Just turn the engine over by hand until the valves close.

 

^^ and we know when the valve closes how?

TDC?

 

When the leak stops and the pressure builds.

 

O I get u hahah sorry

Ima do it today n ill post results

 

bump

 

Dan did a compression test on my car today. The motor was not hot but was still warm. These were the results cylinder # 1: 125 # 2: 125 #3 130 #4 130. Not sure what to make of this. Is this good? Should the motor be fairly hot?

 

Your throttle needs to be down 100% when conducting the test.

Results should be about 180 across all 4 on a perfect engine.

Leakdown test tells more information.

 

I don't know what EGR is but, I tried to do my own boost-leak test last week and I read 0psi no matter how much air I put into the turbo. But I had a boost-leak test done about 3 weeks ago at a shop and it read boost up to 30psi. I have since changed my BOV and hookup arrangement with a custom built area so I needed to test that area for leaks but I couldnt get my car to read any pressurized air. None at all. My compressor was apparently sending out 30psi for about 45 seconds straight, my boost gauge in the car never moved at all and I didnt even hear my turbo spinning. I think it was my compressor??

 

I was told that you are not looking for a exact number when doing a compression test but consistency.

 

The leak should be easy to find with the air running and you under the hood.

That is correct, as items like larger cams tend to reduce the static compression test numbers significantly. When this happens, it does so across ALL cylinders, so consistency is the only reliable indicator.

 

Wired issue Leo. I'm guessing there is a line off somewhere for sure. I have neveer put my car at TDC when boost leak testing it and have always been able to put air into the system without issue.

Tripple check all lines something is off

 

Ted,

Do you mean simply when the car is running? Or did you mean if I correctly sent pressurized air through the system with a boost-leak test it would be easy?

 

I mean you pipe in air, let it leak, and use your ears, and possible a spray bottle with soapy water to find where the air is escaping.

 

Looks ok for a 9.

Evo 8 has higher comp test #'s, around 160-180

Evo 9 is quite a bit lower, 130-150

It's not just "180" for all like somebody previously stated.

Also consistancy between cylinders is the big thing to look for.

- Bryan

 

Compression numbers will have several factors including aforementioned effect of cams, pistons, if the head has been cut, what headgasket is being used and so on.

Our race built and OEM rebuilt engines typically are 180 across the board.