I am doing a 3.8 swap into my 88 fiero. Now I tried starting the car the other day and it tried turning owe twice which was good. The when i tried the third time it wouldn't do it. Tried many things, and then discovered i couldn't turn over the crank at all. Well i pulled the engine out and took the transmission. Well to my surprise the flex plate was hitting a part in the transmission. I have posted pics so you can see where the contact was. My question I have taken the fly wheel already to be machined down to .840 . I know they didn't machine it down to the specs I gave them. My question is should the fly wheel total .840. Also if the already have taken of some of the fly wheel. what do i do.


So my question is should the total of the fly wheel be .840. or tell me what the total thickness of the flywheel should be.

The flywheel should no be thinker than .840" from the crank surface to the clutch surface. Mine is exactly .840" and still had clearance issues with some pressure plates, until I got the thinnest one I could get, which looks like yours. If I did it over again I would have it machined down to .800" or thinner.

------------------
Turbo 3800 E85 5spd spec5
11.53@126.7

I am using a spec three clutch. So what would u suggest getting it machines down to. To be clear the number u give me should be the YorK thickness of the flywheel. What is yours at right now. What clutch are u using

bump

I'm curious why I haven't read about clearence isues in other threads with different brands of pressure plates. I'm looking to buy one for my swap and now I'm worried.

the flywheel thickness is measured from the crankshaft mounting boss to the surface of the flywheel.

quote Originally posted by darkhorizon: the flywheel thickness is measured from the crankshaft mounting boss to the surface of the flywheel.

The critical dimension is bellhousing flange to clutch surface.
This dimension then could be used to back into the desired flywheel thickness (crank flange to clutch surface). On the last couple of 2.8's I have measured, the bellhousing to clutch surface was 0.830". Most FWD crank flanges are within .065" of the bellhousing flange, and some might even be perfectly flush, but even with a perfectly flush one, a .840" thick flywheel would be .010" deeper into the transmission bellhousing and run a greater risk of rubbing.

On most of my swaps I try to get the clutch surface to be within .810" to .830" to help ensure everything will be rub free.