iBrandon

cylinder (Dry):

1) 220
2) 225
3) 227
4) 220

Cylinder (WET, one cap of oil in each)

1) 275
2) 270
3) 275
4) 275

Whats going on??? Motor has 5k on it now...Fully built Gsr engine, ready for boost, 9:8 je pistons, 81.5 bore, running N/A currently....Losing about 1-1 1/2 quarts every 1000 miles....No oil leaks, no smoke, only a very hint of smoke at high rpms, but hardly hardly noticable...

Shouldnt the rings compress the oil that was poured into the cylinders?? From what i understand, the compression shouldnt raise if little at all from the dry compression test... And is it common for all cylinders to have similar wet compression numbers??? Im puzzled and dont know what to do...mite end up tearing it down and redoing the rings...

Other insight would be helpful!

s2kdre

i had the same problem with a built motor, i think the clerances aint tight enough between the walls and the rings.

Boosted Chemist

iTrader: (1)

those are good numbers my b16a, (9:1 + shaved head) was like 180 across the board after my build

iBrandon

i just now thought of something, our pistons being boosted is either flat or a slightly dished in....so if you pour oil on top of that...how is the oil suppose to move to the edges to be compressed?...

I can see how high compression, dome pistons will benefit this more then a turbo piston...so if its not moving to the edges then naturally the compression will increase...im assuming this...so wouldnt a wet test be feutile?

If my exhuast is burning clean, and not smoking like it did when i put the spark plugs back in, it was smoking grey smoke and took a little bit to burn off the oil out of the cylinders, then i dont see how it can be the rings...

but my oil is going somewhere, maybe theres a leak i overlooked....but if the compression are exactly same when i put oil in it...something is not right, testing wise....so im guessing i did the wet test wrong, or its completely useless????

I will do a leak down test tomarrow, and i should know what the hell is going on hopefully....