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Wednesday, November 9, 2011

How to Do a Compression Test


Compression tests are usually done to test the engine in racing cars and other vehicles with high-performance engines. The test can be used to diagnose problems in the engine or to measure and improve engine performance. Some basic knowledge about automobile parts and maintenance is helpful if you want to learn how to do a compression test.

Steps

  1. Bring the engine to its normal running temperature. This can be done in the following ways.


  2. Switch off the engine completely before beginning the test.
  3. Remove the fuel pump relay. This will disable the fuel system since the fuel will not be injected into the cylinders.
  4. Disconnect the electrical connection from the ignition coil pack. This will disable the ignition system since the ignition coil pack will be unable to create and distribute the spark from the spark plug.
  5. Take out the spark plugs and disconnect the wires for each spark plug. Handle the spark plugs cautiously since the ceramic insulator of a spark plug can break or malfunction if not handled delicately.
  6. Put the engine compression gauge into the first cylinder's spark plug hole (this is the hole that is nearest to the drive belt). Don't use any additional tools to tighten the compression gauge, you should only use hand force.
  7. Ask a helper to start the engine. The needle on the pressure gauge will rise and once the needle has risen to its maximum reading your helper should stop the engine. This maximum reading is the maximum compression value for the first cylinder that you have just tested.
  8. Repeat the engine compression test for the other cylinders until you have tested all of the cylinders on your engine.

Tips



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