Didn't we have this discussion a while back? Some ideas die hard.
When I took physics, I learned that the bigger the difference in
temperature, the faster the heat transfer. End of story. Yes, there is less
time for the heat transfer to take place from a given gram of water, but it
will immediately be replaced by another, warmer gram of water. The net
effect of faster water travel is warmer water in the radiator, and that is
what we want, isn't it?
No matter how I look at this, I see slower water flow as a means to increase
engine temperature. The longer the water is in the radiator, the cooler it
becomes, resulting in less efficient heat transfer to the radiator core.
Let me phrase this differently. In a given time interval, how do you get a
better heat transfer from 10 gallons of water than you would get from 20
gallons of warmer water?
Tom Zuchowski
Clemmons, NC
'71 Fiat 850 Spyder
'61 Austin-Healey Sprite
> -----Original Message-----
> From: owner-spridgets@autox.team.net
> [mailto:owner-spridgets@autox.team.net]On Behalf Of Paul A. Asgeirsson
> Sent: Sunday, September 30, 2001 2:21 PM
> To: DLancer7676@cs.com
> Cc: macy@bbl.med.upenn.edu; mikeg@vicnet.net.au;
> spridgets@autox.team.net
> Subject: Re: cooling & radiators
>
>
> DLancer7676@cs.com wrote:
>
> > In a message dated 9/30/2001 8:12:06 AM Eastern Daylight Time,
> > macy@bbl.med.upenn.edu writes:
> >
> > > So if you increase the diameter of the water pump pulley won't it turn
> > > slower than stock??
> >
> > I think that is what they were wanting to do, Larry, under the
> theory that
> > the coolant would pick up more heat in the engine, then,
> traveling slower
> > through the radiator, give up more heat.
> >
> > --David C.
>
> With the very short travel through the radiators these cars have,
> I suspect that
> it was a reasonably effective way to enhance heat exchange. If
> these cars had
> radiators that were 4 to 6 inches longer in hot water travel, I
> doubt that there
> would be a lot of problems with the so called high temp running.
> Short travel
> equals less heat drop in degrees of cooling. Slowing the coolant
> travel down
> allows it to be in this short run a tad longer with a resultant
> higher drop in
> temperature.
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