i just bought a compression tester to do a test while i find an afm to buy (because it went bad) .. and on a low charged battery.. it was..

front: 50-60-60 (somethin like that)
back: 30-30-60 (for sure that)

this was with the battery being low, i know this effects the compression and im not so worried about the front rotor, but the rear i am.. could this be carbon or am i screwed? should i just buy the afm and see how it runs? i dunno what to do!

 

was on a cold motor.. hasnt been ran in a week or so.

 

those are both really low...a good engine should be 90+, in the 80s and below=ready to go

 

Did you

A: Make sure someone was holding the throttle open.
B: Make sure the engine was warm
C: Make sure the battery was fully charged

?????

Cause if you didnt, you can toss those numbers out the window, they arent reliable.

 

throttle was open.. engine wasnt warm.. battery is low.. i understand that will lower them.. but how could the rear be 30-30-60 everytime.. that has to mean something?

 

if u get this soon can u get on aim jrat?

 

Cant, I am at work...

 

jrat - PM

any other input?

 

2 low numbers and one higher almost always points to one bad apex seal. Even if they were all even though, when they are that low its a very bad sign. To give you an example, my TII gets about 105 psi all around on front and rear rotors. However, it depends on what kind of tester you used. If it was a conventional gauge tester and you just watched the needle jumps, then its probably not even close to accurate. The needle just doesn't have time to come up to the correct reading before the next compression begins. Mine only jumped to an even 35 psi on each compression. The real compression was obviously much higher.

-Joe

 

if i have one cracked apex seal.. can someone estimate how long it will last before it goes? does anything specific make them go?

 

Then quit posting on here and get your *** to work!

 

bump

 

who the hell knows, we can't see what's on the inside, so we can only guess.

 

well guess then.. if its cracked.. can it just come off or does detonation need to be present to make it brake off?

 

That depends on a full charge, and proper cranking speed. If it's cranking at a low RPM, then it's not going to have as good numbers.

Oh, and if the engine's warm, the numbers will be lower. So if that's on a cold motor, and if it was cranking at the right speed, they're pretty low.

 

bump again