From: Lehanover@aol.com
Message-ID: <4e.26643f51.2d2f93ad@aol.com>
Date: Fri, 9 Jan 2004 00:18:37 EST
Subject: Re: [FlyRotary] Re: Series vs parralel rads
To: flyrotary@lancaironline.net
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In a message dated 1/8/2004 7:29:42 PM Central Standard Time, 
peterz@zutrasoft.com writes:

<< I would think that the relative
 flows could be closely controlled by adjusting the shape & size of each
 of the restrictors.  As long as the Cores were relatively close in
 flow-rates I would imagine that the amount of restriction required at
 the exits would be minimal.
  
 Just a theory (anyone care to give it a spin? - or have they already?),
  
 Cheers,
 Pete
 Europa builder and single rotor dreamer. 
   >>

The cores are by far "the Restriction" in the circuit. A hose with a 3/4 ID 
is adequate for flowing all of the coolant. A parallel installation is just 
like one core that is twice as tall. A series installation is just like a double 
pass radiator, one half the height but twice the length of tube runs. I have 
run both double and triple pass radiators in the race car with good result. All 
of the coolant in my engine passes through a 5/8" hole in a restrictor. Never 
had an overheating problem. I use a 19" by 31" two tube row 
Griffin radiator. It is a double pass. Inlet and outlet on the passenger 
side. 

If there is going to be a difference in effectiveness between the two 
systems, it probably isn't more that one or two percent. So the first thing that 
comes to mind is which one is lighter. Series wins. I would use 3/4" or 1" ID hose 
to hook it up. I would use formed 90 degree silicone hose segments and two 
hose clamps at each junction. So you save time and money on the installation, to 
spend on the ducting to the cores which is more important anyway.

Lynn E. Hanover