| Re: [GMCnet] Cooling Shroud Mod [message #237465 is a reply to message #237425] |
Sat, 25 January 2014 16:52   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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John,
Without the video, or your more thorough data collection, I can't be sure,
but I'm pretty confident that there's always positive pressure inside my
radiator shroud unless it's defeated by the fan. All this duct work makes
sure 'most all the air impinging on the front of the radiator actually
passes through it:
http://www.gmcmhphotos.com/photos/g5632-under-bumper-air-scoop-amp-rock-guard.html
http://www.gmcmhphotos.com/photos/g6117-grille-to-radiator-duct.html
I don't have even a hint of an overheating problem, so this is all pretty
academic to me.
Ken H.
On Sat, Jan 25, 2014 at 10:48 AM, John R. Lebetski <gransport@aol.com>wrote:
>
>
> My "guess" is more like air is getting under the coach going down the road
> and creating a slight positive pressure in the engine compartment. Hence
> the flaps will stay closed. We need a full size wind tunnel with a front
> roller dyno and a smoke gennerator and video system. Anyone want to book
> that? Short of that, the hard fibreglas chin spoiler under the core support
> from Jim K made a huge difference at road speed on my coach preventing temp
> rise creep. I don't have the fender boat vents as to me they just don't
> flow enough CFM to warrent the chop job, though they might help a bit with
> hot soak at shut off. I know ftom experience the GM 76 C3 (a bottom feeder
> with no 'grill' ) would creep in temp on the highway on a hot day til the
> clutch fan came on for a 30 second cool down every few minuites over and
> over. Clearly a starved natural air flow situation. So we share more than
> just Corvette FRP!
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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