I did a compression test today on my 03 evo and all four cylinders posted 90 psi on the gauge. I know most cars in the mid 100's. I do not think its blown head gasket how ever. I am not to familiar with these types of results because every time i've seen normal compression and one low cylinder not all four low. So help me out guys thanks

 

Normal wear and tear if they are all low. How many miles? What prompted you to do a compression check in the first place? Blowing smoke? Down on power? Need Mods/miles/driving style to help you out some more!

 

90 is way low though. There has to be some sort of problem.... No way that the car is supposed to run at like 155 or so and is down to 90 due to "Normal wear"

 

Evo 8 specs 800 - 1200
Evo 9 specs 650 - 1000

Sounds like you have an evo 8.

90 PSi is 620 - or 6.2bar. Way below presure
Make sure to test it when the engine is warm to hot, and also drop in a teaspoon of oil. If presure increases your rings are gone.

If you have one drop in a cylinder scope via the plug hole (bore scope fiber optic) and check the wear patern on the cylinder. Will tell you quite a bit!

 

thanks i will try this and get back to you guys the engine was cold when i did it. There is no smoke anywhere. The reason i did the test was because i was buying the car. I got it dirt cheap so motor needing work I could care less. stroked 2.3 here we come!

 

What prompted me to do the compression test was that the car felt slow when i drove it. It has 35 thousand miles. The mods exhaust 3 inch downpipe, BOV, Injen intake with upper intercooler pipe. I also noticed it seems to eat a lot of gas. I know going into boost eats up alot but its driven normally barely hitting boost and gas gets eaten up fast. It use to have a super AFC that was taken off of it and the manual boost controller. I also know that the previous owner did not give it oil changes at 3000 miles. Idiot went over. But what ever is wrong its no big deal its a project car that i got for a very low price, but i do want to get those problems fixed quick so more modding can take place

 

are you doing the compression test correctly?