Radiator Cap--flow rate through radiator

Michael Skolones michaels at telerobot.com
Tue Oct 14 15:54:45 GMT 1997


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______________________________ Reply Separator _________________________________
Subject: Re: Radiator Cap
Author:  diy_efi at coulomb.eng.ohio-state.edu at Internet
Date:    10/13/97 8:24 PM


There's a problem with the argument below.  If the water is in contact with the 
block long enough to pick up some thermal energy (and no matter how small the 
time of contact is, there _will_ be a thermal transfer if there is a difference 
in temperature), then it will be in contact with the radiator fins long enough 
to get rid of the same amount of thermal energy, provided the radiator is 
properly designed.  Obviously if the radiator is too small, or clogged, or 
bypassed, or what-have-you, then the temperature of the water will continue to 
rise as time goes by.  





Not only does it not absorb enough heat from the engine, it goes through 
the rad so fast it doesn't release the heat either. Getting the coolant 
up to a high enough temp  gets the temp difference at the rad higher, 
allowing the rad to shed more calories or BTUs. This effectively removes 
more heat, even if the operating temp is a bit higher. I know it does 
not make a lot of sense, but without a restrictor in an engine running 
without a stat, overheating of the valve area, for instance, with 
resulting head cracks and/or detonation can be a real problem.
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