b18b compession cylinder?

[crabby760]

my friend has a b18b and we tested his cylinder compression and all 4 of them were 120 exactly is this bad wat is his motor supposed to run at? also what can cause this it doesnt burn oil so the rings are good... wat else can cause it to run at 120 if 120 is even low for a b18b

its a 1996 b18b ls motor

[whtteg]

You did the test wrong man. The car won't even run with compression that low and if it did it would smoke like crazy. Did you have the throttle open all the way while you were doing the test? Did you crank the motor over til the gauge stopped moving?

I had a similar thing happen to me one time and it was a bad gauge, got a new gauge and had much much better numbers. You should be in the 170-199 psi range. 199 being in perfect condition and 170 being a little low. The minimum is 140, and no more than a 28 psi variation between cylinders.

Go try the test again

[crabby760]

the car runs strong idle's a ltitle ruff but when u get on it ithe motor pulls nice but yea all 4 cylinders read 120 psi.... all we did was crank the motor didnt open the throttle will go try that and see if its better

[crabby760]

we retested the compresson with the throttle wide open

cylinder 1 = 170
cylinder 2 = 155
cylidner 3 = 160
cylinder 4 = 160

how is that...?? for a b18b?

[whtteg]

Originally Posted by crabby760

we retested the compresson with the throttle wide open

cylinder 1 = 170
cylinder 2 = 155
cylidner 3 = 160
cylinder 4 = 160

how is that...?? for a b18b?

That is getting a little low, like I said in the post above the minimum is 140 then it is time for a rebuild. Also keep an eye on that #2 cylinder, if it gets close to 20 psi different from the others then a rebuild is in the near future, but like I said before the maximum of differnce between cylinders is 28 psi, but I would rebuild before that, I would rebuild around 20-25 at the most.

[crabby760]

what would be a good way to build the bottome end of a ls... for turbo