Topic: Lower compression on two cylinders

[STi.PHa]

Hello WSC members,

Compression test #
#1 - 120, #2 - 100, #3 - 120, #4 - 100

Just curious to what may cause lower compression in cylinder #2 and #4? Just seems weird that both cylinder that are affected are on the same side of the engine. The car runs find with no misfire at all. Car has forge piston and just got head rebuilt with new valves/seals and has BC 272 cams installed. Would like to look into possible causes.

Any thoughts or ideas to as why this may be? Thanks in advance.

[diamondedge]

Did you do the test yourself? Cold or warm engine? If you started on one side and then there was a significant cool down of the engine between sides that could
explain it.

[SlowLGT]

How about a leak down test?

[STi.PHa]

Did you do the test yourself? Cold or warm engine? If you started on one side and then there was a significant cool down of the engine between sides that could
explain it.

Test was done by someone else. I'll do the compression test again, maybe i'll start on the side with lower compression first. Appreciate the help.

How about a leak down test?

Didnt do a leak down test yet, was looking in possible cause first. Will definitely consider it thanks