dgz924s

Any difference in the two intakes/exhaust manifolds? TIA! D

dgz924s

Stupid question? Or did I stump the panel! lol! D

Matt H

Intake P/N is 944.110.052.02 it is an updated (for MY1988) p/n but it appears the same according to PET it looks like it replaced 944.110.051.09 (PET refers to that number as the dropped p/n #, use the one I gave first as replacement).
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

dgz924s

88 must be getting the extra HP from DME then? Thanks D

Matt H

I could have sworn it was a change in CR but I could be wrong, wont be the last time either. :>)
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

Dave951M

I don't think there is a difference in the manifolds. I'd check PET but I'm at work now.

dgz924s

Matt... Now that I think about it you are correct. For some reason I was thinking the intake and/or exhaust was changed. So to get the same HP in an 87 you need to swap head for an 88? D

Matt H

Again, just conjecture but I thought the difference is in the pistons not the head. The head has the same note about the p/n update. It has been a while since I had an NA though.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

dgz924s

Ok...Then the piston head must differ because both are 2.5L. Engine internals are not my forte! Forgive me guys just trying to learn! Thanks D

Matt H

That must be the case here are the numbers from the manual

to 87 - Bore 3.94; stroke 3.11; CR 9.5:1; HP 150
88 (8 valve) - Bore 3.94; Stroke 3.11; CR 10.2:1; HP 160 (158 SAE corrected)

It appears the the "dish" of the piston was reduce in MY1988 in order to raise the CR. The ROW piston is a flat top piston (acording to the pictures in manuals) so that is where I make the assumption of difference. For the 2.7L it was reduced to about a dime from say a 1" diameter depression.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

seb928s

The pistons are different on the 88 then the 87.

Legoland951

Matt is right. The 88 pistons are different and higher compression. I had an 88 motor taken apart and the pistons has a smaller indentation than the earlier years.

dgz924s

Thanks guys!......Dal