CP Forged pistons

diabolos88 · August 14th, 2005, 05:26 PM

are these too much compression for TT setup?

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEMM%3AIID

Am going to run naturally aspirated with these hi compression forged pistions til I save up the extra dough for a TT this winter, I won't be driving her in the snow anyways. But was curious if there's a way to keep these 11.5-to-1 ratio pistons with the TT setup? I'll be doing set of Greg Good heads in a week or so. I want to know if it's possible to lower the compression via the heads in order to compensate for these hi comp pistons so that I don't have to switch out to a lower comp piston later for the TT setup.

Torquemonster · August 14th, 2005, 06:36 PM

can you say

BANG!

In a word - NO.

There is a way to run that high compresion and TT but the cost of such an engine forbids buying pistons on ebay - you'd have everything built for it from the ground up, and few would even know where to start.

the only fixes if you insist on keeping those pistons are these:

1 - have a custom head gasket made to lower compression down to what your tuner will suggest.
2 - or remove pistons and have the domes machined off then the gasket thickness selected to finalize compression to required.

neither options appeal to me at all and I am assuming there is enough meat under the dome to take them off - they may be forged lightweight and will not allow that.

set those babies at a 0.035" quench clearance and enjoy a crisp n/a engine. If you go TT - I'd be pricing up new pistons if I were you.

DynoDaddy · August 14th, 2005, 06:36 PM

11.5: 1 is too high for any type of forced induction on these pushrod engines. Consider lowering it to 9:1.

diabolos88 · August 14th, 2005, 06:45 PM

ok, I guess I'll run these for now, til winter time when I'll put her up in the shop for the TT. Which pistons should I pick up for the TT? JE forged 8-to-1?

**kungfool** · August 14th, 2005, 06:48 PM

Vai o asshole da foda você mesmo de proportions magnifecent.

JID · August 14th, 2005, 06:56 PM

I have a set of 9:1 pistons w/ rods you can have (ross 400 series) cheap! If you want them...

13cc dish. slightly used. Good condition.

JD

diabolos88 · August 14th, 2005, 07:28 PM

Quote:

Originally Posted by foolie

Vai o asshole da foda você mesmo de proportions magnifecent.

e ai?? vc tem problema?