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ronbarn

Oil Pressure Problem

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The following sequence happens when starting a car (make and year not mentioned at this time since it is probably not important):

1. Car starts fine and at idle oil pressure goes to 30-35 psi which is normal.

2. Start moving the car and under acceleration the oil drops to near zero.

3. Go back to idle and the oil pressure picks up.

4. After running for a while and warming up, the oil pressure settles out at 30-35 psi.

Is there a problem? What is the problem? Is there a potential for engine damage during the low pressure cycle? Ron

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Depending upon the car. Some of them had a screen half way up in the oil pan. If it gets clogged the cold oil will get pumped up but is slow to drain through. Once it is warmed up it flows through okay.

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Had a similar problem a few years ago with a customer's truck. Turns out, using the "if one can is good, more is better" theory, he had overdosed his engine with oil stabilizer products. This effect was seen in cold weather though.

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Does the car have to be actually moving to lose pressue or will reving the engine in neutral also cause pressure drop?........Bob

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Guest imported_JPIndusi

Cold oil too slow in draining back down to oil pan?

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Good suggestions. When the owner called me I suggested that he install a temporary independent guage to give him a check of the permanent guage. Have not heard back from him. The cold oil suggestion may very well be the problem - the car is in Australia and it is their winter at this time. Will ask him to check the screen in the pan - there is no filter on this car (1927 Marmon) unless he installed an aftermarket unit. Thanks, Ron

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When the oil pressure drops, does the engine make any noise? Tapping, etc? If not, it might just be the gauge.

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