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I would appreciate any sanity check that anyone has to offer, but based on these numbers I don't think my original plan would be optimum. From the equations on the above referenced page, the biggest contributor to the backpressure is the flowrate as its value is squared. Questions for the list.
How does the cooling performance drop as the flowrate goes down?
Is 20cfm the very minimum flow necessary to provide adequate cooling?
I don't have much of an idea on that answer. Everything leaving my stock water pump goes through a 5/8" hole with sharp edges in and out. I should reduce the water out hose size to under 1 inch ID, just to reduce the weight involved. If I was doing it again, I would use a 1 inch inlet into the radiator. The suction side I would not change. When using the Harrison cores for a water radiator, I used school bus heater hose, and I think that was 1 inch ID. When turning the water pump three times the stock RPM (or more) it becomes very effective. I have never calculated the pump RPM when we shift at 9,500 crank shaft RPM, but it seems adequate. Racing water temps are 160 to 170 degrees.
Lynn E. Hanover
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