Whew!  I just ordered a custom rad from CRRacing.  They
make a small 17.5 x 2 x 13 inch radiator that I'm having them
customize by removing the filler neck, and putting 1" NPT ports
in.  That is about the same volume of radiator I have now, and
fits very well under the engine in a LongEZ.
--

Bill Freeman wrote:

Perry,

Aren't 1"NPT ports a bit small?   What size rad hose
are you using?

"Perry J. Mick" wrote:

I'm currently using two 14x18x1 condenser cores from '83 rx-7s.
These have metric fittings on them that I cut off and tapped 1" NPT.
But, these "rads" have four small, 1/4 inch diameter tubes that
serpentine back and forth across the rad.  So the 3/4" id mil tubing
I have going to the rad is more cross-sectional area than those four
little tubes.  So I have two 3/4" id mil tubing feeding the two rads
and two 3/4" tubes for the return.  I'm using about the biggest
AN fitting you can get, -12D I think, that has the 1" NPT and goes
to a 3/4" id hose barb.

The new rad is 17.3x13x2 so about the same volume, but it will
have end tanks and will probably flow better.  I'm planning to use
the -12D fittings again, but this time will use braided hoses with
the aeroquip fittings on the ends.  But I think 3/4" id tubing will
still be ok even though I now will only have one instead of two.

It will be an experiment, to see if this setup will work better,
worse, or the same as what  I have now, which works great BTW.
I never have water cooling problems, almost too cool sometimes.

Tracy is running small radiator hoses I believe.  The big 1.5 inch
stuff they use in the car is not necessary, I think most people are
using smaller hose diameters than that.  May be necessary in some
higher powered apps.
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org