[DeTomaso] Bypass (Re: thermostats)

Garth Rodericks garth_rodericks at yahoo.com
Wed Jun 24 14:20:25 EDT 2009


FWIW, the Weiand #8209 aluminum water pump for a 351C does not have the bypass, 
so no need to block anything:
http://www.banzairunnerpantera.com/updates_thermostat.htm

Cheers!
Garth

--- Original Message ---
It doesn't matter which location you block. I put an expansion plug in the
center of the copper disc in the engine outlet. Others use a thin sheet to
block the bypass at the pump joint gasket. Either way, you are eliminating
the leakage of hot coolant back into the engine without going  to the rad.
Some aftermarket pumps don't even have a bypass passage. My flowkooler has
the bypass, so I had to block it.

When the Cleveland style stat is fully open (hot) the foot on it still
allows some coolant to flow back to the engine, bypassing the rad. In theory
this should be an insignificant amount, but in a marginal system with long
pipes, I wonder how much it contributes to the issue? I looket at the gap
and it seemed like it would be a loss. I'm using NPGR coolant, so I want the
absolute maximum flow I can get. If I have to convert back to ehylene
glycol, my cooling system will be optimised already.

Barry

----------------------------------------------------------------------------
----

Okay, so if a person uses a remote bypass thermostat, what do you do
with the thermostat area in the block?  There is a bypass passage
where the thermostat goes which the -special- 351C thermostat closes
when the stat is fully open.  So do we block that?  Or must you make
the water pump mod instead, which installs a small shim of steel to
block the recirculation path?

Pardon me for my confusion, I'm not studying this very hard.  (trying
to get some real work done in between emails)

Asa Jay

Quoting Barry Seib <oldwheel at mts.net>:

> Jack
>
> I bought a very good remote bypass thermostat from Evans Coolant(E3005
> Remote by-pass thermostat 195°)
> http://www.evanscooling.com/main1.htm - go to catalog then Thermostats and
> caps. $99.95  I'm quite happy with it.
>  It is made by Behr in Germany and has the least restriction I could find
in
> a remote bypass stat. Evans said it was about the same restriction as the
> high flow Robert Shaw type in the engine. I previously special-ordered the
> Stant model 135478 that was recommended in John's article, but found it
> lacking in flow capacity. I still have it new in the box if anyone wants
to
> use it.
>
> Barry
>




      


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