![]() ![]() You should start to worry if one of your cylinders is getting close to 100 psi. … Low compression in one cylinder usually indicates a bad exhaust valve. As a rule, most engines should have 140 to 160 lbs. Is 160 compression good?Īn engine is essentially a self-powered air pump, so it needs good compression to run efficiently, cleanly and to start easily. Is 150 psi compression good?ġ50 psi is considered a good compression. What PSI is 10 to 1 compression?ġ0.0 to 1 = 200 psi etc. Higher compression ratios allow the same combustion temperatures to be achieved with less fuel. That’s because the higher ratio allows for an engine to extract more energy from the combustion process due to better thermal efficiency. What does higher compression do for an engine?Ī higher compression ratio (CR) is beneficial for engines. The higher this ratio, the greater will be the power output from a given engine. How is compression ratio related to pressure?Ĭompression and Pressure Ratios The compression ratio is defined as the ratio between the volume of the cylinder with the piston in the bottom position, V bottom (largest volume), and in the top position, V top (smallest volume). Furthermore, that reading should be above 135 PSI. The most desirable situation is that all cylinders, give the same or close to the same reading. Similarly, a compression of 85 PSI or lower is extremely bad. What is a good compression pressure?Īs a general rule a compression of 135 PSI or better is excellent. Correct the pressure for the specific heat effect factor. The high-speed value would be the 8.55:1 effective compression ratio x 14.7 psia, or 125.69-psia. Multiplying the low-speed effective compression ratio of 7.32:1 x 14.7 would yield a compression pressure of 108.84 pounds per square inch gauge (psia). ![]()
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