| [GMCnet] Cooling Shroud Mod [message #237411] |
Sat, 25 January 2014 08:32  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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This is more than a little out of season, with the temperature outside
below freezing -- but that leaves me reluctant to go outside, so I generate
obsolete thoughts:
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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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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