Alternates Re: <VV> Electric cooling fan results

[FrankCB at aol.com]

To give us an idea of just how much electric  current is needed, 14 hp is 
equivalent to about 10-1/2 KW.  If we try to  draw this much from a 12 volt 
battery it will equal a current flow of almost 900  amps.  This is probably about 
FIVE times what the Corvair starter draws so  how long can the battery supply 
this much current?  With the Corvair  alternator supplying about 37 amps, for 
every ONE MINUTE we run the electric  fan, we have to run the alternator TWENTY 
FOUR minutes or even more since it has  to also supply other electrical needs 
at the same time (like ignition).
    Seems to me it would be much better to fabricate an  electric clutch to 
be able to engage and disengage the stock fan as needed to  keep the temp under 
control.
    Frank "sparky" Burkhard
 
In a message dated 7/29/2007 3:54:21 PM Eastern Daylight Time,  
BobHelt at aol.com writes:

In a  message dated 7/29/2007 12:33:39 PM US Mountain Standard Time,   
mfrancis at wi.rr.com writes:

how  about
retaining the stock  impeller fan and mounting an electric fan motor  to
the top of the  existing fan pulley?



Not to throw cold water on your  idea.....but it won't work!
If it took 14 hp to drive the stock fan at 6320  rpm (engine speed  4000), 
then it will STILL take 14 hp from an  electric motor to drive the fan.  And 
even 
if you could mount such a  motor on top of the fan, where are you going  to 
get the electric  current to run it?
Regards,
Bob Helt







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