I just did a compression test on my 2.3L , it has maybe 150 miles on it, it only gave me 150 across. car was ran about 1hr before test.

is this normal? if so when should i do another test to confirm im getting all the compression out of my 2.3L?

 

it will take a couple thousand miles to settle in.

 

wow ok, i did not know that, thanks!

 

my last motors compression moved around a bit till about 4,000 miles then it stayed there.

 

150 across is good for an engine that only has 150 miles.

 

Also remember that big cams will give lower cranking compression than smaller cams due to the larger overlap and the engine not spinning fast enough to compensate, but on high rpm running it will pay big dividends.

 

I suggest you talk to the engine's builder.

None of my motors required over 20 miles to reach 95% of their break in.

Hell my current motor was broken in - on a dyno - at 25 psi and 8000 rpm...

 

can the mini battery cause it as well? that things a pos.

 

my motors have perfect compression after 2 minutes. if it aint broke in after then it never will.
best test to see if you have good ring seal is remove oil cap while the engine is idling. a good motor will not spill any oil. very little air will be felt.

150 psi is prolly not bad. depending on cams and cranking rpm.

 

kelford 272 and i was using one of those mini oddesey batteries, and it sounded like it was dying when i was cranking it. no smoke or blowby or anything like that, i will do the oil cap thing you said and post back.

 

a decent amount of air hits my hand, but no oil splashes on my hand or anything. I did this as it was warming up. David said these are typical numbers for a 2.3 of his at this point in time.

 

Relative thread about my car's compression numbers. I think you're ok.

https://www.evolutionm.net/forums/ev...t-monster.html

 

great, thanks for posting this. I will recheck it at 3000 miles. I'm waiting for nick to call me back now so i can schedule a dyno tune.

 

Cams, actual compression ratio, valve size, TB size, etc. all play their role. That much and that even across the board wouldnt worry me. If it were down at 100 or something I might check my tester with another one to make sure but other than that 150 is about average.

Johnny's S2'd 2.4 9:1 is 145 or something, makes 511 on pump and ran out of fuel at 593 on his Black. So in otherwords you sound about right