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Compression numbers

Discussion in 'Wrangler YJ (1986-1995)' started by Jeepjoc, Nov 30, 2017.

  1. Nov 30, 2017 at 2:50 PM
    #1
    Jeepjoc

    #1
    Jeepjoc [OP] Well-Known Member

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    Dennis
    Albertville, AL
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    1995 YJ Wrangler Rio Grande
    What is considered good cylinder compression numbers for a 2.5L engine and what difference range is considered acceptable?

    Thanks - MGjoc
     
    Jeepjoc, Nov 30, 2017
    #1
  2. Nov 30, 2017 at 4:53 PM
    #2
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    From what I can gather, 120 to 130 psi +/- 20% across all cylinders.
     
    chris4x4, Nov 30, 2017
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  3. Nov 30, 2017 at 5:35 PM
    #3
    Offroad798

    #3
    Offroad798 Well-Known Member

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    Bob
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    fenders, bumpers, winch, inner fenders, cb, headliner storage, oil pan armor
    Here is my 2 cents worth. From what I remember when I work as an auto tech they said at least 100 psi for each cylinder with no more then 10 % variation between the highest and lowest. Chrysler says 120 - 150 psi with max variation of 30 psi between cylinders. For 2.5L engine. Hope this helps. FYI - to run a compression test - engine warm near operating temp, disable fuel system ( relay or fuse), remove all spark plugs, hold pedal on floor (throttle body wide open) - crank all cylinders the same number of times usually 5 -6 good luck
     
    Offroad798, Nov 30, 2017
    #3
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