highest compression on 89 octane gas

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Apr 19, 2003 | 08:43 PM

SCsol

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highest compression on 89 octane gas

Whats the highest compression you can run on 89 octane gas. The car will be only used for daily driving. So its not going to be reved out all the time. It will be farly stock. But i need to know so I know what head gasket to get... Thanks for your help

Apr 19, 2003 | 08:43 PM

altoid

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From: MD

Re: highest compression on 89 octane gas (SCsol)

9.8:1 i'd say

Apr 19, 2003 | 08:45 PM

SCsol

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Re: highest compression on 89 octane gas (altoid)

so would 10.5 on a normaly driven car be ok? Its not going to be reved out. And the timing will be stock.

Apr 22, 2003 | 05:17 PM

MikeMAN

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Re: highest compression on 89 octane gas (altoid)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by altoid »</TD></TR><TR><TD CLASS="quote">9.8:1 i'd say</TD></TR></TABLE>

don't think i would agree with that. my b16 has a higher compression, and I fill it with 87 all the time

mike

Apr 22, 2003 | 05:37 PM

kb58

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Re: highest compression on 89 octane gas (MikeMAN)

Depends on how extreme the cams are. That is, if they have a lot of overlap, it means they "let out" some of the air/gas being compressed, so you don't get the full compression stroke. So in effect, you get a lower actual compression then what the geometry of the combustion chamber would lead you to think...