Evo IX Compression test
6 psi difference means good. To confirm that your testing just gives low #'s find another evo to test side by side to confirm. Basic scientific theory.
If your car reads 130-140 and the other car reads 180 across then you got yourself a leak.
If your car reads 130-140 and the other car reads 180 across then you got yourself a leak.
Last edited by C6C6CH3vo; Mar 25, 2006 at 07:53 AM.
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Originally Posted by C6C6CH3vo
6 psi difference means good. To confirm that your testing just gives low #'s find another evo to test side by side to confirm. Basic scientific theory.
If your car reads 130-140 and the other car reads 180 across then you got yourself a leak.
If your car reads 130-140 and the other car reads 180 across then you got yourself a leak.
Well, that would be a great idea, but I don't know anyone else with a IX. I have plenty of friends with VIII's. It says in the service manual for the VIII that the "standard compression is 163 psi" it also says that the minimum is 138 psi. I checked it with two different gauages and got similar readings. That is why I was hoping someone could look in the IX maintence manual and tell me if the "standard compression ratio" of 163 psi is the same for the IX.
Thanks to anyone in advance that can help.
Maximum Boost
Last edited by Maximum Boost; Mar 25, 2006 at 11:37 AM.
One more time to confirm if you have a leak. Test side by side with another evo albeit 8, to confirm your testing low or your engine leaks. If the other car reads 180 across - well? If it reads the same as yours then go to sleep tonight in pease. Best of luck.
Where is the rest of the image in that avitar? Is that a photo of your wife?
Where is the rest of the image in that avitar? Is that a photo of your wife?
Originally Posted by Az3ar
Did you unplaug your fuel pump fues
Did you run the chech on normal engine temps
Did you crank it enough 6 ~8 times
Did you take all the spark plugs out
Did you run the car until it dies after taking the fuel pump fues
and last what are your number on all pistons?
Did you run the chech on normal engine temps
Did you crank it enough 6 ~8 times
Did you take all the spark plugs out
Did you run the car until it dies after taking the fuel pump fues
and last what are your number on all pistons?
The throttle was wide open during the testing. Tested another Evo with the same gauge. It was and Evo 8 and it read 185 psi. Anybody have the repair manual for an Evo 9, so we can see if the compression readings are lower on the Evo 9.
Brian
Brian
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maximum boost, now that u did a dry test, do a wet test, squirt a tad bit if oil, just enough so u know it creates a film of oil over the top of the piston and piston rings most importantly. then see if the numbers go up. the numbers you posted are very close so thats good.
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Originally Posted by Danny23
180 sounds a whole lot better, 140 is definetely to low
Well, I guess that seals the deal, the motor is kaput...............
I feel like I want to cry................. 
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Where is the rest of the image in that avitar? Is that a photo of your wife?[/QUOTE]
No, it is not my wife, I may get my "account disabled" if I told what was in the rest of that avitar though....
P.S. I would not mind if she was my wife though..
No, it is not my wife, I may get my "account disabled" if I told what was in the rest of that avitar though....
P.S. I would not mind if she was my wife though..