<VV> Fan and Shroud

[ScottyGrover at aol.com]

Actually, the diagram shows the bolt pattern and spacing for an EM fan, but 
 it will work on a LM unit.
The uneven spacing has to do with harmonics, which would affect the noise  
level. GM didn't give  a d**n about flow, just to make the Mag unit light  
(for belt life) and cheap.
 
Scotty
 
.
 
 
In a message dated 5/17/2012 11:42:17 A.M. Pacific Daylight Time,  
hmlinc at sbcglobal.net writes:

Well,  that was much more than a mere picture.  The diagram shows (I 
assume)  
a late model fan with 24 blades (vanes) evenly spaced.  The magnesium  fans 
have 11 blades and are not evenly spaced.  I know nothing about  fan 
technology, but now wonder if the spacing has anything to do with air  
flow. 
I've always assumed that the uneven spacing had to do with harmonics  and 
noise level.

Later, JR


----- Original Message -----  
From: <ScottyGrover at aol.com>
To:  <virtualvairs at corvair.org>
Sent: Thursday, May 17, 2012 9:37  AM
Subject: Re: <VV> CHT Re: valve seats and "Ping"


>  try this one
>
>
> In a message dated 5/16/2012 3:17:00 P.M.  Pacific Daylight Time,
> hmlinc at sbcglobal.net writes:
>
>  Got  pix?
> Later, JR
>
> ----- Original Message -----  
> From:  <ScottyGrover at aol.com>
> To:  <virtualvairs at corvair.org>
> Sent:  Wednesday, May 16, 2012  4:49 PM
> Subject: Re: <VV> CHT Re: valve seats  and  "Ping"
>
>
>>I have designed a series of fans for the  purpose of  improving the air 
>>flow
>> through a  Corvair's engine. the problem with  any of the factory stock
>>  units
>> is  that there is too  much space between the fan  and the upper shroud
>> (turkey  roaster)  which allows air  to go back by the fan (the technical
>> term
>>   is"reversion.")  my latest fan design involves a fan with blades  which
>> rise  up
>> into the airstream and a "fan  ring" which  fastens to the turkey roaster
>> and
>>  which minimises the gap  between the fan and fixed-position parts.   
This
>> allows less air  to revert over the fan blades, keeps  the air and the
>> pressure going  through between the fins  where it belongs.
>>
>> Scotty from   Hollyweird
>>