Hey i have an eg with jdm b16a recently i took a compression test on the warm engine after running for 10 mins. then i came across to those number

Cylinder 1: 160 cyl 2: 170 cyl 3: 185 cyl4: 185


im wondering why is that, if it does tell anything about the engine?

also after completing the test, i also see some whole lot of oil on spark plugs thread and tip, but it was running fine before, after testing the oil came on spark plugs, and now it runs funny like when giving gas it would stall and jerk a bit.

 

More details, estimated milage? whats been done maintenance wise?
A compression test doesn't change how your engine will function if you put everything back together properly (aka, plug wires in the right holes, etc.)

 

140 is the service limit so you're getting to the end of it with 160 etc anything below 200psi and you'll feel it, optimal is 240 factory rated is something like 260-270psi. was this a "dry test" I hope you unplugged the distributer and especially the fuel injectors.

 

the mileage is about 60k on it. just complete dead stock.

im going to check and make sure that everything is placed properly.

prior to compression test, i did removing the fuel pump fuse number 24 under the dash 15amp. oh i thought i forget to WOT (wide open throttle) valve. so if i did that, that should bump up the number a bit right? that was all i did prior to testing.

 

Maybe 15psi if you're lucky not a big difference tho hack even cold my b20v pushed 240psi per cyl, warm and at wot it did 253...

 

well 15 psi more is definitely better than being 160, so possibly i will get 175

 

just do it again the right way and come back with the results.

make sure it is warm/up to temp. 6 cranks, wide open throttle, id also just unclip fuel injectors and distributor plug.

most stock vtec motors ive tested with my tester come out around 200-220 psi