Actually, the last thing you'd want is an efficient pump. It would use up
lots of horsepower at higher RPM. It's extremely rare for cooling flow
rate to be the problem with overheating in engines--in fact the flow
usually has to be reduced. Usually the biggest problems are radiator size
and efficiency, fouling of the surfaces to be cooled, and flow design
inside the engine. Pumping more water can easily do more harm than good.
If you're having overheating problems the three best things you can do is
flush the heck out of your cooling system (use a flushing compound with
some detergent--your sleeves are likely to be fouled with oil (it's
British!!), make sure your shrouds are directing all the airflow through
your rad, and replace your radiator with something more modern. You can
get a custom-made radiator that looks like your old one for not much money
at any really good radiator shop. Better yet, have them make you one
that's big enough to really fill the intake hole.
-----Original Message-----
From: Gt6steve@aol.com [mailto:Gt6steve@aol.com]
Sent: Monday, July 22, 2002 9:45 AM
To: Bill Babcock
Cc: FOT@autox.team.net
Subject: Re: Triumph water pumps
Thanx Bill, I was stewing on the DP and thinking that the restrictor at
the
thermostat housing was essentially an orifice. It may be too large but I
should tap in some gauges and see if there's a Delta. I keep looking at
modern centrifugal pumps hoping to find a nice impeller we can use but
nothing yet.
Thanks, Steve
<<
If you really want to measure what the pump is doing you need a
differential pressure across it--from suction to discharge. Then it won't
matter much that the temperature is varying the pressure in the system.
These are pretty simple centrifugal pumps with a huge amount of gap
between the housing and impeller. I'm not surprised that they don't do
much at idle. They have to be designed to work in a range from 750 RPM to
over 5000 without eating up all the horsepower.
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