Engine CompressionAtmospheric pressure at sea level is approximately 14.7 psi.A 9:1 compression ratio cylinder is compressing the air and fuel mixture to about 132 psi at sea level (9x14.7=132.3 ...

If all those engine goodies don’t result in cylinder pressure, performance is sure to disappoint, and there’s more to the story than you think. From the June 2004 issue of Car Craft magazine.

Compression test kits do just what they say: measure the ability of each cylinder of your engine to combust the fuel/air mixture without losing any of the resulting energy.

Mityvac’s compression tester is unique in this list for including an air-hold adapter that you can use to effect valve seal repairs without having to remove the engine’s cylinder head.

A compression test reveals the condition of your engine's valves, its valve seats, ... TIP For a cylinder below 100 psi, pour 1 teaspoon of engine oil into the plug hole and retest.

on the compression tester's gauge. Make sure to count the number of engine revolutions it takes to reach max pressure and repeat the test for each cylinder, cranking the engine the same number of ...

This reduces compression in the cylinders and you don't get as big a bang for your buck, so your vehicle loses power. Piston rings can be replaced, but it's an expensive job.

Oil loss or power loss might suggest bore and piston ring wear and a compression test is a simple way to show how well our pistons are sealing. A similar test is for cylinder leakage, the ...

A better name might be cylinder-pressure test. A rough estimate of cylinder pressure is 15 to 20 times the compression ratio. So 10:1 should produce about 150 to 200 psi. Production-engine ...

Compression test kits do just what they say: measure the ability of each cylinder of your engine to combust the fuel/air mixture without losing any of the resulting energy. While they're not as ...