The other day I got the ambition to test my b18c1, and through the first three cylinders, I was very satisfied. 225-220-220 psi at 5 cranks. Then I get to #4. The first two times I tried, it wouldn't build compression past 125; the needle didn't jump for a crank or two when I tried those times. Finally on the third time it jumped normally and went to 175 at the fifth crank. It doesn't blow black smoke, but I tried a wet test on that cylinder anyway. I put what I thought was about 1.5 ounces of oil in, but apparently it was too much since oil went back up into the tester, and the gauge read off the 300 psi range.

So, I was unable to confirm the rings on that cylinder are shot because my noob *** probably trashed the tester. If the cylinder fails to build compression during random compression strokes, the rings are most likely completely toast, right?

 

If the compression does go up on ur wet test then the rings are likely bad. The only way to properly diagnose this is with a leakdown tester. See if u have a friend with one or go to a shop to get it done. With the amount of leakage u have sounds like rings are bad though it could be something else. U notice ur engine ever burning oil? Any other problems?

 

post some pix brotha real good info for techers

 

The thing about the wet test is oil went all up into the tester, so the result wasn't accurate. God knows how high the pressure really was with the oil in there; the needle went past the 300 which is as high as it reads. Every time I let the air out of the valve, oil bubbles came out too

Maybe next time I'll have somebody hold the leak valve open on the tester while I crank it and force out all the remaining oil lol.

 

So i did a compression test on my 96 integra gsr. I had just driven it over 130 miles with a new exedy stage two clutch put in & 10lb flywheel...
so the motor was definetly at operating temp. 115,000 miles on motor.

so i pretty much had this car a month and wanted to check the compression.
it read 180-190, after a long drive.
The car seems like it has good streetable power, but dont my numbers seem low?
I know that you can have a "BURP" in the fuel system to get a surge of presure. so are people cranking their motors to many times, shouldnt 4 cranks be good enough...?

Can someone enlighten me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deegz &raquo;</TD></TR><TR><TD CLASS="quote">So i did a compression test on my 96 integra gsr. I had just driven it over 130 miles with a new exedy stage two clutch put in & 10lb flywheel...
so the motor was definetly at operating temp. 115,000 miles on motor.

so i pretty much had this car a month and wanted to check the compression.
it read 180-190, after a long drive.
The car seems like it has good streetable power, but dont my numbers seem low?
I know that you can have a "BURP" in the fuel system to get a surge of presure. so are people cranking their motors to many times, shouldnt 4 cranks be good enough...?

Can someone enlighten me </TD></TR></TABLE>

It doesn't really matter what the numbers are, as long as they are consistent and above like 140 psi. Testers are different and give different results as well. Don't worry, my old LS put out 150 in each cylinder it was still healthy enough to run 15s, not bad for an LS. You are looking for consistency. I would much rather have 180-190 across the board than 225 for three and 175 for one

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Uncle Ben’s &raquo;</TD></TR><TR><TD CLASS="quote">The thing about the wet test is oil went all up into the tester, so the result wasn't accurate. God knows how high the pressure really was with the oil in there; the needle went past the 300 which is as high as it reads. Every time I let the air out of the valve, oil bubbles came out too

Maybe next time I'll have somebody hold the leak valve open on the tester while I crank it and force out all the remaining oil lol. </TD></TR></TABLE>

Can you remove the one-way valve from the plug adapter on your tester? That could allow for the oil to drain from the tube. Most "wet" tests that I saw recomend about 1 tsp of oil be added to the cylinder to seal the rings. BTW: 1 fl-oz = 29.57 cc. The stock B18C1 has about 43 cc of compression volume.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">Can you remove the one-way valve from the plug adapter on your tester? That could allow for the oil to drain from the tube. Most "wet" tests that I saw recomend about 1 tsp of oil be added to the cylinder to seal the rings. BTW: 1 fl-oz = 29.57 cc. The stock B18C1 has about 43 cc of compression volume. </TD></TR></TABLE>

LOL. I will take a look at the tester sometime soon; right now it's in my mother's garage but I don't think I can take it off IIRC. I took the hose off the adapter and whipped it around and slung some oil out of it, but the result was the same. I didn't think amount of oil would completely seal the piston rings around. Does the compression force the oil to evenly distribute, or what?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Uncle Ben’s &raquo;</TD></TR><TR><TD CLASS="quote">Does the compression force the oil to evenly distribute, or what? </TD></TR></TABLE>

The oil is a liquid and the rings are the lowest point in the cylinder. You need to add just enough oil to wet the rings and temporarily seal any leaks.