What causes an ENGINE TO HAVE HIGH COMPRESSION?


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Thread: What causes an ENGINE TO HAVE HIGH COMPRESSION?

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    What causes an ENGINE TO HAVE HIGH COMPRESSION?

    Anyone know what can cause higher than normal engine compression?

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    How much too high is it?

    How did you discover it was high?

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    I used a compression gauge.
    Reading was double in the rear. The front wasnt quite as high as the rear.

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    I've never heard of it but extreme carbon build up could make the combustion chamber smaller, I suppose... Usually a cylinder will loose compression from this due to leaky valves/rings.

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    I'd check first with a second gauge, it should never be double. Higher compression readings are caused by carbon deposits that are stuck to the top of the pistons.

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    +1 try another gauge to rule out defective tool.

    Quote Originally Posted by bryanova View Post
    I'd check first with a second gauge, it should never be double. Higher compression readings are caused by carbon deposits that are stuck to the top of the pistons.

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    Let's see...Double compression would be somewhere in the area of 18:1 (just a guess as I don't know what the actual CR is for an 1800)...That would be too high for premium pump gas (limits there are about 14:1 max), and you would have so much detonation going on that you would've already burned holes in both pistons...I'd be checking to make sure that gage is accurate...

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    i think the manual specified 95psi per cylinder, but i have heard of people with up to 120 psi per cylinder. The only explanation for this problem,
    carbon buildup in the combustion area. Maybe try some Lucas fuel additive to clean the injectors and carbon buildup. Good luck! O~by the way, What were your compression readings!!!!

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    Faulty decompression cam.

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    Quote Originally Posted by bigjon View Post
    faulty decompression cam.
    +1 ........

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