James Russell wrote:

Hi all:

        We would always remove the thermostats in any racing car and

replace

it with a stainless steel plate w/ a hole about the size of the
thermostat opening. If
we forgot the restrictor plate, the car wouldn't cool. Formula cars
w/ double pass rads,
25% antifreeze, etc. Just my 20+ year-old memory, YMMV, : )

Regards,
James

My "mileage" was the same as yours James :)  Some of the racers in the old
days thought it was the "slow the water down so it had time to cool in the
radiator" effect, which is of course wrong.   I believe that waterpump
cavitation was the culprit without the restriction of the plate, but
everyone seems to have their own theory on this.   Don't know if the Mazda
13B pump would have this problem at our speeds (< 7000 rpm) or not.  It is
far superior in design to the crude bent sheetmetal impellers in the
american car pumps that I'm familiar with.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

I think you can get the same effect on the pump by increasing the 
overall system pressure. Continental  so stated in their excellent
SAE paper on water cooled air craft engines. They run 50 psi rad caps.

Paul Lamar
 
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