[DeTomaso] Edelbrock Weiand and FlowKooler Water Pumps
MikeLDrew at aol.com
MikeLDrew at aol.com
Thu Nov 14 23:42:33 EST 2013
In a message dated 11/14/13 18 58 15, SOBill at aol.com writes:
> If you use a non-hat thermostat with a non-bypass pump (Wieand), water
> will not recirculate thru the block and the engine will warm up somewhat
> slower.
>
More to the point, initially water will stagnate and cavitate as the water
pump churns away with no possibility of water flow. You will also get hot
spots in the engine as it heats up unevenly, with steam pockets potentially
forming. One of the coldest points in the system will be right where the
thermostat is, so heat will have to radiate through the water in order for
the thermostat to open (rather than hot water flowing to reach it).
Then, when the thermostat finally opens up, scalding hot water flows
forward, and ice-cold water is sucked into the engine. WHAM! Thermal shock,
big-time! That cold water will reach the thermostat, and will only be
partially warmed, so the thermostat will close again, and the cycle will repeat
several times. This is very hard on the block, apparently.
In short, it's a very stupid thing to do. Now, if the bypass orifice is
blocked off only partially, and a bypass pump is used, the probably won't be
nearly as bad. The engine should heat up evenly, as it would with a normal
cooling system setup. When the thermostat opens, though, a certain
percentage of the water will continue to circulate through the block instead of
going to the radiator.
This isn't a terrible thing. For if you look closely at the 351C
thermostat 'hat' you'll see it is a fair bit smaller than the orifice that it is
designed to block. It never closes it off completely, and instead allows some
water to circulate through the engine, following the same model (in a
different way) as the other Ford families of V-8s (which use a small external
rubber hose to accomplish with the 351C does with an internal passageway).
Mike
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