I compression tested my b16 yesterday and came out with these readings: Cylinder #1- 120, Cylinder #2- 120, Cylinder #3- 150, Cylinder #4- 92. I need to know if these are good numbers or not, i'm not sure what average is but I am somewhat worried about that forth cylinder. Thanks, Kevin.

 

as a general rule, the compression for each cylinder should be within 10% of the average, so I'd be worried about both your third and fourth cylinder...

is this a new engine/swap or is this an old engine?

average : 120.5
cyl 1 : 99.59%
cyl 2 : 99.59%
cyl 3 : 125%
cyl 4 : 76.67%

 

It's a 92 b16, once I get some cash I want to lose it for a newer gsr swap. I'm just making sure that it will be okay to drive for a little while without being hard on it and stopping my turbo from boosting. What is the average?

 

Judging by my results I would thing that it would just be the piston rings, anyone?

 

Help please.

 

Those results are pretty bad.

Did you do the compression test at WOT? You can tell if it's your rings because if you add a teaspoon of oil the compression will go up a little bit.

 

i just did a compression test on my b16 with 115,000 miles and it was
#1=215
#2=215
#3=215
#4=220

 

Thanks for the input do you think it would be good to drive for a short while?

 

I've got a question for ya, was the car at normal operating temp before the test?

 

you need to rebuilt that motor.
compression is way low.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondakevin21 &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the input do you think it would be good to drive for a short while? </TD></TR></TABLE>

B16's are pretty tough but you need to fix that ****.

 

Spec is 28psi difference between cylinders. Did you do the test at WOT?

If you re-do the test, put a bit of oil in the low cyl, and if the comp goes up, you have a ring problem. You can also do a leakdown test to figure out where the issue may be.

 

i get 215 across the board. was your car warm and was it wot?

 

The engine was cold and I didn't perform the test at WOT i'm going to go back and retest that ****, i'm going to rebuild my B it's just I don't have the money right now and I need it to last. Does anybody know how much having the engine being cold and not performing the test at WOT would adversely affect the results?

 

dang i tested my jdm gsr and it had 215 across

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondakevin21 &raquo;</TD></TR><TR><TD CLASS="quote"> Does anybody know how much having the engine being cold and not performing the test at WOT would adversely affect the results</TD></TR></TABLE>

I did my test without being at WOT, and got 150 across the board. At WOT it was around 210. With the butterfly closed, the pistons can't pull in air, so there's less volume to compress which leads to a low reading.

If the motor is cold, the internals haven't warmed up and expanded to specs, which could also lead to low readings.

I baleive the spec in the helms is a min of 135 before needing a rebuild.

 

I figured this would make a difference and I should have know better, thanks for the help everyone.