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Thread: compression test

  
  1. #1
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    compression test

    is there any way i can do a compression test when the engine is out of the car. i have the compression gauge. or would it be a garage job
    any help would be great

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    if the starter is still attached power it up to spin the engine.
    no comment

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    will that give me a true reading or is that it just whack a battery on and away to go

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    well if the engine was in the car it is spun up using just the starter.
    should give a good reading i think
    no comment

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    the only reason i asked is we tried it today and only got 60psi on all 4 cylinders just didn't seam to have enough power even with jump leads off a running car. the engine is nice and free to turn by hand and its not the gauge as we tested it on keith's sri-t

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    you could try a cylinder leakage test.
    if the compression is as low as 60psi then the engine would turn easy.
    no comment

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    it would turn easy anyway as there was no plugs in so would i be right in saying there is no compression without plugs
    never tried to turn it with the gauge in by hand i mean

    sorry i'm a bit novice as mine is the first engine i have ever striped down

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    pop a bit of oil down on the Plugs see if that brings up the PSI

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    i will try a bit of oil tomorrow. could the starter motor have anything to do with it turning over slower than another car

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    I take it this is with the new piston Chris?

    If so then you should be getting 150psi+, did you fit new ring's?, if so then they need to bed in before you can test it.
    Astra SRi Turbo
    281|317

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