how good the starter is, how fast the motor spins, motor oil type (yeah I went there), are the valve rotators working? valves adjusted, motor temp? outdoor temp, altitude of engine at testing, type of compression tester, location of the compression tester connection... etc etc etc...

I've seen 535psi on some well worn motors that were well maintained, and serviced recently, and I've seen 200 reliably start with zero blowby and good glow plugs...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!