<VV> Electric cooling fan results

[JVHRoberts at aol.com]

I've seen the blower curves for a 911 blower. that 9 HP is at full  throttle, 
pushing nearly 3600 CFM, at 20" H2O. That's one hell of a lot better  than 
what the Corvair blower does!
 
Porsches do have more open fin area, but to cool effectively, it simply  
takes AIR FLOW! And they also push a LOT more air through their fins than Chevy  
did. 
 
And that's a ray of hope...
 
In a message dated 7/29/2007 11:59:25 P.M. Eastern Daylight Time,  
r.gault at sbcglobal.net writes:

The only  number I've been able to find is, "The 911 fan takes 9 hp".  If
this  is correct, that's not much help in getting to the electric  motor
range.  I've seen pressure blowers that give around 1700 CFM at  11" in of
water - they run about 5-6 hp.  Still no electric joy.   There is no general
purpose solution down this path, we just don't have  enough wattage.

I'm amused by the continual assertion that the 911 fan  is "more efficient".
Where's the evidence?  Just because it has a big  "P" stamped on it?  Where
are the pressure vs flow vs hp curves?   How does it match up to our pressure
vs flow curve needs?  Does the  911 fan even put out enough pressure to cool
the Corvair?

If you  look through a 140 head, it's a miracle the poor fan can push any
useful  amount of air through.  I say the reason the 911 fan cools  more
horsepower than the Corvair fan is because the Porsche valves are  stacked
vertically allowing WAY more open area in the heads for  airflow.  Prove me
wrong.

Roger







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