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They also have air filters

Just curious if someone has tried a Costa filter. Specs seem good: https://racing.costafilters.com/blog/racing-oil-filter-engine-builder-recommendations

It may have been missed that my conclusion was that it was not the mixing of oils but it was too much oil that was causing aeration and pressure drop. I will delete this thread soon

Correct. I think the windage screen was not correct for this particular set up

Appreciate the answer. But the oil pan is a 6 quart pan. I added a full-length close-fitting louvered windage screen. I had 6 quarts in it, the required amount. I was not expecting to have to drain oil out.

No but I was able to solve it but taking a quart of oil out.

Well I can confirm, it's not the mixing of oils that is at issue. So mix away!

My drop looks very similar to what the Engine master guys saw while testing oil pans and oil level. There are 2 good videos if interested. Their issue was worse than mine so I decided to remove a half qt. Will hopefully testing resume tomorrow.

With the iron content it looks like the motor is still breaking in

They might not fail but there will be a pressure drop across anything that flows and is a restriction. That pressure differential is a function of the flow rate (proportional to the square root of pdiff). And the higher the flow rate that is forced thru it, the greater the pressure differential...

Actually they do have a flow rate, it's a matter of at what pressure across it? Any restriction, whether it's a filter, an orifice, valve, fitting etc will have a characteristic flow rate vs pressure curve. The higher the flow rate, the higher the pressure differential across it (pressure drop)...

So I noticed the issue only appears at elevated oil temperatures. From room temp to 230f oil expands about 7% or in my case almost half a quart. We are testing again soon so I will take out a half a quart to start with and see how it goes. That may be the real issue (windage and aeration from...

I did but nothing stuck out as unusual

Thanks. Unfortunately no, those things would have to be modified to fit.

You may be correct about it aerating due to crank churning the oil. We are still testing so I can try to lower the level (we noticed later in tests that the 100% Mobil 1 0W40 still dropped about 2 psi only when the oil was like 240F). The engine is a Buick 482, makes 610 ft lb/ 600 hp. The pan...

Yes, but why would it drop and come back?

I think that the odd mix was causing foaming bc we saw the same issue when just free revving with no load

Well I mixed oils thinking I was making things better. I am dyno testing my engine and after break in which went great, I changed the oil and filter. I used 3 qts Mobil 1 Euro 0W40 and 3 qts Quaker State All Mileage 5W30 with Microguard Select VAFI filter. We noticed the oil pressure would drop...

Looks like BT112 does not have the ADBV

That's what I ended up with