120 - 140
100-125 psi
150 psi should not vary by more than 10 psi between cylinders
100-125 psi
typical compression test reading fora diesel engine
140-150 lbs.
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
The average compression test reading for a Porsche 911 2.7L engine typically falls between 145 to 165 psi across all cylinders. Readings that are consistent and within this range generally indicate a healthy engine. Significant deviations or low readings in any cylinder may suggest issues such as worn piston rings or valve problems. Regular compression testing can help in diagnosing engine health and performance.
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?