Hans Conser wrote:

I spent two summers sucking water out of lakes, and our gasoline pumps
did the same thing:  They would cavitate unless you restricted the
output.

Hans Conser

In this case the pump is the primary load on the gasoline engine.
In the case of the Mazda the water pump is a minuscule load.
Also the Mazda pump is of course a closed loop system.

Paul Lamar

Tracy Crook wrote:

FWIW,  Just had another thought on this subject.  I think I agree that inlet
restriction is the most sensitive parameter on these pumps.  If you think
about it, the inlet will "see" a greater pressure drop if you reduce the
backpressure (or restriction) on the outlet side regardless of whether its a
closed or open system.

I'm not really arguing for more outlet restriction, just trying to
understand the basic principals involved here.   In general, more flow is
better than less flow.   OTOH, I haven't seen any real need to do anything
about the flow in my airplane.  It seems to be adequate even at WOT.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org