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| [GMCnet] Re: Shark Vents [message #368196 is a reply to message #368194] |
Sat, 25 December 2021 11:50   |
sgltrac
Messages: 2797
Registered: April 2011
Karma:
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Senior Member |
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Jim,
With the first 455 you built and a new high efficiency copper brass core in
the radiator, ceramic coated headers, Springfield ignition/ distributor,
Howell TBI W EBL, front mounted trans cooler, no ac condenser The rig would
drive around town and sit in traffic for hours in hot weather and the temps
would never get above 195. On the freeway however temps would steadily
climb in step with travel speed over 55 mph. At 65-70 mph the temps would
drift into the 210-220 range. After mention of the missing air deflectors
behind the grill( I believe it was you who suggested to improvise them if
they were absent) I went about a “temporary “ install of thin plywood
sheets cut to fit behind the grill to direct the air through the radiator.
$29 and an hour or so later at my brother in laws house in Hollywood they
were installed. On the trip home to Washington temps never went over 200 on
the interstate despite my travel speeds which at times were in the 80 mph
range.
Sully
Bellevue wa
On Sat, Dec 25, 2021 at 8:28 AM James Hupy wrote:
> 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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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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