Question about 1989 Honda Prelude
The standard compression for your honda would be around 175 psi the minimum would be around 135 psi. they should be the same new or old engine. and there not the same for all engines
Posted on Sep 30, 2009
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To do an accurate compression test, remove all the spark plugs from
the engine. Then disconnect the coil wire from the distributor and
connect a jumper wire from the coil wire to the negative (-) terminal
of the battery. Prop the throttle plate so it is wide open. Connect a
remote starter button from the positive (+) terminal of the battery to
the small connector of the starter. Put the ignition key in your back
Now install the compression tester in cylinder number one and crank the engine about six or seven turns. Write down the compression reading and go on down the line. Good compression would be about 150 - 180 pounds. More important that the actual compression is that the readings should all be within 10% of each other.
Now that you have the dry readings, squirt two or three good squirts of motor oil into number one and do the test over. Note the reading next to the dry reading and go on down the line. Once you are done, compare the wet/dry readings. If the wet readings show a marked increase, say 20 to 25%, then you have ring problems and it's time for an engine overhaul. If there is a small increase, say 5 -10%, then the problem is in the valve seals and they will need to be replaced.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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