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bpu699 bpu699 is offline
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Join Date: Apr 2007
Location: wisconsin
Posts: 2,307
High idle oil pressure, low at higher rpm? Causes?

My 930 has an odd oil pressure pattern...

This site is full of answers for low idle oil pressure. That could be anything from bad bearings, bad oil pressure relief valve, or plain old worn oil pump...

But what causes a great idle pressure, that barely moves as you add gas?

My 930 has 2.5 bar at 1000rpm warm. That's 37 psi or so, I believe.

As I add rpm, it climbs to 3 bar by 2000 rpm. 4 bar or just about by 3000 rpm... And then stays there to 6000 rpm. That's 60 psi, so it ain't bad....

But I just can't figure it out. If it had a bad oil pump or bad bearings, the idle pressures would be crap. Right? Most guys seem happy with 1 bar at idle... I have 2.5! I checked with a manual gauge and it's pretty accurate.

I thought it might be a bad oil relief valve, so I shimmed the spring. Made no difference.

Anyone have thoughts? Added oil restrictions, not convinced it made a difference. Motor runs great, brad penn oil.

I would think that bad bearings would cause low oil pressure throughout? Right? And wouldn't it be proportional to rpm? What causes an oil pressure to plateau? The only thing that makes sense to me is an oil pressure relief valve...but that doesn't seem to be it...

Old 02-23-2014, 02:39 PM
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