<VV> A Tale of Two Fans

[Ron]

And the results you noted below agree reasonably well with the GM results on 
mass air flow quoted in your book, The Classic Corvair, so there really 
isn't much to dispute.  There also isn't enough difference between the three 
impellers to get excited about.

RonH

----- Original Message ----- 
From: <BobHelt at aol.com>
To: <lechevrier at earthlink.net>; <virtualvairs at corvair.org>; <jld at wk.net>; 
<tonyu at roava.net>
Sent: Sunday, August 05, 2007 10:20 AM
Subject: Re: <VV> A Tale of Two Fans


>
> 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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