Military-Vehicles: Re: [MV] M37 Running Hot

Re: [MV] M37 Running Hot

Richard Evans (richard.evans@rd.bbc.co.uk)
Wed, 06 Aug 1997 17:08:05 +0100

Rod wrote some good stuff about why thermostats do a good job,
then wrote:

>removal of the thermostat can make some
>engines overheat. The thermostat forms a big restriction in the flow path
>of the coolant through your engine. It's removal means that the coolant
>travels much faster thought the engine and radiator.

Agreed

>Faster means less time
>for the heat to transfer to the coolant in the engine and less time for it
>to transfer to the radiator and hence the air.

But if the coolant is circulating quickly, then the although the heat transfer
per unit of coolant is less, there is a greater volume of coolant flowing per
second.

Or put another way, each cubic inch of coolant won't absorb so much heat inside
the block, but then again it won't have so much heat to dissipate in the rad.
So the overall effect is that as long as you have a good flow, it will work OK.
It can't flow too quickly in this respect.

But, unless your thermostat is jammed shut, then removing it is not solving the
problem. The real problem is somewhere else.

richard evans

England


==========================================================================
Richard H. Evans R&D Engineer

Mail: BBC R&D Department, Kingswood Warren, Tadworth, Surrey, KT20 6NP
Tel: +44 1737 836678
Fax: +44 1737 836667
e-mail: richard.evans@rd.bbc.co.uk

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