pre 88 RWD 2.8 imbalance weight vs. 3800

[CPOM]

Ok here's a tough one. I am trying to find out if the level of imbalance between a pre 1988 2.8 is the same for a late model L36 3800 both in a rwd camaro application. Meaning, would these two externally balanced flywheels work interchangably provided clutch issues are ignore as well as mounting pattern.

The reason I ask is because I need a .5" thicker flywheel for my 3800 motor swap into my isuzu pickup and I heard the pre 88 camaro 2.8 flywheel is 1.5" thick, and is also externaly balanced. If it has teh same amount of imbalance factored in than I could redrill the mounting pattern and use a 2.8 pressure plate for my swap. I would also need to preserve the orientation of the 2.8 flywheel to match up where the weights are oriented. If anyone knows this obscure info let me know.

thanks
chris

[sharkey]

um, no clue on that. you may be better off hitting up the f-body forums.

why not use a 3800 clutch???

[CPOM]

The 3800 flywheel and pressure plate are spaced in a manner to not allow enough input shaft engagement in my application due to using a toyota trans and a dodge dakota bellhousing. The assembly is just too short so I am looking for a thicker flywheel. I believe the 2.8 flywheel is both externally balanced and .5" thicker than the 3800 flywheel. the clutch itself is toyota. If the balancing were the same it would solve my problems as I could redrill and change pressure plates.

[Naft]

the balancing is definitly not going to be the same, since the internals of a 2.8 and those of a 3800 are entirely different. different crank, rods, pistons, bore, stroke, etc. not a ghost of a chance. you may be able to use the thicker flywheel and get it balanced to the 3800 specs.

if you ask me your getting into a big mess using toyota/dodge/gm parts in the same spot. maybe you should try a ford flywheel lol.

[geoffinbc]

Is there enough meat on the bellhousing to machine off 1/2" somewhere? Maybe 1/4" off the bellhousing to engine surface and another off the bellhousing to tranny surface?

[CPOM]

Naft : The balancing thing I was assuming and I think it is safe to assume there would be no reason why it would be similar specs. I am of course looking for a cheap solution. The combo is the only thing I can run for this motor and trans I want. Nothing is made by the automakers anymore anyway... Aisin Warner built this transmission for jeeps, toys and dodge's.


canadian:
Bell has thin 1/2" flanges with no stiffening ribs. I think it is suspect to modify. I was thinking about milling the front of the trans but diecided against it. I am going to get a spacer milled up to push the flywheel closer and stich weld another ring gear on behind it to engage the starter.