Is it true (compression question)?
05-30-05, 11:11 AM
#27
Building Motors
Join Date: Jun 2003
Location: Santa Clarita, CA.
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OK lets seee if I can help out here. When I test motors for rebuilding it goes like this. to start the number that I look for is 100 psi min per rotor. Well how do you get this? Like so; remove trailing (top) plugs, leave leading ones in (lower), hold throttle wide open, install compression tester into one of the holes, crank motor.
On the gauge there should be a relief valve, hold it down and crank the motor again. This will show you each rotor face pulse. Used to test for broken apex seals.
if total compression per rotor is 100 or more your good.
Auto trans cars don't like to idle if under 85.
I just fired up one that was only 60, hard to start, floods out, but does run.
If you have 19 in vac the motor should be fine, if it had a rough idle it might have a chipped seal the pulse test will show this.
Your idle looks like it needs adjusting, 600-700 too low. and it shouldn't go up and down either. Idle it around 900 and adjust the TPS.
Hope all this helps
On the gauge there should be a relief valve, hold it down and crank the motor again. This will show you each rotor face pulse. Used to test for broken apex seals.
if total compression per rotor is 100 or more your good.
Auto trans cars don't like to idle if under 85.
I just fired up one that was only 60, hard to start, floods out, but does run.
If you have 19 in vac the motor should be fine, if it had a rough idle it might have a chipped seal the pulse test will show this.
Your idle looks like it needs adjusting, 600-700 too low. and it shouldn't go up and down either. Idle it around 900 and adjust the TPS.
Hope all this helps
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2nd Generation Specific (1986-1992)
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