I just finished doing a compression test on my 05 EVO VIII. From right to left: 175, 175, 175, 155. A cap full of oil put the 155 to 180. Should I be concerned? I'm inclined to say yes, but I do over-react with these kind of situations. I have DTM spec 280 cams installed.

Testing procedure was as follows: Car was driven for 30 miles, parked, maximum of 5 minutes of cooling down before I got the plugs removed. I then disconnected the plug from the backside of the valve cover by the PCV tube. Test was done at WOT.

 

Need some advice guys. Should I be concerned? I plan on getting a leak down test tomorrow. Is 155 psi below the service limit?

 

Compression seems to be fine. If you would like a free leak down test to confirm, please stop by.

 

yes, i would say u have some leaky rings, but.... its just over 10% lower than the rest so im sure u are not going to notice.

and if im not mistaken, 175 is really high for a stock evo 8