<VV> A Tale of Two Fans

[BobHelt at aol.com]

Hi Bill,
I, too, noticed the differences here and am wondering what is happening. So  
in order to add more confusion, hoping that something significant will become  
apparent, here's another input.
 
Renown Corvair expert and tinkerer Bob Ballew has run some tests and made a  
written report on his findings, dated 14Feb00. In his report, he describes  
testing the airflow of all three versions of Corvair fans on the same 80-hp  
engine, from idle to 3000 rpm. Admittably, there might have been stuff happening  
at higher speeds, but this test does have a certain validity.
OK, in a nutshell, he found that the 16-vane 1962-63 fan moved 7% more air  
than the other two fans. And just as interesting, was the fact that both the  
24-vane and 11-vane fans moved almost IDENTICAL volumes of air over the tested  
speed range. 
 
So that makes the 1962-63 fan best of all from his testing.
 
Regards,
Bob Helt
 
 
In a message dated 8/5/2007 1:17:29 AM US Mountain Standard Time,  
lechevrier at earthlink.net writes:

We have  an interesting situation here with differing reports from 
different  individuals --

Tony says, "Anyway, it's wearing a mag fan now which,  sorry as it is, 
still cools better than that '60 fan did."

Jim  says, "Replaced the 65 fan and top shroud with a 61 radial blade (24  
blade) steel fan and matching shroud - 280-320 F cylinder head temps on  
90 degree day @ 3,600 rpm full throttle for 30 minutes."

Now,  assuming that the 24 blade fan is the same unit that didn't cool 
Tony's  car, and it should be as the 24 blade fan was oem for the 1960 
and some  early 1961's, what gives?  What is different?  Is Jim running  
the thermostatically controlled annular ring of the 1960  design?

Yes, Jim has data, but Tony has empirical results -- Jim is  happy with 
24 blades and Tony is happy with 11 blades, and each removed  the other 
one from their engines seeking better  cooling.

Confused,

Bill Strickland







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