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Thread: 186 compression psi??

  1. 23rd May 2013, 02:13 PM #1
    custommade
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    186 compression psi??

    Hi, Just got a SWB 2A with a 186 in it. It seems to have a lot of crank case pressure, oil out the dipstick, puffing out of the pcv hole if i pull the pcv hose out.
    But.... It has about 140psi after a compression test and I thought that was ok but maybe not?

    The PCV valve and hose are fine so I think it might be blowby.
    And it does seem very low on power.

    So do you think I'm up for a rebuild?
    Anyone done one lately and know the cost of machining.
    I would do the spanner work.
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  2. 23rd May 2013, 06:59 PM #2
    bobslandies
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    Hi,

    Did you wash the PCV in petrol to clean it? It's a spring loaded valve so may be gummed up. Had to replace one once in a 186. Check the hose too for blockage.
    Hope this is of some use.

    Would think you would see 135-160psi at least compression in a 186 with only a variation of 5 or so psi.

    Bob
    Last edited by bobslandies; 23rd May 2013 at 07:11 PM. Reason: Added the compression test expected pressure
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  3. 23rd May 2013, 07:33 PM #3
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    Bearman
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    pretty sure (from memory) forgive me if I am wrong, the figure is 165psi with 10 percent variance between cylinders.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)
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  4. 24th May 2013, 07:38 AM #4
    custommade
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    PCV seems fine, it rattles and he hose is clear.
    Maybe it's just a shaged engine
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  5. 24th May 2013, 08:39 AM #5
    bobslandies
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    Quote Originally Posted by Bearman View Post
    pretty sure (from memory) forgive me if I am wrong, the figure is 165psi with 10 percent variance between cylinders.
    Hi Brian,

    My uncle used to marinise engines for GMH and rebuild Holden sixes and he tried to get a lesser variance between the cylinders so I remembered that. I rang him and he said that you are right - a 10% variation is ok. 165psi in a 9.2:1 186 would be a good engine, getting close to that on all cylinders would be ideal.

    Bob
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