Bob,
Just curious, but where does the 9 times flow resistance come from?
Friction loss in pipe is directly proportional to the length of pipe (the
additional bends would accounted for by adding equivalent lengths for them)
and is inversly proportional to the 4.87 power of the diameter.
Joe
-----Original Message-----
From: Bob Palmer <rpalmer@ames.ucsd.edu>
To: Armand & Lorie Ritchie <ritchie@mcn.org>; tigers@autox.team.net
<tigers@autox.team.net>
Date: Sunday, August 30, 1998 2:57 PM
Subject: Re: u s radiators
>Armand, Lorie, et Listers,
>
>I couldn't access this site, but with regard to a triple-pass radiator,
>this is certainly not a new concept. I first saw this type of radiator in
>the mid '70s, and they probably weren't new even then. I have never heard
>an explanation I believed about why double or triple pass would be better.
>I had a long conversation with Ron Davis (aluminum racing radiator builder)
>about the multiple pass concept and he believes that two is better than
>one, but three is too much. This I am sure of, a three pass radiator has
>NINE TIMES ( that's 9X) the flow resistance of a single pass radiator. If
>you try using a garden hose to run water through a three-pass, you'll
>quickly see what I mean. I ended up getting a three-pass from Ron, but am
>not convinced I did the right thing; would have preferred a two-pass, but
>that leaves the outlet and inlet on the same side so it requires some
>modifications to the hoses and water pump. At the very least, a three-pass
>needs a good water pump that will provide enough pressure to ensure good
>flow, especially at low rpms. I got my water pump from Sunbeam Specialties
>and it seems to do a good job. In fact, I drilled a 1/8" hole in the
>thermostat and even this small hole allows enough flow to keep it running
>well below the thermostat regulation temp (195 F) most of the time.
>
>Bob
>
>At 10:35 AM 8/30/98 +0100, Armand & Lorie Ritchie wrote:
>>Hi all I just checked out a neat web site (www.usradiators.com) they have
a
>>novel concept of radiator design. Triple flow which they claim is the
most
>>efficient. the radiator is made with three separate chambers that the
>>coolant must travel through. They do customs and hotrods also sports
cars.
>>You can submit a drawing and they will give you a quote on price.
>>Interesting site.
>>regards Armand Ritchie
>>
>>ritchie@mcn.org
>>Armand & Lorie Ritchie
>>
>Robert L. Palmer
>Dept. of AMES, Univ. of Calif., San Diego
>rpalmer@ames.ucsd.edu
>rpalmer@cts.com
>
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