Engine guru question!
#1
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Engine guru question!
Hi knowledgeable crew!
friend of mine has 200 hours on a full rebuilt 500 efi, never went past 4k rpm except last week end
after keeping it around 4300-4500 for 2-3 minutes, oil pressure started to drop to close 20 on dash gauge in 5-7 seconds so he shut the engine off
put a mecanical gauge and did the test and read down to 27
so whats thr problem? Warming up opens up clearances? Where? I would of think it would become tigher with higner temps, not loose... suggestion?
friend of mine has 200 hours on a full rebuilt 500 efi, never went past 4k rpm except last week end
after keeping it around 4300-4500 for 2-3 minutes, oil pressure started to drop to close 20 on dash gauge in 5-7 seconds so he shut the engine off
put a mecanical gauge and did the test and read down to 27
so whats thr problem? Warming up opens up clearances? Where? I would of think it would become tigher with higner temps, not loose... suggestion?
#2
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Oil thins out as it warms up. Thinner oil = less oil pressure. Should have a bare minimum of 10 psi per 1000 rpm. Probably have some sloppy main bearing clearances. Disclaimer: I am not a Guru.
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PigNaPoke (08-25-2021)
#5
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iTrader: (6)
did the oil pressure dropped to 20 psi after coming off plane or while at 4500 revs
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Craney (08-25-2021)
#9
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iTrader: (6)
what is normal ? whats the swing from normal to 20