Ok i searched and did not see anything but my car has 130k , still runs fine but want to do a compression test and see where i am at . So i was looking for the compression i shoul dbe at or around . If anyone knows it it would be great help .


Thanks
Antonio

 

What's important is that they're all the same.

 

Oh ok but is there supposed to be a certain pressure that they should all be at when they are still all good ?

 

I'll take a guess at 170, I'll see if I can find a more exact value though.

 

Ok great info !
Thanks!
Ill be doing this tonight or tomorrow morning !

 

Within 10% of each other is good.

 

Ya they should all be about the same give or take a few psi like if they are all with in 5 to 10 psi of each other then its good.. I just did my Evo 8 a month ago and it was Cylinder #1 - 141psi #2 - 145psi #3 - 138psi #4 - 143psi... And its all good that car has 59k miles on it too... My other Evo the 4 I tested about 3 months ago and was at #1 - 147psi #2 - 150 #3 - 144 and #4 145 it has 67k miles and this one has a freshly rebuilt head on it thats just over a year and a half old with about 10k miles on it also make sure your battery is good if it is low your compression may be lower too... In a NA car the compression should be a bit higher like I think 180is maybe even more... My BMW was around 200s but its a higher compression motor.. Evos are lower compression with forced induction to raise the compression Lover turbos But ya all cars are different as you can see but yes the main thing is that they are all about the same When I first bought my Evo 4 a few years ago it felt fine it was mostly stock and I would race my friend in his stock 06 STI and I could barely pull on him too I was happy then I did a compression test just to see how it was doing and it was #1 - 115psi #2 - 45psi #3 - 132psi and #4 - 90psi so I figured I would rebuild the it.. The bottom end look really good but the head looked like it could use some work and so I just rebuilt the Head and it tested much better

 

Yup i want to just rebuild it right now that i have time , and i am planing on rebuilding the head because i know it needs new valve seals , and thought let me just check the compression to just do the whole motor . When i do this thou i might go with aftermarket valve springs and cam . With a bigger intake manifold .

But im hoping that it does need new rings just to give it a little more juice on this slow car =/ lol

I also have an offer for a evo 8 stage 2 cam motor for really cheap but dont want to have to convert it to awd , but do you know if the 4g64 tranny fits on the evo 4g63 block ?

Because i think i saw a thread that a guy was putting a 4g64 block on the evo so i thought what diff would it be to just do the tranny since the block works with the evo tranny , why wouldnt it work the other way around .

 

i did a compression test on mine about a month ago just to see what the psi was because i was bored. and mine ranged from 150-152 psi.

 

Ok so i just did mine and it came out pretty good

190 on all of them
Cyl 1

Cyl 2

Cyl 3

Cyl 4

 

I'm going to have to test my car. It's recently boosted and has 145k on it right now. I noticed some oil when I changed my spark plugs so I know I'll need to replace some stuff already...

 

how does a compression test work? i have 120k and it sounds like something i oughta check out.

 

hook up a compression tester gauge(google it). Disconnect the coilpack plugs. Pull fuel pump fuse. then with the tester on the cyl your testing but leave the other three spark plugs in... Have someone rank the engine for i think 10 seconds i think, and watch the gauge. As the needle bounces, the highest point it reaches is your compression for that cylinder. Mines was about 150 even so yours is gonna be about 170-180 according to the manual if i remember correctly. Shoot me a pm...