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uneven compression 300 1988

posted by  steve oakes on  Mon Dec 31 08:05 CST 2001
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last visit: Thu Oct 16 16:05 CST 2014
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My 760 turbo has the following compression: cylinders 1,2,3: 135 lbs. Cyl 4: 150lbs. The car burns alomst no oil (a half quart in 5K of highway driving) and has no appreciable blowby (passes jiggle test). The car shows no signs of ever having overheated. What might be the cause? My guess is worn valves. It would sem that if the problem were rings I'd be burning oil or having blowby troubles. So all you motor pros out there..what's your guess? And the remedy? Pull the head and grind valves? Have a great new year all!
-Steve








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uneven compression 700 1988

uid 4706's pic
posted by  Hank Scorpio on  Mon Dec 31 19:49 CST 2001
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Which cylinder did you start with? Warm engine? Did you add oil and retest each cylinder to rule out the rings? I don't think a 10% difference is enough to be worried about, but from what little I know, 135 does sound like it's on the low side. You could try a leakdown test too.
--
Michael -- 1987 244 GT | Volvo 240 Links








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uneven compression 700 1988

posted by  someone claiming to be Chris in Calgary on  Tue Jan 1 09:33 CST 2002 [RELATED]

Does anyone know of a source of decent, cheap leakdown test equipment, or how to make your own? I would prefer this to compression testing, especially when dealing with old kickstart motorcycles.







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