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Ray wrote:
WRG>70319133825.23090G-100000@northpole.med.uvm.
WRG>On Wed, 19 Mar 1997 GOFASTMG@aol.com wrote:
WRG>>
WRG>> Actually, the answer to your question is Yes and No. The thermostat doe
WRG>> help to maintain cooling , not by closing when it gets too hot, but by a
WRG>> restriction to the water flow through the engine, thus allowing the trans
WRG>> of heat by the radiator.
WRG>> If the water passes through the radiator too quickly, it retains too muc
WRG>> heat and consequently the return coolant is at an elevated temp. entering
WRG>the
WRG>> block, where it picks up more heat, etc, etc.
WRG>> If you absolutely, positively have to run without a thermostat, (for
WRG>> competition etc), replace the thermostat with a blanking sleeve or a gutt
WRG>> thermostat to retain the restriction in the flow path, to allow the radia
WRG>> a chance to do it's job
WRG>>
WRG>> Rick
WRG>>
WRG>I am convinced this is not correct.
WRG> Ray Gibbons Dept. of Molecular Physiology & Biophysics
WRG> Univ. of Vermont College of Medicine, Burlington, VT
WRG> gibbons@northpole.med.uvm.edu (802) 656-8910
I know you're right, I work on and operate aluminum diecast furnaces
for a living, and I do under stand heat flow. I'm only a wage slave so
this might not be real technical sounding, but here goes..
Your engine produces varying amounts of BTU's, depending on rpm's
and load, your radiator also has a BTU rating ( like an air
conditioner) that changes with Gallons per hour, and ambient temp.
At an idle, your engines BTU's excede the radiators BTU's ( due to
low water flow, and high ambient temp.). Your options are to, increase
the water flow, decrease the ambient temp. ( easier said than done),
Change the size of the heat exchanger (radiator), or move more air
through the heat exchanger( add on fan, better fan ).
Reducing the water flow to the radiator will not help much, except
to increase the pressure some what. If reduceing the flow does not
increase the pressure, it does not help at all, it hurts the
effectiveness of the radiator.
I think when they made these cars, they didn't put any more radiator
in than they absolutely had to. ( that costs money !) So we're stuck
with cars that get hot at an idle.
I added a fan and houseing out of an 86 Nissan to the front of my
radiator, and now, with the flip of a switch, no more problem.
John
65 midget ( for sale)
71 midget
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þ SLMR 2.1a þ john.kahoon@pcohio.com
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