Hi Guys,
ive done a compression test and all cyclinder is 12 bar except cyclinder no 3 which is 11 bar...
Is there a serious problem? As i will send my car for a re-tune soon.

Thanks

 

Anyone mind to share....

 

Do a leak down test, it'll tell you more about what's going on...

 

What is a leak down test and how to do it?

Thanks

 

In a compression test, you want the numbers to be reasonably close to each other so yours are, within reason, similar enough that I would not be concerned.

As for the leak down test, read this:

http://en.wikipedia.org/wiki/Leak-down_tester

You essentially pressurize the cylinder and see how much/from where its leaking. It can tell you if you have problems with intake valves, exhaust valves, cylinder rings, etc.

 

1 bar is 14.5psi I wouldnt be concerned.

Your results translate to-

#1- 174
#2- 174
#3- 160
#4- 174

That amount of variation can be because of several possibilities unrelated to failure of components. If it were down around 8 or 9 bar I would be concerned.

 

^^ listen to him

 

Thank you so much John Bradley

 

2006 Evo IX. My numbers today were 135,145,145,145. It looks like these are lower than other cars but there is a similar disparity in numbers. What is your take on that?

 

99% sure the IX's compression numbers are lower than the VIII's. If you search a bit, you'll find out your numbers are likely normal.

 

I will def search when I'm home later. It's a bit tedious from te phone but figured I would take a shot and hope to get an answer before then. Thanks dude

 

https://www.evolutionm.net/forums/5919468-post66.html

There you go. I'm such a nice guy!

 

Awesome dude thanks so much! Maybe the clock won't drag at work now that the suspense has been lifted.

 

you are fine... just enjoy the car. Why did you do a compression test in the first place

 

whew thank god I did a compression test on my car and it was 135, 145, 135, 145(or some combination of that)awhile back and I was scared.