mgb-v8
[Top] [All Lists]

Cooling in relation to water speed

To: mgb-v8@autox.team.net, mgs@autox.team.net
Subject: Cooling in relation to water speed
From: Barrie Robinson <barrie@look.ca>
Date: Wed, 07 Dec 2005 16:32:30 -0800
Reply-to: Barrie Robinson <barrie@look.ca>
Sender: owner-mgb-v8@autox.team.net
Well, my email about cooling in relation to water flow seems to have 
stirred up a hornet's nest.  I have tons of information for which I 
thank one and all.   There was a definite chasm between the 
experienced 'racer' types and the engineering types. One thing is 
positive - there are many factors to consider but the fundamental 
question is still paramount in my search.  That is, does flow rate 
effect the rate of heat dissipation from the radiator?

Having considered all the replies it would seem that fast flow of 
coolant is better than slow.  The problems found by removing 
thermostats and causing cooling problems is probably not because of 
increased water flow - but due to other effects.  My main reason for 
coming down to this side is a basic premise that if it is better to 
have air belting over radiators (powerful electric fans) then the 
same must apply to water screaming down the radiator tubes.  The 
other is a simple premise, slower water will take up more heat and 
thus the temperature difference between it and the tubes cooled by 
air flow is made smaller.  I believe this difference squared is 
proportional to the heat transfer - (help me here folks as it is over 
40 years since I read thermodynamics) the bigger the delta the higher 
rate of transfer.  So we get less heat transfer the slower the water 
goes through the radiator.

One point that was made was that the removal of a thermostat resulted 
in a lowering of the pressure to the block (water pump hump!), which 
dropped the boiling point, which effected cooling.

But most compelling was a web page from Stewart Components 
www.stewartcomponents.com  (Tech Tip 3) sent to me by Jim Stuart.  It 
laid it all out and said slow speed water is a myth -

However after the Christmas holidays I shall set up a test rig just 
to test flow against heat dissipation. .....and maybe the use of 
Water Wetter about which I have doubts.. And before I get emails 
saying all the NASCAR people use it - they also use STP, Coca Cola, 
Febreeze, and used to promote cigarettes.


Regards
Barrie

Barrie Robinson
(705) 721-9060 

///
///  mgb-v8@autox.team.net mailing list
///  Send admin requests to majordomo@autox.team.net
///  Send list postings to mgb-v8@autox.team.net
///  Edit your replies!  If they include this trailer, they will NOT be sent.
///


<Prev in Thread] Current Thread [Next in Thread>