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Thread: compression ratio

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Dec 2005
    Chelsea, OK

    compression ratio

    How high of compression ratio can u run on alcohol! Say a boosted sbc how high of final comp-ratio can u go on alcohol?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    If you have a good blk and a good rotating assy, plus heads there's almost no limit. 16 to 1 is not uncommon. Alcohol loves compression. Look at it this way, the blown alcohol dragsters and funny cars are running as much as 13 to 1 and running 50% overdrive on the blowers. I was running 13 to 1 with a good 1471 blower in the mid 80's at 40% overdrive. Blowers are better now and parts are better today. Normally asperated probably 15 to 1 would be a good cut off point, and don't forget to reduce the timing, i was running 26* in those days.



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