thats compression ratio lolstock is 9.85 I believe
oops lolthats compression ratio lol
he wants to know the PSI for compression check. I believe it is supposed to be greater than 160 PSI and each cylinder has to be within 10 psi of each other per bank. I'll try to remember to look up the spec tonight when i get home.
Just looked at my ford service manual...it states that the lowest pressure level must be atleast 75% of the highest pressure level. Hope this pastes ok...
Ok it didnt paste correctly and dont have excel or word on this computer. Here are some examples...
134 PSI max needs a minimum of 101 PSI...in other words cylinder 5 could have the most pressure at 134 psi...the lowest pressure any other cylinder could then have would be 101 PSI.
Heres some more numbers...
This is how ford says to do the test
Compression Test—Compression Gauge Check
- Make sure the oil in the crankcase is of the correct viscosity and at the correct level and that the battery (10655) is correctly charged. Operate the vehicle until the engine is at normal operating temperature. Turn the ignition switch to the OFF position, then remove all the spark plugs (12405).
- Set the throttle plates in the wide-open position.
- Install a compression gauge such as the Compression Tester in the No. 1 cylinder.
- Install an auxiliary starter switch in the starting circuit. With the ignition switch in the OFF position, and using the auxiliary starter switch, crank the engine a minimum of five compression strokes and record the highest reading. Note the approximate number of compression strokes required to obtain the highest reading.
Compression Test—Test Results
- Repeat the test on each cylinder, cranking the engine approximately the same number of compression strokes.
The indicated compression pressures are considered within specification if the lowest reading cylinder is at least 75 percent of the highest reading.
If any cylinder fails, squirt a tablespoon full of oil into the questionable cylinder then repeat test.