<VV> Electric cooling fan results

[Ron]

#1  More pressure means more power so you can't use the same motor.
#2  More cooling cross section really means a whole different engine.  If 
fins are thinned, fin efficiency goes down.  Sleeved aluminum cylinders 
would be a good start but the head is already aluminum and only a complete 
redesign with much more expensive casting methods would be needed.  Who 
wants to pay for that?

RonH

----- Original Message ----- 
From: "D. Monasterio" <dmonasterio at megared.net.mx>
To: "virtualvairs" <virtualvairs at corvair.org>
Sent: Sunday, July 29, 2007 5:11 PM
Subject: Re:<VV> Electric cooling fan results


>    There is something that got my attention on the electric fan testing: 
> <<The stock fan is rated somewhere around 1400 CFM at an engine speed  of 
> 4000 RPM, while many electric fans are rated at a much higher CFM.  This 
> leads  one into thinking that the electric fan might flow more  air.>>
>    Yes, much higher CFM but, not enough pressure as I suppose, by the 
> results, is needed on a Corvair engine. I deal frequently with water pumps 
> (a fluid like air is) and this lead me to an analogy. We can get a high 
> pressure-low volume pump or a low pressure-high volume pump (with the same 
> HP motor) depending on the needs. By the testings, it seems like the 
> Corvair engine doesn't need more than the stated 1400 CFM but, 
> considerably more pressure to make that air volume passing  thru the rough 
> cooling fins on the engine.
> <<...there was a lot of air reversion  through the electric fan  when it 
> was running statically. In comparison  the stock fan had NO air reversion 
> through the fan.  Even with  the electric fan and the air doors  open, 
> there was still air reversion  back through the fan. Not as much mind you, 
> but there was still air  reversion.>>
>    So, two toughts come to my mind:
> 1.- Changing the fan for a type (I know nothing about fans) that could 
> give more pressure at say the 1400 CFM with the same electric motor.
> 2.- Working on the engine (readed something about this on a previous 
> message) to give more area for the air to pass thru, like thinning and 
> smoothing heads and cylinders fins.
>    Didn't read a word about plenum air pressures. Do they were measured ?
>    Thanks a lot to Bob Helt, Ken Hand and Frank Parker for their money, 
> time and work on making this test that could lead to get more efficiency 
> and performance to our old engines.
>
>    Daniel Monasterio
>
>
>
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