[TR] Interesting cooling system web page

[Nolan]

That's a long standing wives tale.

Yes, it's true a teaspoon of slower moving water will absorb more heat in an 
engine than a teaspoon of faster moving water.  But that loses track of the 
fact that faster moving water brings more teaspoons into the engine. 
Thermodynamically, you do better with the faster moving water in the cooling 
system.  In fact, you can make the cooling system smaller with the faster 
moving water.

People do understand this, without realizing it often times.  They grasp it 
on the air side.  They understand that faster moving air through the 
radiator takes more heat than slow moving air.  They understand that's 
primarily why cars overheat in stopped traffic.  They correctly don't worry 
about driving too fast to allow cooling air to stay in the radiator long 
enough.  But, those same people can get all confused when you replace the 
word "air" with "water".

Now cavitation in the head or waterjacket for coolant moving too fast, that 
can be a real problem.  It's certainly not common.  In fact in many cases 
it's not possible with standard waterpumps because they can't move the 
coolant fast enough to create cavitation in the head.   But, it can happen 
in certain cases.


----- Original Message ----- 
From: "tom white" <tswhitez123 at hotmail.com>
To: "Randall" <tr3driver at ca.rr.com>
Cc: <triumphs at autox.team.net>
Sent: Friday, September 28, 2007 5:47 AM
Subject: Re: [TR] Interesting cooling system web page


> Slower flowing water is better according to Mr. Mole, my auto tech 
> teacher.
> The water must stay in the radiator long enough to cool.  If it moves too 
> fast
> it will return to the engine too hot to help.  This is one of the 
> arguments
> against removing the thermostat.
>
> Best regards,
> Tom
>
>
>
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