<VV> Electric cooling fan results

[Roger Gault]

My point exactly.  There is NO usable information on the 911 fan that I have
been able to find.  Any claims of efficiency are simply rumor and
speculation.

Roger
----- Original Message ----- 
From: "Ron" <ronh at owt.com>
To: "Roger Gault" <r.gault at sbcglobal.net>; "Corvair List"
<virtualvairs at corvair.org>
Sent: Monday, July 30, 2007 12:30 AM
Subject: Re: <VV> Electric cooling fan results


> "The 911 fan takes 9 hp"  At what speed?  there's not enough info to make
> any comparisons.  Also, has anyone priced Porsche heads and compared them
to
> Corvair heads (when they were available)?  Why do people keep trying to
make
> comparisons when they make no sense at all?  Just go out and buy a Porsche
> and stop complaining!
> RonH
>
> ----- Original Message ----- 
> From: "Roger Gault" <r.gault at sbcglobal.net>
> To: "Corvair List" <virtualvairs at corvair.org>
> Sent: Sunday, July 29, 2007 9:01 PM
> Subject: Re: <VV> Electric cooling fan results
>
>
> > 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
> >
> > ----- Original Message ----- 
> > From: <JVHRoberts at aol.com>
> > To: <mfrancis at wi.rr.com>; <virtualvairs at corvair.org>
> > Sent: Sunday, July 29, 2007 4:26 PM
> > Subject: Re: <VV> Electric cooling fan results
> >
> >
> >>
> >> The stock fan is horrible and inefficient. However, perhaps a 911 fan?
> >> Efficient, and since there's an electric motor, its CW rotation doesn't
> > matter.
> >> Still, it's reasonable to assume it'll take a BUNCH of HP to spin any
> > reasonable
> >>  fan.
> >> And it's probably simpler, etc., to come up with a  better fan in the
> > stock
> >> location with the stock drive. HEck, it's hard to do worse!
> >>
> >> In a message dated 7/29/2007 3:33:39 P.M. Eastern Daylight Time,
> >> mfrancis at wi.rr.com writes:
> >>
> >> The main  reason we are all interested in an electric cooling fan is
that
> >> it be  electric, for the obvious benefit of low drag on the engine at
top
> >> speed.  Also, the benefit of achieving aftercooling between runs at an
> >> autocross,  etc.
> >>
> >> Since the fan tested was a bladed fan, which has now shown to be
unable
> >> to effectively pressurize a Corvair engine cooling system, how  about
> >> retaining the stock impeller fan and mounting an electric fan motor  to
> >> the top of the existing fan pulley?
> >>
> >> I've found a fan motor  online, made as a factory replacement for the
> >> current GM V8 line. This  motor could be mounted on a tripod bracket
> >> above the fan pulley, with a  suitable drive connection between.
> >>
> >> It would appear that this setup  might have the benefits of electric
> >> cooling, with none of the low-pressure  drawbacks of a bladed fan. You
> >> wouldn't have to modify anything below your  upper shroud either.
> >>
> >> Since the testing group already has the test  vehicles still in hand,
> >> perhaps this mod could be readily done and a second  test performed,
> >> maybe with better results.
> >>
> >> Does this look like a  reasonable alternative to the testers?
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> ************************************** Get a sneak peek of the all-new
> >> AOL
> > at
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