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| Re: [GMCnet] Reaction Arm Mod Mockup [message #91390 is a reply to message #91374] |
Wed, 07 July 2010 10:17   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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Coming from someone who ( at least thinks ) understands the reaction arm concept I don't see how the demo explains it.
It's a LOT better than nothing of course.
I think you need to simulate the weight of the coach and show that the weight on the rear wheel decreases while the weight on the front wheel increases, without the linkage, and remains the same with the linkage.
This would also require, I think, linking the wheels together to simulate the road friction trying to rotate the wheels
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| [GMCnet] AC question [message #91394 is a reply to message #91390] |
Wed, 07 July 2010 10:39 |
mckinfam
Messages: 14
Registered: July 2008
Karma: 0
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Junior Member |
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First off thanks to the gmclist and its members for the informative and lively
chat on this list.
While still coachless in Arroyo Grande, I am learning a lot about the GMC and
have gone from being completely enamored with these rigs to a more
moderate/realistic appreciation for them (like fine wine or a solid marriage?).
I will own one, one of these days.
My question for the day pertains to my '91 Suburban AC system. We are getting
ready to trailer the Fleetwood up into the Sierras across the central valley of
CA (read HOT). We have done this annually for the last 10 years. In the last
few years the AC system has given up the ghost. The compressor is still cycling
and I suspect that the R-12 has leaked.
While driving w/o AC doesn't bother me too much, the family really wants AC this
year...
Having the system "professionally" changed to r134 is cost prohibative at this
time, and having the system recharged with R-12 is not much cheaper. I picked
up a few cans of Freeze-12, but have held off using them because its a blend of
refrigerants that contain 134. I'm not sure how this will work or affect my
system. I also have Freeze-12 lubricant and stop leak, but they are ester
based. Since R-12 is mineral oil based I decided against using the stop leak
and lubricant.
I figured that this group would be a good place to inquire about this stuff, as
from reading the banter, you are all a very creative/helpful bunch. I
appreciate your sage advice...
Kelly McKinley
Coachless in AG, Ca
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| Re: [GMCnet] Reaction Arm Mod Mockup [message #91395 is a reply to message #91390] |
Wed, 07 July 2010 10:41 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Keith,
I did consider using a rear as well as a center wheel, but decided it was
not worth the complication of construction or demonstration. I think
everyone understands pretty well the "pole vaulting" and the transfer of
weight from rear to center.
What's less understood, and is, I think, demonstrated by the mockup, the
inability of the OEM suspension to transfer braking forces through the
chassis to the front wheels, through that long lever arm. That, really, is
more fundamental to understanding the 4-link suspension than just talking
about weight transfer.
I hope the flexible "front suspension" will illustrate the principle. We'll
see in a couple of days how the Dixielanders react to it.
Thanks for your comments; I WILL keep them in mind.
Ken H.
Americus, GA
'76 X-Birchaven
www.gmcwipersetc.com
On Wed, Jul 7, 2010 at 11:17 AM, Keith V <my427v8@hotmail.com> wrote:
>
>
> Coming from someone who ( at least thinks ) understands the reaction arm
> concept I don't see how the demo explains it.
> It's a LOT better than nothing of course.
>
> I think you need to simulate the weight of the coach and show that the
> weight on the rear wheel decreases while the weight on the front wheel
> increases, without the linkage, and remains the same with the linkage.
>
> This would also require, I think, linking the wheels together to simulate
> the road friction trying to rotate the wheels
> --
>
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GMCnet mailing list
List Information and Subscription Options:
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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] AC question [message #91406 is a reply to message #91394] |
Wed, 07 July 2010 12:30 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Kelly,
In a thread last year Jim Bounds said he had been using Freeze 12 for 4 years...
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=58096&rid=904&srch=freeze+canada+duracool#msg_58096
Duracool seems to have more support on the GMCnet --
Anyway, information for your decision.
Dennis
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Kelly & Lisa McKinley <mckinfam@sbcglobal.net>
My question for the day pertains to my '91 Suburban AC system. We are getting
eady to trailer the Fleetwood up into the Sierras across the central valley of
A (read HOT). We have done this annually for the last 10 years. In the last
ew years the AC system has given up the ghost. The compressor is still cycling
and I suspect that the R-12 has leaked.
hile driving w/o AC doesn't bother me too much, the family really wants AC this
year...
Having the system "professionally" changed to r134 is cost prohibative at this
ime, and having the system recharged with R-12 is not much cheaper. I picked
p a few cans of Freeze-12, but have held off using them because its a blend of
efrigerants that contain 134. I'm not sure how this will work or affect my
ystem. I also have Freeze-12 lubricant and stop leak, but they are ester
ased. Since R-12 is mineral oil based I decided against using the stop leak
nd lubricant.
I figured that this group would be a good place to inquire about this stuff, as
rom reading the banter, you are all a very creative/helpful bunch. I
ppreciate your sage advice...
Kelly McKinley
oachless in AG, Ca
______________________________________________
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] AC question [message #91424 is a reply to message #91406] |
Wed, 07 July 2010 15:58 |
larry churchwell
Messages: 9
Registered: June 2010
Karma: 0
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Junior Member |
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fix the leak first befor you charge the system and if the system is dead no
r12 replace thr expation valve
On Wed, Jul 7, 2010 at 1:30 PM, <dennisfsexton@aol.com> wrote:
>
> Kelly,
>
> In a thread last year Jim Bounds said he had been using Freeze 12 for 4
> years...
>
>
> http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=58096&rid=904&srch=freeze+canada+duracool#msg_58096
>
> Duracool seems to have more support on the GMCnet --
>
> Anyway, information for your decision.
>
> Dennis
>
>
> Dennis Sexton
> 73 GMC
> Germantown, TN
> USA
>
>
>
> -----Original Message-----
> From: Kelly & Lisa McKinley <mckinfam@sbcglobal.net>
>
> My question for the day pertains to my '91 Suburban AC system. We are
> getting
> eady to trailer the Fleetwood up into the Sierras across the central valley
> of
> A (read HOT). We have done this annually for the last 10 years. In the
> last
> ew years the AC system has given up the ghost. The compressor is still
> cycling
> and I suspect that the R-12 has leaked.
> hile driving w/o AC doesn't bother me too much, the family really wants AC
> this
> year...
> Having the system "professionally" changed to r134 is cost prohibative at
> this
> ime, and having the system recharged with R-12 is not much cheaper. I
> picked
> p a few cans of Freeze-12, but have held off using them because its a blend
> of
> efrigerants that contain 134. I'm not sure how this will work or affect my
> ystem. I also have Freeze-12 lubricant and stop leak, but they are ester
> ased. Since R-12 is mineral oil based I decided against using the stop
> leak
> nd lubricant.
> I figured that this group would be a good place to inquire about this
> stuff, as
> rom reading the banter, you are all a very creative/helpful bunch. I
> ppreciate your sage advice...
> Kelly McKinley
> oachless in AG, Ca
> ______________________________________________
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] AC question [message #91495 is a reply to message #91394] |
Wed, 07 July 2010 23:26 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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It's funny, but after you get your coach that enamored feeling grows!
I just pulled a vacuum on my AC system with an inexpensive Harbor Freight vacuum pump and shot some duracool into the system. It's $10 / can and my motorhome took a little less than 3 cans to achieve 20 lbs on the suction side.
Larry Davick
The Mystery Machine
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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