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  1. #1
    SJ-(KY)'s Avatar
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    Max compression on 93 octane with a Ulra 150?

    Having a couple different sets of heads cut an need to know how far I can push the compression with 93 octane? An what I gathered the 99 has the hot ignition,the 02 an up has an in between ignition and the 00 an 01 has the soft ignition in it.. Any recommendations an max compression in each ignition... Sorry for all the questions everyday just trying a bunch of different things in a short period of time... I really appreciate the help..


  2. #2
    jonny5's Avatar
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    Dont know about the other cdi's but compression with a .065ths squish 155psi max for 93 octane...maybe 160 but thats pushing it. I was at 153 on 91 cali gas

  3. #3
    SJ-(KY)'s Avatar
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    This may be one hell of a beginners question but how would I go about measuring the squish? The heads im trying today just have the bottom milled an im showing 130PSI across the board...

  4. #4
    How much are you guys shaving off the heads?

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