<VV> custom fans

[Mark Durham]

Boys, boys, you cannot overturn the laws of physics. You just do not
seem to get that increased pressure will not substantially increase
cooling. Only so much air can move through the fins at the right speed
and pressure to cool.
I used to work for a aircraft research and development firm where we
designed inlets for engine cowls, intercoolers, oil coolers, etc., and
a comparison can be had where a large inlet would be the same as a more
efficient fan in a Corvair. We actually had to decrease the size of the
opening at the inlet and slow down the air (reduce the pressure in the
air box over the engine, to get efficient cooling thru the fins. More
pressure brought on turbulent flow which caused hot spots. The Corvair
stock fan is a mass production design and does the job for production
engines. A fancier design may save some hp for drivers, but adding more
pressure might have the opposite of the intended effect.
If you really want more cooling then install a intercooler, move the
oil cooler and put a fan on it or redirect the outlet air away from the
lower shroud area, and then realize that the turbo'd engines run hotter
( but at equivalent temps turbo'd aircraft engines run, I say this
because I consider the temps to be normal) (and if yours is
consistently overheating, there is something wrong somewhere) and will
last a shorter life span. Also use the best synthetic oil. Mark Durham

Sent from my Windows Phone
From: jvhroberts at aol.com
Sent: 5/23/2012 2:44
To: corvairgrymm at gmail.com; virtualvairs at corvair.org
Subject: Re: <VV> custom fans

 Except the stock fan is often inadequate. An improved design can be
driven more slowly, if that's a concern.

However, given how insanely inefficient the stocker is, any improved
design should both generate more pressure AND consume less HP.



John Roberts




-----Original Message-----
From: Ramon Rodriguez III <corvairgrymm at gmail.com>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Wed, May 23, 2012 2:36 am
Subject: <VV> custom fans


Hey guys, I'm 394 emails behind currently so I probably didn't read all the
posts involving the possibility of increasing cooling capacity via custom
fans, but I do have something to say (I apologize if it was already
covered).

Those "in the know" seem to agree that the stock fan is a "horrible"
design, so how about going the other direction.  Give us a new fan that
will provide the same cooling capacity as the OEM fan, but cost less
horsepower.  Now *that* I would buy!  Yes I know about the mods to
under-drive the cooling fan, but if we have a much more efficient fan
design it should be able to do the job with even less power than is used
turning the "terrible" stock fan at the slower speed.

-- 
Ray "Grymm" Rodriguez III
Lake Ariel, PA
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