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Thread: Max Compression Ratio in STU....

  1. #1
    Join Date
    Aug 2005
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    Default Max Compression Ratio in STU....

    Am I going crazy, or will the maximum compression ratio be bumped up a 1/2 point next year to 12.5:1? I though I read it in a fastrack, but now I can't find it.

    I ordered a set of 12.5:1 pistons, but can add 0.030" to the head gasket and drop it that 0.5 point. I need to know so that I can order the correct head gasket.
    Thanks,

  2. #2
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    Mar 2001
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    Nope, no plans to change compression ratio...don't know where you saw that. - GA
    Not my circus...not my monkeys...

  3. #3
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    Aug 2005
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    Thanks Greg,

    I'll get the thicker head gasket. That's crazy because, E-production has the exact same compression ratio and cam limits, the only differences are h-beam rods and dry sump oil system.

  4. #4
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    Quote Originally Posted by Z3_GoCar View Post
    E-production has the exact same compression ratio and cam limits, the only differences are h-beam rods and dry sump oil system.
    What "same"? 12:1 or 12.5:1?

    Rods are free and 3-stage dry sump is allowed in STU.

    - GA
    Not my circus...not my monkeys...

  5. #5
    Join Date
    Oct 2006
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    Quote Originally Posted by Z3_GoCar View Post
    Thanks Greg,

    I'll get the thicker head gasket. That's crazy because, E-production has the exact same compression ratio and cam limits, the only differences are h-beam rods and dry sump oil system.
    STU allows replacement rods, pistons and dry sump systems.

    you could also shave down your piston tops if it is a domed/pyramid type.

  6. #6
    Join Date
    Aug 2005
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    Thanks Eric, I figure that a +0.030 thicker MLS gasket ought to lower the compression by 1/2 a point. At this point I don't want to mill the dome as I'd then have to have the top ceramic treatment redone.

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