> Paul,
> Do you know if anyone has tried a better water pump? By that I
> mean a separate engine driven after market pump. I have found at least 2
> examples Mazarre (sic) makes a engine driven pump intended to replace a
> standard pump on a V-8 chevy. They have a performance chart for the pump
> on their site explaining that the pump requires about 4.8 HP to
> move 60gpm "with normal engine back pressure." They do sell the
> electric water pumps, but only claim they are good for drag racing, NOT
> for road use. As we have told people forever it seems. 5 HP sounds about
> right on their engine driven pump if they are moving that much water
> without cavitation. The Wisconsin powersport guys said they had tested
> the standard second gen pump and it was topped out at 53 gpm at the
> verge of cavitation. I wonder if we could move more water and solve that
> problem? I also like the original PowerSport efforts into center feed
> cooling. That seems like a better idea over all if you are going to run
> at those power levels. Perhaps Steve might tell us if that was ever
> followed up on?
> Bill Jepson
>
> Cooling with a 2nd gen pump is just not a problem for aircraft use.
> Mark Steitle with the installed thermo couples is not reporting
> any problems so far. Mazda data at 7000 RPM has the "cylinder head" >
temperature
> 100 F lower than a water cooled Continental aircraft engine like the one
> that went around the world in the Voyager.
>
> There is an after market pump that Jim Mederer used on one of his
> 1200 HP turbo 3 rotors. It is used on 800 HP sprint cars and it is
made by > KSE
> as I recall.
>
> Changing the cooling system from series to parallel As P.S. attempted
and > NSU
> used would be a worth while thing to do but it is near impossible
without > a
> complete redesign of the engine. The fact of the matter is nobody,
unless > they
> are building a Reno racer, are going to demand much over 300 HP as
they > don't
> want to burn the fuel.
>
> Paul Lamar

Bill,
What RPM was that 53gpm, I'm hoping cavitation would be higher than our rpm
requirements, over 7,500 rpm?
George (down under)

George,
I was talking to Steve Winzerl about the water pumps. He is the guy
that is supposed to have done all the calculations on tortional
vibration on the later powersport gear box. He did not mention the
RPM at which they got 53GPH. His only comments were that 5hp to get
60GPM was close to the values they got in testing.
Bill Jepson

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