Compression numbers Question
#1
Compression numbers Question
OK so I removed the entire engine and transmission out of the car. I hooked up an oil line from the filter pedestal to the return line below crank pulley. I hooked up a battery to the starter and did a compression test using a piston engine tester.
Engine cold.
225-250 rpm it shows 65 psi for the rear and 95 psi for the front.
I squirted a little 30W mineral oil and
rear showed 90 psi but you can tell the pulses were uneven. Front showed 120 psi.
I know the rear lost compression (cracked apex seal?) so the engine needs a rear housing and seals.
Question: Is this normal to get 20% higher number just from squirting a little oil? Is this normal?
Engine cold.
225-250 rpm it shows 65 psi for the rear and 95 psi for the front.
I squirted a little 30W mineral oil and
rear showed 90 psi but you can tell the pulses were uneven. Front showed 120 psi.
I know the rear lost compression (cracked apex seal?) so the engine needs a rear housing and seals.
Question: Is this normal to get 20% higher number just from squirting a little oil? Is this normal?
#2
Rotary Enthusiast
iTrader: (8)
OK so I removed the entire engine and transmission out of the car. I hooked up an oil line from the filter pedestal to the return line below crank pulley. I hooked up a battery to the starter and did a compression test using a piston engine tester.
Engine cold.
225-250 rpm it shows 65 psi for the rear and 95 psi for the front.
I squirted a little 30W mineral oil and
rear showed 90 psi but you can tell the pulses were uneven. Front showed 120 psi.
I know the rear lost compression (cracked apex seal?) so the engine needs a rear housing and seals.
Question: Is this normal to get 20% higher number just from squirting a little oil? Is this normal?
Engine cold.
225-250 rpm it shows 65 psi for the rear and 95 psi for the front.
I squirted a little 30W mineral oil and
rear showed 90 psi but you can tell the pulses were uneven. Front showed 120 psi.
I know the rear lost compression (cracked apex seal?) so the engine needs a rear housing and seals.
Question: Is this normal to get 20% higher number just from squirting a little oil? Is this normal?
Yes.
#3
Turd Ferguson
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Join Date: Jul 2006
Location: Sherman Oaks, California
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it is.. it's a common technique we use when we de-flood rotary engines. squirt of ATF into the plug hole UPS compression in order to get it starting again.
Sooo as dguy say, yes that is normal.
Sooo as dguy say, yes that is normal.
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trickster
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07-01-23 04:40 PM