compression ratio

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12-26-2005, 02:20 PM

#11

LS1mustang

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Join Date: Dec 2004

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Posts: 101

RE: compression ratio

also dont use platinum plugs.

12-26-2005, 04:10 PM

#12

hardcore91LX

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Join Date: May 2005

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Posts: 240

RE: compression ratio

what is the highest compression I can run on 93 octane with no problems on the street.

12-26-2005, 05:01 PM

#13

silver91gt

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RE: compression ratio

ya, platinum plugs will melt.

12-26-2005, 07:27 PM

#14

JD1969

Pro. B.S. caller outer

Join Date: May 2004

Location: IL

Posts: 9,644

RE: compression ratio

Quote:

ORIGINAL: hardcore91LX

what is the highest compression I can run on 93 octane with no problems on the street.

That really depends on the cam profile and the heads. To be safe you should stay around 10:1 for 93 octane. I would run higher (100 octane) for your spray runs unless you stay around a 75-100 shot.

12-27-2005, 01:18 AM

#15

69mach1377

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Join Date: Aug 2004

Location: ABQ, NM, USA

Posts: 2,593

RE: compression ratio

Correct on the cam influence, and don't forget elevation too. If you think you are borderline, do a compression test. I've heard you should not exceed 180 psi cranking if you want to stick to premium pump gas. This takes into account all factors mentioned above and before.