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One is on the oil pump and this regulates pressure within the block. But the other is on the oil filter hangar and it is just before the line that goes to the oil cooler. Without actually knowing what the trigger pressure is for that valve, I couldn't tell you at what point oil actually circulates, but it does appear as though you could definately be correct. Perhaps at idle there is not enough pressure to actually overcome the valve, therefore no oil circulates through the cooler. One thing I didn't check on that valve is whether or not the spring in there is a thermally reactive spring. Perhaps at higher temperatures it's "k" value changes (lowers) and the valve opens, kinda like a thermostat. What I will do to confirm this is once I get the engine in, I'll disconnect the hose and have someone crank her up to see when oil flows. Process:
Start cold - idling: check for flow
cold - 2000rpm: check for flow warm idling: check for flow
warm 2000rom: check for flow You get the idea. I am sure this process will tell you whether or not it is a thermally reactive spring or if it is just a standard spring - this would mean it is merely a pressure sensitive valve. I DO want to know because why run the engine at idle for 2 minutes if oil isn't flowing anyway? : ...cooler.
: i've seen it both ways...that at idle, no demand...oil does not circulate through either the turbos or the oil cooler. I forget which.
: so, in theory, a turbo timer is a waste. : but i have no data to back anything up. : does oil flow through the turbos always, so long as there is oil pressure?
: does oil flow through the oil cooler alwyas, so long as there is oil pressure?
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