Dave,
The fan that is on my red Spit has the following note in the installation
instructions:
"NOTE: These electric cooling fans are designed to PUSH or PULL air,
depending on the installation. Fans are preassembled in the PULL
configuration. If your application requires that you push air,
please follow the steps listed below-
(A) Remove the retaining clip "C" and fan blade.
(B) Turn the fan blade over and realign to properly fit over the
roll pin in the motor shaft.
(C) Press fan blade in place and reinstall the "C" clip on the
motor shaft."
The installation onto the radiator makes the fan motor face the radiator in
either case. So Reversing the blade id the only thing that is required to
make the thing push or pull as required.
I'm still stickin' to my story!
Joe
David Massey wrote:
>
> Message text written by Joe Curry
> >Fan rotation may be changed by one of two methods (depending on the
> particular fan.
>
> 1. Since DC fans run in the direction of the current flow, reversing the
> wiring will change the direction of rotation.
> 2. Some (if not most) of these fans have a reversible blade assembly that
> can be removed and turned around to change a "sucker" to a "blower". Check
> the fan's instruction sheet for notes on this possibility.
>
> That's my story and I'm stickin'' to it!!!
> <
>
> Well, Joe, stick this!
>
> 1) True. At least for permanent magnet motors which virtually all fan
> motors are.
>
> 2) Removing the fan blades and reinstalling them the other way around will
> not reverse air flow. However, fan blades are optimized for a particular
> direction and will perform poorly when run in the other direction. If you
> look at a fan blade from the side you will see that it is not straight. It
> starts out fairly flat (where it grabs the air) and becomes increasingly
> sharp toward the end where it "flings" the air in the direction of air
> flow. When you reverse the rotation (by swapping the leads) it will not
> move as much air but by reversing the fan blades you restore the optimized
> rotation of the blades.
>
> So, what you meant to say is that to reverse fan rotation you must do 1.
> AND 2. , right?
>
> Dave
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