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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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