Ramon Collado. wrote:

Paul, if I install a rad on the lower part of the wing or in the inside of
my fuselage, will the water pump do its work without any other help????
Thanks

Ramon

IMHO Yes. There is very little change in the pressure head.

There is a high eff. racing pump available from R-Beat.
The stock pump and racing pump are limited to 6300
engine RPM with a 1.18 pulley ratio. If you run
your engine higher than this with a 3:1 PSRU you might
want to go to a 1.02 ratio. The upper limit according
to racing beat is 7400 pump RPM.

A hidden advantage of the racing pump is it moves
the alternator to the right side of the engine giving more
clearance under the cowl.

Also if in doubt. I would ground test the system by running 
the pump with an electric motor (a drill press, mill or lathe) 
and lower the bucket it is sucking from and determine 
the length of time it takes to pump five gallons. 
The spec on the 12A is about 30 gallons per minute 
so I would guess the 13B would need at least 40 gallons 
per minute. Since that is for car use
I would suggest upping it somewhat for aircraft use
if you can find a suitable pump. Racing beat is using
a sprint car pump on the three rotor but so far
I have not been able to determine the source.

Paul Lamar
 
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