| Re: [GMCnet] Cooling Shroud Mod [message #237414 is a reply to message #237411] |
Sat, 25 January 2014 08:50   |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma:
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Senior Member |
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Ken, Thanks for the update on that mod. Most modern vehicles are pretty
crowded in the engine compartment when compared to the GMC motorhome.
On 1/25/2014 9:32 AM, Ken Henderson wrote:
> Some of you may remember that back in the spring I modified my Frank
> Jenkins fiberglass radiator fan shroud to investigate air stagnation
> effects. What I did was cut windows all around the shroud and cover them
> with spring-loaded flaps, copying what many modern vehicles have.
>
> The idea was that the rotating fan, when not engaged, obstructs air flow,
> creating a high pressure zone behind the radiator and consequently
> decreasing cooling. The doors were expected to open under those conditions
> and delay fan engagement. I'd thought I might aim a video camera at the
> doors to observe their operation, but never did (should have let Dan
> install it under his glass hatch). However, there's no question that if
> there were pressure there, the doors would open -- they're very lightly
> spring-loaded to the closed position.
>
> About half way through my 'round-the-USA summer trip, I decided to try
> sealing the doors to observe changes in temperature & fan operation. With
> duct tape I closed all but the two small doors unreachable at the top of
> the shroud. I never could recognize ANY difference in temperature, fan
> operation, nor noise. I've now removed the tape; during only limited
> driving, I still observe no change.
>
> Conclusion: Don't bother cutting holes in your radiator shroud.
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI & EBL
> www.gmcwipersetc.com
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