Score! Need some spec info...

[Doward]

I'm getting a running 3100 ('96) FOR $150.

Score!

Need to know if the heads are different volume than the earlier FWD aluminum heads. Was the compression ratio changed in the pistons?

What would be my compression ratio, with TGP pistons, and the 3100 heads?

Thanks!

[Guest]

The combustion chamber specs are the same as the 2.8 and 3.1, and even the 3400. The difference in stock static compression ratio comes from the piston pin hight (compression distance). This moves the piston up at TDC, and actually makes the pistons protrude from the block deck at TDC.

[robby1870]

Yeah, so if you used TGP pistons, Im guessing compression will be at or near TGP compression of 8.7:1

[Doward]

Sweet... and those 3100 splayed valve heads should flow better than my stock iron rwd 2.8 heads. Hey, doesn't the 3100 also have roller rockers stock? What ratio? 1.5/1.6?

[Guest]

A '96 3100 will have the 1.6:1 roller fulcrum rockers.

Using "TGP" piston will still give a static compression ratio of 8.9:1, the factory TGP was rated at 8.8:1. This is with a replacement gasket for aluminium heads, that are 0.060" compressed thickness.

[Doward]

OK, so RWD block, 3100 heads, TGP pistons... I'm going to see what the deal is with the 3 vs 2 oil galleys, and see if I can figure out some way of running the roller cam/lifters, too... with a roller timing chain, that should be a free spinning valvetrain, don't you guys think?

Any estimated hp increases over a stock rwd 3.1?

And does the FWD intake flow better than the RWD 2.8/3.1 intake?

[Cliff8928]

I wouldn't run 3.1 T or V pistons with the 3rd gen heads, the 3rd gen pistons are optimized for the head and prove very efficient, and would probably be better than the lower compression older counterparts.. do a search for "Quench" and you should find more info than you'd need...

Cliff Scott
89 BerettaGT
89 Volvo740

[Doward]

I just don't see running any sort of real boost on a high compression (9.6:1) V6. I'll try it all out, and see how it goes.

btw, got the motor last night, and disassembling today!