<VV> custom fans

[Ron]

Haven't you noticed that those least technically educated in blower design 
are the ones complaining the loudest?  It's the old empty wagon rule again. 
They want a thousand dollar blower for ten dollars and complain bitterly 
because no one is giving them one.
RonH

----- Original Message ----- 
From: "Mark Durham" <62vair at gmail.com>
To: <jvhroberts at aol.com>; <corvairgrymm at gmail.com>; 
<virtualvairs at corvair.org>
Sent: Wednesday, May 23, 2012 7:19 AM
Subject: Re: <VV> custom fans


> 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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