lower CR on DOHC ZC using PM6 pistons?

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May 30, 2004 | 06:32 AM

90Zcrx

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From: Seattle, WA

lower CR on DOHC ZC using PM6 pistons?

I used the calculator at http://www.knology.net/~jediklc/D.htm and left everything except the pistons stock for a DOHC ZC, for that I put in a6 pistons and came up with a CR of about 8.12:1. I know this is pretty low, but I'd like to boost my zc with oem parts. With these pistons and good management what's a safe psi I can run?

May 30, 2004 | 09:00 AM

y49crxsi

Joined: Feb 2003

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From: Merritt Island, FL, USA

Re: lower CR on DOHC ZC using PM6 pistons? (90Zcrx)

Well, if your going to stick with oem parts, why lower it, the zc has a decent 9.x :1 compression ration, will work fine, run about 8-9 psi to be safe, using turboedit for managment, and 450cc injectors....

May 30, 2004 | 11:24 AM

blah13

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From: Jacksonville, FL, USA

Re: lower CR on DOHC ZC using PM6 pistons? (y49crxsi)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by y49crxsi »</TD></TR><TR><TD CLASS="quote">Well, if your going to stick with oem parts, why lower it, the zc has a decent 9.x :1 compression ration, will work fine, run about 8-9 psi to be safe, using turboedit for managment, and 450cc injectors....</TD></TR></TABLE>

Exactly, the dohc zc's 9.5CR is fine, people boost stock b16's etc with 10.2:1+ CR, its all about how well you tune it. And if you have an sohc zc I believe its CR is 9.2:1....I believe.