![]() ![]() If the reading remains the same, it could mean valve problems. If the reading jumps significantly, it’s an indicator that your piston rings are worn out and likely the culprit. Tip: For any cylinder that displays below 100 psi, pour 1 teaspoon of engine oil down the spark plug cavity and perform the test again. Compare the results, and check for any variation over 10%.Repeat the process for each cylinder, and write down the results.Crank the engine a few times over until the pressure reading tops out.Remove the spark plug and replace it with the threaded end of the compression gauge.Disconnect the main coil wire, spark plug wires, fuel pump, and fuel injection fuses if your car is non-carbureted.Using them is quite straightforward, although the exact steps will vary depending on what car you drive and how old or new it is. How to Use an Engine Compression KitĬompression kits allow you to examine the condition of the valves, piston rings, and other cylinder components and analyze if they have even wear and tear. It’s worth mentioning that the actual readings will vary from gauge to gauge. It is the difference in pressure between cylinders that are the main factor of measurement. It is pretty normal to find a mild variation in compression between different cylinders however, note that the readings should not be more than 10% apart. As per the norm, each cylinder should be able to produce and sustain a compression rating of at least 100 psi per cylinder or more, depending on the engine. Optimum Compression ReadingĪn indicator of good engine health is when each cylinder generates the same compression pressure. However, in this article, we’ll stick to discussing compression tests only. Worn-out engines can easily leak 25% or more and damaged engines even more so. The gauge will show how quickly that pressure escapes. Leak-down tests involve injecting 100psi of pressure into the cylinder you’re testing. This can be done by performing a compression test at the minimum, which can be followed up with a leak-down test.Ĭompression tester kits like the ones listed below are used to determine your engine’s capability of creating pressure, while leak-down test kits show how well your engine maintains pressure. Checking compression pressure is the perfect opportunity to use some engine degreaser to make your job tidier. ![]()
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