Boarder Line Low Oil Pressure

Abodysrule said

It's running 10-12psi/1000 rpm, so maybe 25 psi at 2000rpm. My slant six (build by Doug Dutra) had 70 psi cold, 50 psi at 2500 rpm, and 30 psi at idle hot, but he built the oil pump and we used like 0.004" on the bearings when we built it.

I'm less and less worried about this pressure, seeing that it is very common in these magnums apparently.

It's just weird that it is really good pressure when cold, at all rpms, but drops so much once warmed up. Again, I may swap to 20W-50 when I change the oil next, just to see how it behaves. I'm not too worried after reading up on this and getting feedback on this forum.

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That seems a little low, but understand, I don't have what I'd call a ton of experience with Magnums. I've built several, but for other people. I always use high volume oil pumps.

Yeah, slants usually have a lot of oil pressure when done right. Mine idles at 75 cold and the only reason it's not higher is because the relief valve is open. When it's hot, it idles around 45-50. As soon as you blip the throttle at all, it zooms up to about 75 and stops like a rock right there, because the relief valve opens. Otherwise, it'd run right on up to 100...or whatever. lol I don't run a high volume pump in a slant, just a standard volume pump with the high pressure spring.

I wonder if the high pressure spring might help with your issue. Not as easy to get to as the slant, but it might be worth a try if you decide to do something.