This is from SAE paper 92059 Showa Aluminum and Honda.
Everything is based on the Honda rad used in 1990 or so.
One might be able to relate this data to one of those
rads as everything here is relative. No real numbers.
This just indicates designs trends.

Paul Lamar

Paul,

Interesting that you would find this info.  I have slightly damaged
89 Honda radiator.  I discovered that the optimized fins (the rad is
a work of heat exchanger art!) are VERY thin copper and if some
lunkhead (me) tries to clean it by reverse flushing the fins with a

pressure

spray at a $1 car wash, you can fold over the fins.   Since the fins
are 0.07 mm (about 0.003") they are very easy to damage.  Also
the fins are sliced and tweaked to make turbulent flow between adjacent
fins.  Each line on the drawing of the fin is a sheared slit with the edges
twisted out of alignment. This means that the mechanical support of the
outermost piece is a tiny bit of solder on each side.  Easier to bend over.
Neat radiator, but a bit fragile.

Bill Freeman
Long EZ builder & pilot
BSME, MSME
EAA Technical Counselor

I think most newer oil coolers and radiators are somewhat like this now.
The Mazda FD type radiators I have  (Paul, they are about 1" thick) and the
smallish FD oil coolers are built that way. Very delicate and most are
damaged by road debris and need lots of straightening and tweaking. (why or
why in such a low car they didn't put some kind of screen in front of them
I'll never understand-cause racers do) Spray only water from the hose thru
them, not a pressure washer.

Marc Wiese

 
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