<VV> Conditions for cooling fans > Astro 1 engine fans

[BBRT]

There are a couple of issues to consider.
1. For a street car, low speed, heat soak has to be overcome. Similarly a 
race car at slow pace, like under a yellow or on the grid.
2. For either a street or race car, roatating weight, momentum and inertia 
are important considerations for acceleratiing.
3. For a race car, high rpm cooling is a must. High rpm  is > 6500 rpm - 
Observations indicate engine load in 4th at high speed/rpm generates a lot 
of heat.
4. For a race car, the mentioned inertia upon gear changes is critical. 
Typically on a "mule drive" with reduced diameter fan, my experience 
indicates the belt problem occurs with two downshifts at the end of a high 
speed/rpm 4th gear straight.
5. IF, the race car is gently speed-shifted, the belt survives upshifts even 
at >7000 rpm. Assumes slick belt, properly adjusted with proper spring idler 
tension.
6. IMHO. YMMD.

Chuck S
BBRT
----- Original Message ----- 
From: <BobHelt at aol.com>


> Jim,
> Sorry I can't answer your questions, but I can tell you that according to
> the test engineer's report on the Astro 1 engine, the horsepower to drive
> the  fans was just about the same as required for the stock Corvair 
> engines.
> I.e., about 27 hp at 6000 rpm engine speed. Of course belt life will be 
> much
> better for the Astro setup. So we can see that the Astro 1's fans are no
> more efficient than the Corvair's fans.
> Regards,
> Bob Helt
>
>
> In a message dated 3/19/2013 7:22:20 A.M. US Mountain Standard Time,
> simpsonj at verizon.net writes:
>
> the  cooling system was also radically different in that it used three
> blowers
> (squirrel cage?) on a single horizontal shaft.  The fan  routing was
> simplified to eliminate the 90 degree bends and looks much more  like a
> conventional  layout.
>
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