juan82889

wats a good compresion on a b16 i got 210 150 180 200 on my b16 is that good

PooN_Lude

Typically compression tests get different read outs, what you're looking for is consistency.

That 150 aint lookin' so hot.

juan82889

so 150 is bad

BAMF

Bad? Something in your motor is fucked. That 150 is disasterous. The 180 is pretty fucking bad too, and I wouldn't be happy about that 200 either.

BTW, it depends on whats done to the motor, but 230s for stock with ~10:1 compression would be pretty normal.

juan82889

my car run fast and good and it got no leaks or no smoke

Paulino

Sounds like you may need some new rings

BAMF

If you measured properly and you have 200 in one cylinder and 150 in another cylinder, your car may not be smoking but it is certianly not running good.

Give us a little background on the motor. How many miles on it? Nitrous, turbo, anything? What kind of compression is it running? What kind of head gasket do you have and how old is it? Have you checked to make sure you don't have a blown headgasket anywhere? Who built the motor, are you sure the rings ever seated properly to begin with? How many miles on your heads? What kind of parts are in your valve train? What kind of rings do you have in it?


You're leaking compression. Its leaking from your rings, bad seal on the valves in your head, or your headgasket.

custom240sx

Make sure your battery is fully charged too while your doing these tests...if the battery begins to loose power it will turn back lower readings. Redo the tests and start with that low cylinder first and make sure you do the same routine when testing each cylinder. If tests come back that same as before drop a tablespoon of oil into that low cylinder and retest that one cylinder. If compression increases quite a bit then your rings are worn out, if it stays the same you probably have a problem in the head like a bent valve or something.

Kung.

I dont like how low the 3rd #..

My B18c was 10.6:1 around 250+ across the board.

I took info below from phearable.net, Im not sure how accurate it is but should give you an Idea of what you should be around.

* Engine compression (No more then 20psi between cylinders.)
8:1-8.5:1 c/r = 150-170 psi per cylinder
8.5:1-9.5:1 c/r = 170-210 psi per cylinder
9.5:1-11:1 c/r = 210-275 psi per cylinder
11:1+ c/r = 250+ per cylinder

custom240sx

^ those numbers are pretty accurate. My LS motor cranked out 185ish across the board and thats a 9.1:1 motor...the gsr I tested cranked out 230ish across the board.