I was reading the response from Powersport and noticed a comment about
future plans to encorporate a single adjustable flap at the back of the
cowl exit plenum. I have pondered this for my setup as it seems quicker
to build and cleaner and less complex than the multiple cowl flap and
associated linkage . I had previously decided to stick with the multiple
adjustable cowl flaps based on some discovery from your dodge caravan
mounted rad/ plenum/manomometer testing that stated any obstructions
within 10" of exit area would reduce cooling efficiency.

I would rather use the cowl as the exit plenum but not sure of a size
and shape that might work with reasonable results if  at all.

My current rad/oil cooler is aprox. 18 by 18 by 2 with a 30 % inlet
based on my 130 mph cruise

I was  also thinking of putting a small adjustable butterfly valve in
the inlet wedge at the beginning of the oil cooler to divert some air to
oil cooler as I suspect most airflow may bypass . Any comments welcome.

Geir             Murphy Elite

Two things. Not useing the cowl as an exit plenum means
not subjecting the whole rad to under cowl heat which
can be much higher than out side air. One degree increase
in the temp of the air around the rad will reduce the cooling
eff. by 1%. Also if the rad "sees" the exhaust pipes it will
gain heat by radiation.

Keep the air going into the rad and the rad itself as
cool as possible.

Also something like the bottom of the oil pan being too
close to the rad will reduce the air flow.

If you turn your rad 90 degrees it will be easier
to plumb.

Paul Lamar ...No rotor no motor.

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