[DeTomaso] Blower mystery

[thomas]

Clockwise, as in "the opposite direction of the arrow"? That seem completely broken.

The way the shroud is designed the fan should spin in the direction the arrow shows, or ccw.

Thomas

14 aug 2012 kl. 00:11 skrev David D Fisher <fisher95020 at yahoo.com>:

> 
>     
> Thanks Tomas,
>  
> The wiki animation is in line with my thinking.       In the pics that I show,  the motor is turning clockwise (looking into the picture).  Note that I have flipped the fans already before I took these pics.   
>  
> David
> ________________________________
> 
> From: Tomas Gunnarsson <guson at home.se>
> To: David D Fisher <fisher95020 at yahoo.com>; Pantera mailing list <detomaso at realbig.com> 
> Sent: Monday, August 13, 2012 1:50 PM
> Subject: RE: [DeTomaso] Blower mystery
> 
> 
> I forgot, vane curvature varies based on what you're trying to achieve. The
> counterintuitive is sometimes more desirable. It's explained in this article
> a bit down.
> 
> http://en.wikipedia.org/wiki/Centrifugal_fan
> 
> What's always important is the direction of rotation.
> 
> Tomas
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of David D Fisher
> Sent: den 13 augusti 2012 21:18
> To: Pantera mailing list
> Subject: [DeTomaso] Blower mystery
> 
> 
> I have to start by saying that I wouldn't have believed this if I wasn't
> seeing it first hand...
> 
> My car came with the heater disconnected and the A/C leaking so I decided to
> pull the heater box apart and check everything before hooking back up.  I
> had two ruptured coils (frost bite, I suppose), but that's a different
> story...
> 
> When testing the fan, I noted that the fan blades appear to be oriented
> backwards compared to direction the motor is spinning them.  I turn the fan
> on and it moves a lot of air around the shrouds, but hardly anything moves
> up through the heater box.   ( Note that the motor only goes one direction,
> regardless off which polarity you wire it and it is turning in the direction
> that the arrow stamped on the housing says it should. )
> 
> Upon further inspection of the fans I note there is an arrow also stamped on
> them but it is pointing in the wrong direction compared to how the blade is
> designed.   (enlarge the second picture to full size to see the arrow, and
> the first picture to see the fan blade pitch)
> http://poca.com/index.php/gallery/?g2_itemId=36973
> 
> 
> Whoever assembled this in the factory did indeed match up the arrows from
> the fan blades to the arrow from the motor as expected, but the design
> appears wrong.   I took the fans off the shaft and flipped them over so that
> they scoop air from the center and throw it out to the shroud.   Walla! 
> lots of air moving through the box now!
> 
> Admittedly, this is still not quite correct as the shroud is somewhat like a
> turbo housing and airflow is going in the wrong direction for the shroud,
> but at least the fan is sucking in from the sides  pushing it into the
> shrouds.
> 
> So, here is the mystery.   Is it possible that someone at DeTomaso purchased
> the wrong direction fans from the supplier and an unwitting worker installed
> them according to the arrows and a number of Panteras out there have heater
> boxes that barely work on anything more than radiant heat?   Seems very
> strange indeed.
> 
> 
> David         
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
> 
> !DSPAM:50297bc813471374015390!
>