The cylinder produces 40 PSI in the first laps while it has 35 PSI in the continuous stroke. Differences between the cylinders show a leaky, broken, or worn-out valves- it can also be both.ĭuring engine cranking, observe your tester, you should notice the differences of each cylinder pump. The compression testing results should not be more than 135 PSI, and if the cylinders have uneven compression readings, it should not go beyond 20% between the highest and lowest. If the reduction goes to an average of 85 PSI, it means there is a bigger problem in your car worth repair. For an average engine that offers you better performance, it should have a compression of 135 PSI. There is more than just one thought you get after doing a compression test. They should be on the 5% level of each other. Push it definitely on the sparkplug terminal- all this while testing the cylinder manner.
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