Ken Gillanders wrote:

Could you mention the location of the wiggin's. You mentioned before that
for a single large rad under the cowl, 4 would be required. I signed up for
4 and want to make sure that I have enough.

Ken Gillanders
BD4 rotary powered

I would say four is a minimum one each on input and output of the rad and 
one each on input and output of the water pump. That is assuming you are using
one rad... probably under the engine.

Speaking of rads I just got off the phone with Fluidyne and the sales manager
claimed they can make a cross counter flow rad. They call it "circular" for some
strange reason but you need to explain the hot water goes in the back row of
tubes first and then through the front row. Don't mention me or airplanes.
I told them I was doing race car consulting. Don't blow my cover :-)

They seem to be gathering pressure drop info for me on both coolant
and air pressure drops. I requested info at 30 to 40 GPM on the coolant side
and 80 to 100 MPH on the air side. If anybody is interested in other data
points let me know. I forgot to ask for temp drops at typical flow rates. 
It would be too much to expect for them to have data over a much wider
range.  I have yet to find a lab that is doing applied research on
automotive rads.

BTW a couple of facts about rads. If you have a two pass rad it has roughly
twice the restriction of single pass rad. If the rad is a two row rather than
a one row it has half the restriction. The bottom line is if you want to go
to a two inch thick two row rad from a one inch thick one row rad and keep
all other things constant you then need to specify a two pass rad. 
It is kind of confusing scientifically and R&D speaking if you change
two things at once. The Mazda cooling system is designed for a single pass
single row rad. 
 
Paul Lamar
 
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