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Old 04-02-2003, 09:03 AM
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jamnut jamnut is offline
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People are getting better & better at running High Compressions on street engines with pump gas.

Aluminum Heads make a huge difference in Hi comp engines due to their cooling characteristics. Also the combustion chamber design means alot, it takes some really good head work to clean up all the Hot & cold spots in High Comp Street motors. I've seen 12.5 to 1 engines doing great at the track. On the other end of the spectrum, I've seen 10.5 to 1 engines with great gas in them loosing all power above 4k rpms due to Detonation, because of bad head designs & timing issues.

On fuel injected engines it's much easier to run high compressions due to the OBD1 & OBD2 systems having Knock sensors & computers that are capable of pulling timing (KR) when they sense detonation. Now that OBDII is a standard, people will be able to do some great things with these computers, until they finally get around to locking down the computers so that they can't be accessed.
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