Hi Guys,
Concerning the pressure differential across the cooling baffles, this graph shows what we have to work with.
Most of us cruise around 100 Kts. 0.5 InHg = 6.80435 Inches of Water.
I measured the differential on my Onex but didn't record air speed.
The high pressure tube was routed through a blast tube and taped flat to the rear bulkhead of the baffling. The reference tube was taped to an oil cooler hose and basically just dangling in space behind the engine.
I climbed to 2000' AGL (~5000 ft DA), leveled off and throttled for 3000 RPM cruise. I let everything stabilize for about 4 minutes and then noted temperatures. Oil Temp 197, hottest CHT 327, EGTs in the mid 1200's, and pressure drop across the baffling was 6.5 in. H2O. 6.5 is what Capt. Google says is needed to cool an O-360.
So there is one more data point.
And here is a link to a study specifically targeting aero VW cooling.
https://www.mdpi.com/2504-3900/39/1/4/pdf Wes