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Re: Hot MGs and thermostats

To: british-cars@autox.team.net, wzehring@cmb.biosci.wayne.edu
Subject: Re: Hot MGs and thermostats
From: sfisher@megatest.com (Scott Fisher)
Date: Thu, 9 Jun 1994 11:09:54 +0800
~ Fellow fiends:
~ 
~ Correct me if I'm wrong (sic), but doesn't the thermostat also help by 
~ *restricting* the flow of coolant, when the engine is hot?  That is, 
~ increasing the 'transit time' in the radiator so as to provide more time for 
~ heat exchange per volume of coolant flowing through?  

RUN AWAY! RUN AWAY!  IT'S THE WAR OF THE THERMODYNAMICISTS!!

There was a voluble, heated, and interminable round of discussion on
precisely this topic last summer (gee, about the time we get our
LBCs tuned up for hot weather).  This is precisely why I limited my
comments to the observation -- empirically provable in five minutes
with a half-inch wrench -- that the thermostat is meant to redirect
some of the coolant through an itty-bitty hole that recirculates
it through the head.

As for whether faster or slower flow results in increased hot-soak
versus improved thermal transfer, I refuse to venture an opinion as 
there were a number of highly qualified, well-educated people at one 
another's throats on exactly this issue.  Better to go into a group of 
palaeontologists and say "Brontosaurus" than to bring up this
discussion again...

~ I still vote for louvers in the hood.  Even if it doesn't work, I think it 
~ would *look* cool! (hahahahahahahahaha)

Exactly so.  Then you need the leather strap across the bonnet to
complete the Healey 100M look.  Besides, it gives the crumpets
something to hold on to... (whoops! :-)

~ Will "I have a Ph.D., but it ain't in thermostats (or comedy)" Zehring

As Dan Coffey would say, "*I* have a MASTER'S DEGREE... in SCIENCE."

--Scott "Not really, but I have an Ask Doctor Science coffee mug" Fisher


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