[DeTomaso] Meziere water pumps
MikeLDrew at aol.com
MikeLDrew at aol.com
Mon Jan 16 19:48:54 EST 2012
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
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