Re: IML: thermostats

[PAUL WENTINK <randalpark@xxxxxxx>]

The fan should be blowing air into the radiator, not onto the engine.

Paul W.


-----Original Message-----
From: mrs954@xxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Thu, 25 Oct 2007 3:06 am
Subject: Re: IML: thermostats



That's a very good understandable explanation.  I just wonder whose 
idea it was to put the radiator in front of the engine so that the fan 
blows all that heat back onto the engine, where it came from??? :-)

 

Mark

 




-----Original Message-----
From: Frederick Joslin <fljoslin@xxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Wed, 24 Oct 2007 10:39 pm
Subject: IML: thermostats





I have to put my 2.5 cents (with inflation) about thermostats.

A thermostat is designed to get an engine above the thermostat setting 
quickly and to keep it there. The radiator keeps the engine cool. This 
is not a function of the thermostat. If you have excess cooling 
capacity in the radiator, the engine should run close to the thermostat 
temperature. The thermostat keeps the temp above its set point and the 
radiator has the capacity to drop the temp below that point so it 
should cycle around the thermostat temp. 

However, if the engine puts out more heat than the radiator 
can transfer to the environment then the temperature will increase 
until the heat produced is balanced by the heat shed.

Note that as the radiator gets hotter relative to the environment (air 
temp) the heat transfer becomes more effective since the rate of heat 
transfer is proportional to the temperature difference. Conversely as 
the air temp gets hotter (Arizona in the Summer) the effectiveness of 
the radiator decreases because the temperature difference is less.

Heat is generated in the engine and is transferred to the coolant which 
is shed through the radiator. It is the temp in the engine that we care 
about and there are two transfer locations; the heads/block and the 
radiator. Really three locations since in the radiator the heat is 
transferred to the radiator metal which is then transferred to the air. 
All of the transfer locations need to work effectively for a good 
cooling system. If you have poor heat transfer in the heads/block to 
the coolant you risk pre-detonation and potentially other issues 
regardless of how well the other parts work.  

 .       



Fred Joslin




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