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Thread: ST170 engine info

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    ST170 engine info

    having a bit of a tidy up i just came across some notes i made when i stripped the only and only ST170 ive ever had in bits, thought they might be useful to someone

    At TDC pistons were 0.025" down the bores
    Piston bowl 7cc
    used head gasket thickness 1.1mm
    head gasket bore 86.5mm
    head gasket volume 6.46cc
    unskimmed head volume 43cc
    stroke 88mm
    bore 84.8mm

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    Re: ST170 engine info

    What does the compression ratio work out at using theses figures ?

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    Re: ST170 engine info

    i think officially the engine was supposed to be just over 10:1, but i got 9.75:1

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    Re: ST170 engine info

    Thanks Graham I put the details in a engine calculator and also got around 9.75:1 I was wondering where I was going wrong thanks for the reply

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    Re: ST170 engine info

    Quote Originally Posted by Turboman View Post
    Thanks Graham I put the details in a engine calculator and also got around 9.75:1 I was wondering where I was going wrong thanks for the reply

    i used a good old fashioned calculator and my head, so good to know some of my marbles still function

    thing is a lot of engines dont come out exactly what they are advertised as. it might be down to production tolerances and or small inaccuracies in measuring.

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