[Land-speed] Electric water pumps

[Tom Bryant]

Well stated Neil. ......I told you I was not the brightest!

Tom, Redding CA - #216 D/FCC

-------Original Message-------

From: neil at dbelltech.com
Date: 2/14/2008 4:29:30 PM
To: 'Tom Bryant';  'LAND SPEED LIST';  'Adin David'
Subject: RE: [Land-speed] Electric water pumps

Tom;

Water can't move "too fast to pick up the heat" in the block or the
radiator; water picks up heat by increasing its temperature-- if the flow is
low (low volume) the water temperature increase is high. If the flow
(volume) is high, the water temperature increases less but the amount of
heat is the same-- all things being equal otherwise. The total heat absorbed
(in a given time)is the water volume times the temperature increase going
through the block.

One important factor is the pressure in the cooling jacket caused by the
water pump flow and the restriction of the thermostat. Electric pumps
typically don't develop the pressure in the block that a good mechanical
Pump can. Low pressure means local hot spots in the block due to lower
boiling temperature caused by low coolant pressure. Water pump flow through
the block & heads add to the radiator pressure cap value.

Regards, Neil   Tucson, AZ

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