195 PSI 10.3 to 1 compression on street fuel - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-07-2010, 06:23 AM
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195 PSI 10.3 to 1 compression on street fuel

Hey! what are your thoughts on running a motor on pump super with 195 psi compression and 10.3 to 1 ratio?

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Old 08-07-2010, 07:58 AM
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depends what engine and heads and load. what engine are you talking about? What car? do you plan to pull a trailer? what gear and trans?

If it is a 454 with stock iron heads then I would say no.

if it is a 350 with flat tops and vortec iron or aluminum heads then I would say, no problem with 93 octane.

If it is a 1100cc honda then it would be ok too.

some of things that effect octane requirement are flame speed, piston diameter, head material, head chamber design, and others.......

10.3:1 cr with 195psi of cranking pressure means the cam is fairly mild.

would require 93 octane in most cases.
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Old 08-07-2010, 11:21 AM
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If its a dohc pent roof chamber then you could probably run 87 octane as a lot of oem's recomend that.

Need more details.
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