Home » Public Forums » GMCnet » [GMCnet] Radiator Cooling Baffles
| [GMCnet] Radiator Cooling Baffles [message #272408] |
Sat, 21 February 2015 14:52  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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I’m curious if anyone has seen tangible results from installing the radiator baffles. I see Ken H’s excellent photographs showing his mud-flap baffles, and the reasoning is sound, but I’m wondering if they really make a difference?
Making a set of baffles would be kind of fun.
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Radiator Cooling Baffles [message #272410 is a reply to message #272408] |
Sat, 21 February 2015 15:32  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Larry,
I put a pair I got from Frank Jenkins made out of tractor trailer mud flaps on Double Trouble and yes it made a difference; did I
record before and after temps, no.
http://www.gmcmhphotos.com/photos/g6532-air-dams.html
GMC incorporated them, however, I don't know when they did that.
Regards,
Rob M.
-----Original Message-----
From: Larry Davick
I'm curious if anyone has seen tangible results from installing the radiator baffles. I see Ken H's excellent photographs showing
his mud-flap baffles, and the reasoning is sound, but I'm wondering if they really make a difference?
Making a set of baffles would be kind of fun.
Larry Davick
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Radiator Cooling Baffles [message #272412 is a reply to message #272410] |
Sat, 21 February 2015 15:57 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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They were incorporated when then went to the 403 engine at TZE167V101285 for the motorhome, TZE337V101287 for the 23’ TransMode and TZE367V101312. There is a drawing that shows the baffle layout, but I have not been able to locate as of yet. The baffles do make a difference as they control the air flow and force it thru the radiator and not allow it to escape around the radiator.
J.R. Wright
30' Buskirk Stretch
Michigan
On Location in Tucson
> On Feb 21, 2015, at 2:32 PM, Rob Mueller wrote:
>
> Larry,
>
> I put a pair I got from Frank Jenkins made out of tractor trailer mud flaps on Double Trouble and yes it made a difference; did I
> record before and after temps, no.
>
> http://www.gmcmhphotos.com/photos/g6532-air-dams.html
>
> GMC incorporated them, however, I don't know when they did that.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Larry Davick
>
> I'm curious if anyone has seen tangible results from installing the radiator baffles. I see Ken H's excellent photographs showing
> his mud-flap baffles, and the reasoning is sound, but I'm wondering if they really make a difference?
>
> Making a set of baffles would be kind of fun.
>
> Larry Davick
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Radiator Cooling Baffles [message #272413 is a reply to message #272410] |
Sat, 21 February 2015 16:05 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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The coach I'm presently working on
has a brass radiator, no dash a/c, and 7 blade steel OEM fan, w/ 1 piece
molded plastic shroud. It has a fuel injected, cammed, 455 w/ K-a heads.
Radiator was re-cored with another row of tubes. It always would run over
205° at 65 - 70 mph, not towing or climbing. Owner fabricated wing type
deflectors like the Royale 78 coaches have. Temps were lowered to 185° at
same speed. Yes, they work very well. I think that the "possum scoop" type
made from truck mud flap material will show similar results. Your
experiences may vary.
Jim Hupy
Salem, Or
78 GMC Royale
On Feb 21, 2015 1:32 PM, "Rob Mueller" wrote:
> Larry,
>
> I put a pair I got from Frank Jenkins made out of tractor trailer mud
> flaps on Double Trouble and yes it made a difference; did I
> record before and after temps, no.
>
> http://www.gmcmhphotos.com/photos/g6532-air-dams.html
>
> GMC incorporated them, however, I don't know when they did that.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Larry Davick
>
> I'm curious if anyone has seen tangible results from installing the
> radiator baffles. I see Ken H's excellent photographs showing
> his mud-flap baffles, and the reasoning is sound, but I'm wondering if
> they really make a difference?
>
> Making a set of baffles would be kind of fun.
>
> Larry Davick
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Radiator Cooling Baffles [message #272428 is a reply to message #272408] |
Sat, 21 February 2015 17:55 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Larry,
The Chevrolet P-30 Chassis Owner's Manual, available from bdub.net, has a
detailed appendix of recommendations to upfitters about radiator ducting.
That, plus my experience with other motorhomes on that chassis, made me
very surprised at the absence of baffles on my '76 GMC. I'm still
surprised at the absence of a top baffle. However, since I never had an
overheating problem, I didn't install them until 2012:
http://www.gmcmhphotos.com/photos/g6117-grille-to-radiator-duct.html
I'm glad I've got them now, but I really can't testify to any cooling
improvement -- I didn't have a cooling problem before and I still don't --
my temperature stays at 196*F to 198*F. But I do have a convenient shelf
for tools when working under the hoods, and some handy storage space (I
keep a small plastic dishpan on the top baffle for spare oil, etc.). I
also an additional obstacle to remove when I want to work in front of the
radiator (which is fortunately not often). I will say that I wouldn't
bother with only side baffles.
Ken H.
On Sat, Feb 21, 2015 at 3:52 PM, Larry Davick wrote:
> I’m curious if anyone has seen tangible results from installing the
> radiator baffles. I see Ken H’s excellent photographs showing his mud-flap
> baffles, and the reasoning is sound, but I’m wondering if they really make
> a difference?
>
> Making a set of baffles would be kind of fun.
>
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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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| Re: [GMCnet] Radiator Cooling Baffles [message #272485 is a reply to message #272428] |
Sun, 22 February 2015 21:45 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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Ken Henderson wrote on Sat, 21 February 2015 17:55Larry,
...... I'm glad I've got them now, but I really can't testify to any cooling
improvement -- I didn't have a cooling problem before and I still don't --
my temperature stays at 196*F to 198*F. But I do have a convenient shelf
for tools when working under the hoods, and some handy storage space (I
keep a small plastic dishpan on the top baffle for spare oil, etc.). I
also an additional obstacle to remove when I want to work in front of the
radiator (which is fortunately not often). I will say that I wouldn't
bother with only side baffles. Ken H.
I plan to copy Ken's baffle ideas. But find this P30 drawing an interesting comparison.
http://www.gmcmhphotos.com/photos/miscellaneous-bryant-stuff/p31393-baffle.html
Here the horizontal baffle is at the bottom, negating my JR Wright air dam. None at the top. And the triangle shape of the side baffles would seem to not extend to the grill?
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Radiator Cooling Baffles [message #272486 is a reply to message #272428] |
Sun, 22 February 2015 21:45 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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Ken Henderson wrote on Sat, 21 February 2015 17:55Larry,
...... I'm glad I've got them now, but I really can't testify to any cooling
improvement -- I didn't have a cooling problem before and I still don't --
my temperature stays at 196*F to 198*F. But I do have a convenient shelf
for tools when working under the hoods, and some handy storage space (I
keep a small plastic dishpan on the top baffle for spare oil, etc.). I
also an additional obstacle to remove when I want to work in front of the
radiator (which is fortunately not often). I will say that I wouldn't
bother with only side baffles. Ken H.
I plan to copy Ken's baffle ideas. But find this P30 drawing an interesting comparison.
http://www.gmcmhphotos.com/photos/miscellaneous-bryant-stuff/p31393-baffle.html
Here the horizontal baffle is at the bottom, negating my JR Wright air dam. None at the top. And the triangle shape of the side baffles would seem to not extend to the grill?
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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