Now, that's an 11 row cooler, and single pass means the oil is flowing unidirectionally through the 11 rows...
The mazda is a 6 row, and oil goes both way (only 3 rows flow each way).
So the cooler you pictured, flows 4x more easily than a mazda due to 4x less internal resistance. (11 fins to 3 fins)...
I betcha on that cooler the choke point was the AN12 fitting... the cooler probably had little resistance...
The 930 pump probably flows a bunch more oil than a SC motor too, I suspect...
Will try to look inside the cooler this weekend to see how big the passages are in the "rows" in terms of height. 1mm? 2mm? 2.5??
If they are 2.5mm, then their flow area Is the same as the AN fitting, so not an issue...
Next, I try to figure out how many angels fit on top of a pin head
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You mention that the pressure relief valve might be 100 psi? That seems awefully high... Are oil radiators even rated that high for safety? I figured it might be 30-40 psa, because the return oil line drains to the oil tank, which is "open to ambient air."
The only way you would come close to generating 100psi, I would think, is if the oil line is completely crushed...
Bo