What to use for 8.1 commpresson on turbo Motor
 

I am in the process of rebuild the motor (top end)

it is currently 1984 3.2 turbo @9.5:1

what are my options to achieve 8.1:1 compression

Thank You

If you have good ring seal you could install a different set of cams that would A) Be compatible with a street turbo set-up and B) Bleed off some of your existing cylinder pressure which will have the same effect as reducing the mechanical compression ratio.

PM John (Camgrinder) for advise

How about Mahle 98mm turbo pistons?

Tony,

I am having my cylinders bored and Nikasil plated to match 98 mm JE pistons. I'm not going to go as low in CR as you will, but I believe the JE pistons can be ordered with the CR you want.

I'm building a 3.4 Turbo.

I wanted to do what wydryd was interested in
http://forums.pelicanparts.com/showthread.php?s=&threadid=162481&highlight=Mahle+ 98mm+turbo+pistons

If you mean by boring and replating..that's what I'm doing.

Does anyone have a pic of a JE 98mm piston dome? I was wondering if they do custom compressions AND custom domes for those of us that have twin-plugged our engines.

I had JE make custom pistons for me. You can see a pic at:

http://www.brookstonefarms.com/930rebuild_page2.htm

I am building a motor that has a stroked (964) crank, super 964 cams, custom 98mm pistons and 3.2L cylinders bored out to 98mm (better cooling than the 3.3 cylinders and A LOT cheaper than Mahle).

The compression is 8.0:1 with very little dome on the pistons.

Thanks, Don