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Evo 8 Compression Test

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Old Aug 23, 2008, 07:47 AM   #1
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Evo 8 Compression Test

From left cylindar to right cylander i got

153-160-165-165

I was told that was good for 08 motor with 65k miles..
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Old Aug 23, 2008, 07:50 AM   #2
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Drives: 2003 Yellow Evo 8

i meen 03 motor.
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Old Aug 23, 2008, 07:51 AM   #3
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and these numbers i DID NOT open the throttle by pushing all the way on the gas when cranking over. So these numbers prob would be a little higher
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Old Aug 23, 2008, 11:17 AM   #4
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I just did my 03 with 50k. 175-166-175-176 WOT
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Old Aug 23, 2008, 11:22 AM   #5
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7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 kPa (14 psi)
9. If there is a cylinder with compression difference or a
compression difference that is outside the limit, pour a small
amount of engine oil through the spark plug hole, and repeat
the operations in steps 6 to 8.
(1) If the compression increases after oil is added, the cause
of the malfunction is a worn or damaged piston ring
and/or cylinder inner surface.
(2) If the compression does not rise after oil is added, the
cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.
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Old Aug 23, 2008, 11:28 AM   #6
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Drives: 03 Evo VIII

compression looks fine
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Old Aug 23, 2008, 11:28 AM   #7
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Your in good shape. no worries
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Old Aug 23, 2008, 11:31 AM   #8
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I think its 15-20% difference between cylinders that you need to worry.
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Old Sep 19, 2008, 10:32 AM   #9
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mine is 150 on all of them is that ok
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