[Land-speed] Electric water pumps

[neil at dbelltech.com]

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


-----Original Message-----
From: land-speed-bounces+neil=dbelltech.com at autox.team.net
[mailto:land-speed-bounces+neil=dbelltech.com at autox.team.net] On Behalf Of
Tom Bryant
Sent: Thursday, February 14, 2008 11:19 AM
To: LAND SPEED LIST; Adin David
Subject: Re: [Land-speed] Electric water pumps

Always run a thermostat or restriction. Water that moves too fast will not
pick up the heat. I prefer a 190 degree F. thermostat.

Tom, Redding CA - #216 D/FCC

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

From: Adin, David
Date: 2/14/2008 8:37:29 AM
To: LAND SPEED LIST
Subject: Re: [Land-speed] Electric water pumps

How does a person determine the proper "gpm" for a given application?
How much is too much?  Or is there such a thing as too much?

Thanks,

David in Durango

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