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Why my compression is very high?

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Old May 24, 2006 | 03:36 PM
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Exclamation Why my compression is very high?

Today i test my compression with original mazda tester and here is the result.
When I test it the car is complete cold.
Attached Thumbnails Why my compression is very high?-pisorotoras.jpg   Why my compression is very high?-mprostarotoras.jpg  
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Old May 24, 2006 | 06:36 PM
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Showoff.
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Old May 24, 2006 | 06:45 PM
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wow, that's 147psi uncorrected. At what altitude was the test was done?

Last edited by patriick; May 24, 2006 at 06:47 PM.
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Old May 24, 2006 | 07:22 PM
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You want to test your compression after the car has been thoroughly warmed up.

When you tested one rotor, did you have both plugs removed from the other rotor?
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Old May 24, 2006 | 07:24 PM
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That about the same as mine, tested with motor at normal operating temp. I was told that it should be done cold.
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Old May 24, 2006 | 08:23 PM
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The FSM directions explicitly say to warm the engine to operating temp, then conduct the test after ten minutes to let the manifolds cool.

Ten minutes leaves the core of the engine very warm and thoroughly lubricated. I believe compression results are abnormally high if the engine is cold.

Dave
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Old May 24, 2006 | 08:28 PM
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I have that same tester and i just got it fixed and i have the Original mechanical with thermal paper tester =-)

I love working at mazda and fiding "unwanted" ****. hahaha both work now to

los
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Old May 25, 2006 | 02:05 AM
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I try to test it again with warm up engine and post the results.
The tester from my house is 600km away.
What numbers do you think that I take with hot engine?
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Old May 25, 2006 | 06:11 AM
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I wouldn't bother, they might go down by 1.0 or so. It's pretty clear that your engine is in good shape.

Dave
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Old May 25, 2006 | 06:48 AM
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Originally Posted by dgeesaman
The FSM directions explicitly say to warm the engine to operating temp, then conduct the test after ten minutes to let the manifolds cool.

Ten minutes leaves the core of the engine very warm and thoroughly lubricated. I believe compression results are abnormally high if the engine is cold.

Dave
Thanks for the info I should have expected as much from a dealership...

Like your second post states I found the answer I was look for with my test, the apex seals are healthy.
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