[TR] Push or pull

[MMoore8425 at aol.com]

In a message dated 10/23/2007 9:54:12 A.M. Pacific Daylight Time,  
fishplate at charter.net writes:

----  Brian.L.Jones at gsk.com wrote: 
> My instinct leads me to believe a puller  will move more air through a 
> radiator than a pusher.

I'm not  sure of the test parameters, but a properly installed puller will 
flow better  than a properly installed pusher.

As I see it, a proper installation of  a fan includes a shroud.  If you 
shroud a pusher, then when the vehicle  is in motion and the fan is ~not~ 
energized, air is blocked from normal  laminar flow through the radiator by the shroud. 
 With a puller in the  same configuration, air hits all points of the 
radiator face more or less  equally (small mouth notwithstanding), so that more flow 
is experienced.   The rear shroud may limit total flow somewhat, though, maybe.

When the  fan is energized, then there may not be as much difference between 
pusher and  puller - probably both are more effective at moving air through 
the exchanger  than the stock (unshrouded) fan.




"Better" is the enemy of "good enough". 
 
The way I look at it is; so what if a pusher isn't as efficient as a  puller  
(which its not), is the fan good enough to do what you want it to  do?
 In my case, the answer was "yes" on both my Stag and my TR3 which I  drive 
in the summer time on (hot) California freeways.
 
Mike Moore 
 
 



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