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  1. #1

    Min. Compression for 8V92

    What's the minimum compression figure for a 1978, 17:1 CR, 550 HP, twin turbo 8V92?

    Thanks.

  2. #2

    Re: Min. Compression for 8V92

    Follow up:

    Obtained a 1978 Detroit Diesel Field Service Data Book which stated the minimum compression for this engine is 450 psi.

  3. #3

    Re: Min. Compression for 8V92


  4. #4

    Re: Min. Compression for 8V92

    Thanks, Craig.

  5. #5

    Re: Min. Compression for 8V92

    According to the shop manual, minimum compression on a turbo 92 series is 380. Average is 430. Readings are taken at idle, 600 rpm.
    Seems like most surveyors will call out anything below 400, or if there are big variances among cylinders.
    George
    Former Owner: "Incentive" 1981 56MY
    2007-2014

  6. #6

    Re: Min. Compression for 8V92

    Quote Originally Posted by GJH View Post
    According to the shop manual, minimum compression on a turbo 92 series is 380. Average is 430. Readings are taken at idle, 600 rpm.
    Seems like most surveyors will call out anything below 400, or if there are big variances among cylinders.
    Thanks for the reply, George.
    I've seen a 1978 and a 1979 DD Service Manual, and they both list this this engine as a 380/430 engine, but that page is dated 1973. The page in the DD Data Book that list it as a 450/500 engine is dated 1978, so I thought/assumed that would be the correct figure.
    The compression range on the engine I was looking at ranged from 410 to 480.
    Tom

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