In a message dated 10/23/2007 9:54:12 A.M. Pacific Daylight Time,
fishplate@charter.net writes:
---- Brian.L.Jones@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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