NC325iC]

bizzump

[arnoldgtr]

unless it was something else down the line i believe that it has been slipping at high rpms

Clutch slip is most likely at maximum torque, not at the highest RPM's.
If you still suspect the clutch has been slipping, you should be able to tell by inspecting the disc. It will be glazed.
The single mass flywheel surface is raised about 1mm where the disc contacts it.
If the flywheel is machined, you MUST have the step remachined in it. Otherwise, the clamping pressure won't be enough.

[erik325i]

Re: couple engine related questions

what bolts need to be replaced every use? ie do i need to replace flywheel bolts or tranny to engine bolts etc...

All of the self locking nuts need to be replaced (driveshaft bolts, exhaust manifold bolts, and any other self locking nuts). I have read that you should replace the flywheel bolts, but I don't see why. I even asked the owner of my local BMW performance shop, and he told me that there is no need to, as long as they are in good condition and use some loctite. The torx bolts that bolt the tranny to the enging should be fine.

[NC325iC]

unless it was something else down the line i believe that it has been slipping at high rpms

Clutch slip is most likely at maximum torque, not at the highest RPM's.
If you still suspect the clutch has been slipping, you should be able to tell by inspecting the disc. It will be glazed.
The single mass flywheel surface is raised about 1mm where the disc contacts it.
If the flywheel is machined, you MUST have the step remachined in it. Otherwise, the clamping pressure won't be enough.

dont understand that last part, i havent had any work done to the flywheel ever i dont think

[kowalski]

every time you seperate the fly wheel your supposed to have it check and if necisary machined.

[NC325iC]

well shit oh well