150 psi should not vary by more than 10 psi between cylinders
The average compression test reading for a Chevy 350 small block engine is around 150 PSI. Lower pressure indicates that there is a leak in the engine.
100-125 psi
120 - 140
100-125 psi
typical compression test reading fora diesel engine
do it with engine warm for better sealing, pull all the plugs so it is easier on the starter and disable fuel for the test
140-150 lbs.
If the difference between the high and low reading is within 10%, it is withing normal specification. If more than 10%, try squirting oil into the low cylinder and retest, if compression comes up , this indicates a bad ring, if not indicates problem is a bad valve.
Hi,iv'e got a 4hf1 Isuzu. What will the correct compression reading be if i do a test on the engin?
Maybe it has no compression--take compression test
Hi,iv'e got a 4hf1 Isuzu. What will the correct compression reading be if i do a test on the engin?
Hi,iv'e got a 4hf1 isuzu. What will the correct compression reading be if i do a test on the engin?
Yes, a pregnancy test would show a true reading.