| [GMCnet] Re: Shark Vents [message #368194 is a reply to message #368193] |
Sat, 25 December 2021 10:28   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The very last coaches with the 403 engines had the best air deflectors in
front of the radiator. There are many pieces involved, some are sheet
metal, and some are a flexible material similar to truck mud flaps. None of
the air that enters the grill area is left undirected. It all goes through
the evaporator of the A.C. and then through the radiator core.
Todd Sullivan's coach was a 77 with a 455. It contains none of the
air deflectors that my 78 has. It is prone to overheating at steady speed
cruise as well as steep climbs. He improvised some plywood pieces held in
with wire and tie wraps, when on a trip in Southern California. They
lowered the operating temps by enough to allow him to travel without
stopping. I now own that coach, and before it goes back on the road, it
will have reproduced air deflectors like the ones on my 78. Also needs a
new front lower cap and grill, thanks to a deer that was in the wrong place
at the same time as the coach. Then we will see how effective those
deflectors are.
Jim Hupy
Salem, Oregon
On Sat, Dec 25, 2021, 7:55 AM John R. Lebetski
wrote:
> They may help with venting heat soak at shut down. That’s all. The rest is
> owner feel good because they feel hot air coming out. The engine room,
> unlike a boat has no floor and is wide open. The air that enters the
> radiator is the same temp with or without the vents. Yes the engine room
> area
> tends to trap air underneath and become higher pressure, but if you look
> at the cross sectional area of the vents compared to the radiator and CFM
> the
> fan CAN move, it’s not a helpful factor. Not only that on most vent jobs,
> cut that area by 50% as only half if the vent functions due to step
> intrusion. The biggest help in cooling for me was the Flowkooler 195
> stat, and the under core support air deflector, both from Applied.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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