Notice that there is very little pressure drop across the pump
at the higher flow rates. The stock pump has about a 1/8th or 3/16th bleed
hole between input and output accounting for the slight pressure

difference

over the new casting. also I suspect it has a bit more clearance. Will

check

that using the clay test later in the week.

Vance W Jaqua wrote:

"Very little pressure drop across the pump"!!!????  it always seemed to m
that a pump was supposed to make pressure rise - that is where the HP is
supposed to go - I still think you have a problem -  and as soon as
I can get the time I will build up a system  - Vance

Depends on which direction you are going. Does current flow from positive to
negative or negative to positive? :)

Good for you. Do you want to borrow my flow meter, optical tach and gages?
Use that big hairy motor you have and add a torque arm for HP.
I will also loan you a couple of pumps to test.
You can use the two sets of V belts I have as well but you
will need a pulley for the motor so the pump runs at 6000 to 7000 RPM max.

BTW I had a talk with Jim Mederer on the subject of water pumps and he agrees
with me. A restrictor is not a good idea and you want as much water flow through
the block as you can get.

Paul Lamar
 
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