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Low oil Pressure at idle

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Old 09-02-17, 10:38 AM
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Low oil Pressure at idle

I have a freshly built 20B with a brand new oil pump and internals. When I start the engine, I have great oil pressure readings (30-40 psi). After the engine warms up to operating temp, the oil pressure drops (18-22 psi) at idle. I am a running SPA oil pressure gauge which I am reasonably sure is accurate. I have dual oil coolers only (no mocal oil thermostat). Any ideas? it has plenty of oil and is not leaking. I dont know if I a missing something.
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Old 11-10-17, 08:22 PM
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assuming your cold idle is higher than idle at operating temperature, perhaps the issue is your oil seal between the front cover and the front housing.
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Old 11-11-17, 01:31 AM
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just a thought but oil does get thinner when it heats up..so maybe that is why the PSI drops.
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Old 11-14-17, 06:35 AM
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Something very wrong, my 20B cold start oil pressure is 125 PSI @ 800 rpm
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