Mailing List flyrotary@lancaironline.net Message #65694
From: lehanover lehanover@aol.com <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Water Pump
Date: Fri, 15 May 2020 23:48:30 +0000 (UTC)
To: <flyrotary@lancaironline.net>
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I raced Mazdas for 25 years. Used the stock 12-A water pump with a 5/8" restricter in the outlet. Never a problem. Notice that the return hose from the radiator on most cars is bigger and has a spring inside to prevent hose collapse. The hose collapse comes about when the water pressure inside the hose is lower than local air pressure. When you increase flow rate and do not change the restrictions in the loop (radiator, hoses, bends, or filter) coolant on the suction side of the pump will boil. The pumps suction side will see very low coolant pressures and cavitate. In aircraft, where nearly every radiator is close to being too small this problem probably comes up more often. My cooling system worked perfectly because I used a huge coolant radiator
( very low restriction) and three oil radiators and a restricter on the pump outlet. At first I used part of a thermostat for restriction. Then a custom aluminum washer. If the washer was left out the temps went up. So I welded the washer into the outlet neck. We had two engines and the same two water pumps lasted all of that time. Shifting at 9,600 RPM.
Lynn E. Hanover 

In a message dated 5/15/2020 7:15:13 PM Eastern Standard Time, flyrotary@lancaironline.net writes:

Thanks Guys for the feedback re pumps.
Andrew, what information did you get that caused you to change to the Re-medy pump?
Was it from a reputable source, like racers? I’ve put it in the diary to call GoGear when I’m back in Perth early next week.
I have little trust in advertising these days and if I’m going to go to the trouble and expense I’d like some science behind it.

Cheers

Steve


> On 15 May 2020, at 11:17 pm, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
>
> I’ve had Mazmart Re-medy pump in since start. Seems thats been one component I’ve not had to worry about.
> Andrew
>
> --
> Regards Andrew Martin Martin Ag


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