I have made my own water pump, planning on using a direct drive off the end
of the E shaft on a 20B.  It is made from the innards of a Stewart pump for a
Chrysler.

The first test gave a free flow of 50 gpm at 2600 RPM.  Throttled down to 10
psi, it gave 20 gpm.  Max pressure was about 16 psi with full shutoff
resulting in about 12 psi.

I am working on a way to get other RPM for testing.

Does anyone know what numbers are desirable for a pump for this engine?

I sure have no idea.

Bob Darrah

Good work Bob. I would love to see a chart on it with flow verses 
pressure and RPM. What is the impeller diameter? ID of input and output
pipes? Got any pictures?

Paul Lamar
 
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