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MazdaSpeed 3 - Engine, Transmission & Driveline Discussion of engine, tranny and drivelines.


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 Old 10-22-2009, 08:47 AM   #1
 
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Default Compression test on built motor

Just thought I would let you guys know what kinda compression im getting on my built motor. I have about 8k miles on it since the build and running about 19-22psi of boost. I got the car warmed up to about 165 degrees (coolent temp) and did the test. Ill start from the pulley side of the motor first,I cant remember if thats #4 or #1.

183 180 179 181



That is all for now..
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 Old 10-22-2009, 08:52 AM   #2
 
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Sweet! that looks great right?
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 Old 10-22-2009, 09:23 AM   #3
 
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Its within spec.,I was thinking it would be closer to 190psi but this is still good.
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 Old 10-22-2009, 11:49 AM   #4
 
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how much diff is that from stock.
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 Old 10-22-2009, 11:52 AM   #5
 
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i CT'ed at 185 across the board on arias 8.8:1. You really should compression test when the car is piping hot (op temp of 190* for 10 minutes). stock compression i had 190s across the board.
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 Old 10-22-2009, 02:48 PM   #6
 
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Originally Posted by clos561 View Post
how much diff is that from stock.
My stock #s were: 180 172 175 173



Compression test done..
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