Re: IML: oil pressure

[sosmi@xxxxxxxxxxx]

That doesn't sound good, a fresh engine should have 30-40psi at idle(650-750RPM) with SAE30 oil. If you have a mechanical gauge on the engine, and your reading 10psi at idle, thats low.It's possible the relief valve in the oil pump has some trash in it, holding the valve open, thus by-passing the oil, and reducing the pressure.If the pressure is good at cold start-up(40-50) at idle,then drops off after warm up, then it's probably bearing clearance, it also could be excessive lifter bore clearance, but thats not too common.When you buy bearings they are SHOT GUN SIZED, they work, but in many cases they end up with too much clearance (.002-.003)We buy special bearings and can fit to exact specs.I hope you washed, and cleaned all components after machine work, they may look clean, but there is always grinding, and metal dust left in oil passages, and cylinder bores. It won't take long to destroy the engine, if it wasn't cleaned completely. Ya'll have a nice day, Dave

 

> -------------- Original message -------------- 
> From: "Robin Giesbrecht" <robings@xxxxxxxxxxx> 
>
> > 
> > 
> > 
> > 
> > Wondering if anyone has ideas on why the oil pressure on my 1972 440 
> > Imperial would fluctuate from 10 psi at idle to 40 psi at highway speeds 
> > with a surge in pressure of 10 psi when throttle is lifted. Engine is 
> > rebuilt with all new crank bearings and cam bearings and oil pump. Using 
> > after market oil pressure gauge. I put a supposedly hi pressure oil 
> > pressure relief spring in also(black) but am wondering about it's quality. 
> > Engine runs great and no rattles or strange noises. 
> > 
> > Robin Giesbrecht 
> > 1972 Imperial 
> > 
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