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Thread: octane question 93 what compression ratio will it work with

  1. #1
    Senior Member DYNO OPERATOR bixblk's Avatar
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    octane question 93 what compression ratio will it work with

    I am in the process of getting the compression ratio, but let me ask you guys this question
    alum headed 396 .040 roller motor with today,s gas 93 octane what type of compression ratio will 93 octane support. I am selling the car and do not know the exact compression ratio yet and the potential buyer is interested to know and so am I.
    Any tips of figuring out the ratio ?
    thanks jeff m
    708-308-0282

  2. #2
    Senior Member DYNO OPERATOR
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    11 to 1

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    Senior Member EXPERT BUILDER
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    depending on the heads aluminum allow .5 to 1 more on pump gas

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    Senior Member EXPERT BUILDER
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    Quote Originally Posted by ajk
    11 to 1
    X2

  5. #5
    Senior Member RACING JUNKIE curtisreed's Avatar
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    11-1 is definitely doable but your cam selection is critical at the compression and using 93 octane. Dynamic compression can run up higher than static compression depending on overlap, duration, etc... Quench is another area that can alter how much compression you can run on that octane.

    Curtis

  6. #6
    Senior Member DYNO OPERATOR bixblk's Avatar
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    octane

    I knew I would get legit responses, I was sorta in that range of 11 to 1, now I need to get the compression figured out. Is measuring cyclinder pressure a fair way/decent start. How can we tell compression if we do not know the components and milling etc. CC size etc. Thanks for the info
    Jeff 708-308-0282

  7. #7
    Senior Member RACING JUNKIE
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    READ THIS THREAD FOR ENTERTAINMENT ONLY http://forums.racingjunk.com/viewtop...+ratio&start=0
    MIKE

  8. #8
    Senior Member RACING JUNKIE
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    Also depends on what temp climate you are going to be driving in as well

  9. #9
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Not to go off in a different direction, BUT, there's a BUNCH of names on that thread that I've not seen/heard from in MONTHS :shock: :shock: :shock: :shock:
    DragsterJosh - Tod74 - Suicide -Topspeed - radicalz - Maniac - JimmySmith - Beast.........and of course Rudy.....
    TRUTH is HATE
    to those who
    HATE TRUTH

    God Bless our folks in uniform
    "We the People, have your backs"
    http://www.racingjunk.com/profile/279898

  10. #10
    Senior Member RACING JUNKIE
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    X2 ... It just isn't the same these days.
    MIKE


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