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Thanks for the link and the short explanation. That all makes sense. The Cyber Evo from the time attack series has its oil cooler mounted sideways (ports on left side and most every other car has their coolers mounted with the ports on top.
The reason I mounted the cooler like I did was because of clearance issues. Basically, without welding anything I was able to position the cooler in a way that it cleared the cold pipe coming from the front mount, with the downward facing fittings of the oil cooler on either side of the pipe.
I thought about putting in a bleeder bolt at the top of the cooler and some check valves, but even that wouldnt make it better; especially with a thermostat that slowly opens and closes.
So assuming there is air at the top of the cooler (which is most likely the case), once the thermostat opens there is an initial drop in pressure, due to the oil entering added oil passages (tubing and cooler). Then there is probably an air pocket at the top of the oil cooler, which is preventing the oil cooler "system" from completely filling and achieving normal oil pressures. The added oil pressure at WOT most likely compresses this airpocket enough to achieve "normal" oil pressures at WOT.
Does this sound correct? After I reorient the cooler, should I step the hoses and fittings down to an -8AN? or do guys think it would be okay to retain the -10AN with a stock oil pump?
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