From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Water Pump
Date: Sat, 16 May 2020 08:08:53 +0800
References: <list-244221@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-244221@logan.com>
Message-Id: <D0C34D8E-CA52-4D48-B346-113B855AE153@gmail.com>

Thanks Lynn.=20
So cavitation is not simply solved by impeller design but system wide =
considerations of pressure.
Cheers
I=E2=80=99m trying to eek out any small % increases in cooling =
efficiency for our hotter summer months and wondered=20
if the Re-medy pump would provide any benefit at our take off and climb =
at 7250 rpm.

Steve Izett


> On 16 May 2020, at 7:48 am, lehanover lehanover@aol.com =
<flyrotary@lancaironline.net> wrote:
>=20
> 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 =20
>=20
> In a message dated 5/15/2020 7:15:13 PM Eastern Standard Time, =
flyrotary@lancaironline.net writes:
>=20
> 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=E2=80=99ve put it in =
the diary to call GoGear when I=E2=80=99m back in Perth early next week.
> I have little trust in advertising these days and if I=E2=80=99m going =
to go to the trouble and expense I=E2=80=99d like some science behind =
it.
>=20
> Cheers
>=20
> Steve
>=20
>=20
> > On 15 May 2020, at 11:17 pm, Andrew Martin andrew@martinag.com.au =
<flyrotary@lancaironline.net> wrote:
> >
> > I=E2=80=99ve had Mazmart Re-medy pump in since start. Seems thats =
been one component I=E2=80=99ve not had to worry about.
> > Andrew
> >
> > --
> > Regards Andrew Martin Martin Ag
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
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