While I see what you are saying with the volume of oil, you also have to consider that the engine is also using/heating this same oil. While my truck uses 3 gallons of oil, it's also a 6.7 liter engine heating that volume of oil. Think about an import car, they hold about 4 quarts of oil and both the turbo and the engine are working to heat that oil and there is no cooling. They turn over that 4 quarts of oil pretty quickly. In a 2 stroke turbo, the only thing heating the oil is the turbo and on a ball bearing turbo the oil pressure is really low, like 1 or 2 psi so while they only hold a 1/2 to 1 quart of oil, the oil isn't being heated by the motor, the only thing heating the oil is the turbo itself and the full capacity of the oil is being turned over very slowly. Cold starts are the hardest thing on an automotive turbo and engine, partly because the oil has drained into the pan but partly because the oil is cold and moves slowly. I understand where the theory of cooling the oil comes from, but isn't that the job of the coolant we pump through the turbo? I guess what I'm asking is, is there any solid engineering or testing that has proven that cooler oil is better for a turbo than warm oil?
I don't want to totally pollute this thread with this topic, I'm not trying to say that push has it wrong. I only put it here because it's a selling point of this turbo and I have questions about it. If we need to move it to another thread as not to derail this one I'm fine with that too. It seems that the turbo manufacture and some of the kit builders have a different opinion about whats best for the life of the turbo, I'm just wondering if the theory's that are being used by kit builders are supported by any real world testing/engineering and if so, what are the results of that testing/engineering? Again, not turning this against push.....they are not the only builder doing this.
