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90 240 330,000 miles compression test results? 200

posted by  derek uk on  Sat Oct 17 15:41 CST 2015
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last visit: Fri Oct 24 12:33 CST 2014
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Throttle should be wide open when testing. Try repeating the test with about a teaspoon of oil down the bores. That helps to seal the rings. If the numbers improve by 10-20 it shows that there is some blow-by at the rings. Numbers shouldn't vary by more than about 10%. However, generally speaking, if the engine is running well and not burning too much oil, at that mileage it can be said that it is doing OK. 150 is an honest sort of number.






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