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Thread: whats the most pump gas compression possible

  1. #1
    Junior Member APPRENTICE
    Join Date
    Aug 2003

    whats the most pump gas compression possible

    any experiences on whats the most compression possible with 93 octane pump gas using aluminum heads bbc? the cam size needs to be mentioned also,in case the cam is bleeding off the compression.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Feb 2004
    san antonio, texas
    its best to call a piston company and tell them what heads and
    CC you are going to use and they can tell you what comp to use
    for high octane pump gas, i was told not to go over 10.25:1
    but the old 396 was running a 11.00: 1 comp due to its rod length,
    but at that time the ethyl was premium 8) good luck

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    true cam timing has to do with compression does rod to stroke as well as air inlet temps,and how used(heavy pulling truck at low rpms and stabbing the throttle is an example of this)

    the larger the cubes the less room to play with example a 396 will tolerate maybe 11 to one where as a 632 might only be 10:1....its all about cylinder pressure which i think someone might chime in for idont know max cylinder pressure u can safely get away with...

    what is your combo and application?

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