Water Pump Flow Rates Quantified

<Snip!>



According to Bill Carroll Rotary Engine Manual page 148 the pump is
254 US pints per min max or about about 32 gallons per minute. My 13B
Cosmo manual on page T:2 in the appendix says 42 US gallons per minute at

engine RPM. The pulley ratio is 1:1.8. It is amazing that Power
Sport was able to increase the capacity of the stock pump by 50%.
How exactly did you do that Ray? If you calculate the area of all the
tubes in the stock radiator it comes out to be much much larger than
the area of the feed pipes. Radiator restriction I suspect is less
than block restriction.  Did you mill out the restriction
in the pump outlet from the block  as shown in this picture?

Paul Lamar


Tom Kendall wrote:


Lesseee...... 51 gpm in a 1" ID hose (and I'm guessing that's really 1"
nominal or OD, not ID)... that's just a nudge above 20 fps.  Howlin'!  I
suspect that at that rate there would be a huge pressure drop in the
circuit.  The water pumps are centrifugal pumps.  As the flow rate goes up,
the pressure produced by the pump goes down (and cavitation becomes more of
a limiting factor too).  Somethin' just doesn't figure here.  How are were
the flow rates measured?  Has PowerSport run a heat balance / calorimetric
on the engine, rad, or oil cooler?

Tom Kendall
(Tom.Kendall@att.net)


 
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