[DeTomaso] Meziere water pumps

[Ken Green]

All of the performance pump and radiator folks I have talked to disagree.  They all want a high coolant flow rate when the engine is at high RPM and creating lots of heat.  From Stewart components:
 
"In order to increase your cooling system's performance you must maximize both the WATER flow and AIR flow."
 
Who is your source?
 
Ken

From: "MikeLDrew at aol.com" <MikeLDrew at aol.com>
To: kenn_green at yahoo.com; Bill at incendium.com; michael at michaelshortt.com 
Cc: asajay at asajay.com; detomaso at realbig.com 
Sent: Monday, January 16, 2012 4:48 PM
Subject: Re: [DeTomaso] Meziere water pumps



In a message dated 1/15/12 21 42 34, kenn_green at yahoo.com writes:


The advantages are probably more coolant flow at low RPM and less parasitic drag at high RPM.  The disadvantage is less flow at high RPM if you need the increased flow.


You never need increased flow at higher rpm--in fact it's probably a disadvanage.  NASCAR-type engines that rely on mechanical water pumps often use underdrive pulleys to slow the water pump down so that the water doesn't cavitate at high rpm.

There is an optimum flow rate.  A mechanical pump will deliver less, or more than that rate, most of the time, depending on engine rpm.  A great advantage of an electrical pump is that no matter how fast the engine is spinning, the coolant is flowing at a fixed rate (which is hopefully somewhere near the optimum rate).

Mike