On Sunday 23 October 2005 02:00 pm, Dave1massey@cs.com wrote:
> In a message dated 10/22/2005 10:47:19 PM Central Standard Time,
>
> hoyt@cavtel.net writes:
>
> > It also surprises me that no one has mentioned constructing a radiator
> > fan shroud. That would certainly be cheaper and more efficient than an
> > electric pusher fan and, again, aluminum or PVC sheet - the latter easily
> > heat-shaped
> >
> > around a box form - would work well.
>
> Do you mean a shroud that couples the back side of the radiator to the fan
> so that the fan air must pass through the radiator rather than around it?
Kind of. It's a box on the back of the radiator that has a hole only large
enough for the fan blade. The relationship of the fan blade to the edge of
the shroud is important (not too deep or to far away). It actually improves
the efficiency of the fan at slow road speeds, but may cause some at higher
road speeds.
Here's a link with a picture:
http://www.yogisinc.com/Detail.cfm/-/Product_CD=CCI-70/Brand=98/product.htm
Note the lower left and right corners where a flexible vent has been added to
allow air at high road speeds (higher pressure) to exit the shroud to solve
that problem. I believe they are called "relief windows".
Here's another link that shows a shroud only. IIRC, these can be obtained in
various dimensions without a pre-cut hole.
http://littlejoesrodshop.com/walker1.htm
They don't look too difficult to fabricate out of black 1/8" PVC sheet goods.
--
Hoyt
=== This list supported in part by The Vintage Triumph Register
=== http://www.vtr.org
|