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| Re: New airbags [message #136424 is a reply to message #136419] |
Thu, 28 July 2011 12:16   |
Don Walton
Messages: 50
Registered: September 2007
Karma: 0
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Thanks for posting the pics, did you have any trouble figuring the angle on the u channel?
Don Walton in NC,
75 Glenbrook,
too many MGs
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| Re: New airbags [message #136430 is a reply to message #136424] |
Thu, 28 July 2011 13:10 |
nchapekis
Messages: 165
Registered: February 2004
Location: Ypsilanti, MI
Karma: 0
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Isn't this the same bag that the Frady's are selling at Southland?
Nick Chapekis
Ypsilanti, MI
former owner - 78 Kingsley
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| Re: New airbags [message #136465 is a reply to message #136430] |
Thu, 28 July 2011 17:49 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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| nchapekis wrote on Thu, 28 July 2011 13:10 |
Isn't this the same bag that the Frady's are selling at Southland?
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looks like the Frady system is only 6+" OD and rated at 3600Lb.
this system looks better to me. it is longer too allowing more travel.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] New airbags [message #136472 is a reply to message #136434] |
Thu, 28 July 2011 19:01 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Not the same bag at all as the southland one and much cheaper if the
mounting plates are easily made. Looks relatively simple. Marks bags look
like the ones I see on dump truck axles
Sully
77 Royale
On Thu, Jul 28, 2011 at 11:21 AM, Mark Grueninger <markgrue@hotmail.com>wrote:
>
>
> nchapekis wrote on Thu, 28 July 2011 13:10
> > Isn't this the same bag that the Frady's are selling at Southland?
>
>
>
> I am not familliar with that one. Might have saved me some work if I was
> though. Oh well metal and torch gas is cheap.
>
> Mark
> --
> Mark Grueninger 76 Palm Beach
> Valmeyer IL
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] New airbags [message #136474 is a reply to message #136472] |
Thu, 28 July 2011 19:30 |
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The Firestone air spring Southland uses is smaller OD than what Mark is
using. Southland also says the travel is within 1/4-inch to that of the
original design. The designed the plate and are having it fabricated to
their standards. The travel (up or down) is limited by the rest of the
system so an airbag with more travel is of little benefit unless you want
to blow your shocks off. The bag Southland is using is warranted by
Firestone for horizontal applications. Because of the system the
weight-bearing ability of the bag is measured differently, as I
understand. In other words, don't take 12,000 pounds and divide by six.
You all have the right to decide what you want and the type of ride you
want.
Byron Songer
Louisville, KY
Eastern States - http://www.gmceast.com
-----Original Message-----
From: Todd Sullivan <sgltrac@gmail.com>
Reply-To: <gmclist@temp.gmcnet.org>
Date: Thu, 28 Jul 2011 17:01:07 -0700
To: <gmclist@temp.gmcnet.org>
Subject: Re: [GMCnet] New airbags
>Not the same bag at all as the southland one and much cheaper if the
>mounting plates are easily made. Looks relatively simple. Marks bags look
>like the ones I see on dump truck axles
>
>Sully
>77 Royale
>
>On Thu, Jul 28, 2011 at 11:21 AM, Mark Grueninger
><markgrue@hotmail.com>wrote:
>
>>
>>
>> nchapekis wrote on Thu, 28 July 2011 13:10
>> > Isn't this the same bag that the Frady's are selling at Southland?
>>
>>
>>
>> I am not familliar with that one. Might have saved me some work if I
>>was
>> though. Oh well metal and torch gas is cheap.
>>
>> Mark
>> --
>> Mark Grueninger 76 Palm Beach
>> Valmeyer IL
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>_______________________________________________
>GMCnet mailing list
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>http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
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--
Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
http://www.songerconsulting.net
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| Re: [GMCnet] New airbags [message #136545 is a reply to message #136375] |
Fri, 29 July 2011 09:18 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Mark, could you post the dimensions of your plates and channels?
I might make a set of these just to have as spares. My OEM bags are in good
shape but you never know when one might fail.
On Thu, Jul 28, 2011 at 6:53 AM, Mark Grueninger <markgrue@hotmail.com>wrote:
>
>
> The pictures of the plates are up
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=39895&title=airbag-mounting-plates&cat=5827 I would be happy to answer any questions.
> --
> Mark Grueninger 76 Palm Beach
> Valmeyer IL
> _______________________________________________
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Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: [GMCnet] New airbags [message #136550 is a reply to message #136530] |
Fri, 29 July 2011 09:41 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mark,
The ride height for the rear is specified as 11 11/16" +/- 1/4" from the
ground to the top of the oval slot in the frame (MM X-7525 Page 3-34 Fig 70
Checking Vehicle Ride Height.)
From memory: the frame is 6" tall and the slot is about 3/4" "high."
Here's the ride height math for your GMC:
8 3/4" = Ground to bottom of frame
3 " = Distance from bottom of frame to middle of adjustment slot
3/8" = Distance from middle to the top of the slot (3/4" divided by 1/2)
12 1/8 = Ride height
If I've got all my figures right I agree that you're a bit too high. This is
what I thought when I saw in your pictures that the bag mounting flanges on
the bogie arms were not parallel but a bit spread apart at ride height. It
has been noted on the GMCnet that at the correct ride height you can draw a
straight line from the rear wheel spindle center to middle wheel spindle
center, it will intersect the center of the bogie pins; and the bag mounting
flanges will be parallel.
You note below that you need to drop your ride height by about 3/4" that
would result in a ride height setting of about 11 5/8" which is within spec.
BTW having the rear a bit low will increase caster (marginally) and improve
handling.
On to the shock absorbers; I suspect that the shocks you have on the rear of
your GMC are for a car or truck and not a GMC.
I reviewed the presentation that Manny Trovao made at the first GMC
Convention I attended (Santa Rosa 2008) and noted the following:
Quote:
Shock absorbers work on the principle of fluid displacement on both the
compression and extension cycle. A typical car or light truck will have more
resistance during its extension cycle then its compression cycle. The
compression cycle controls the motion of a vehicle's unsprung weight, while
extension controls the heavier sprung weight.
On our motorhomes, the front shock has more resistance on the compression
cycle than on the extension cycle. On the rear, it's the opposite, it has
more resistance on the extension cycle than on the compression cycle.
Unquote
A bit further along in the presentation he has photos of shocks that have
been cutaway to show their innards. They are AC-Delco, Caspro, KYB, and
Bilstein.
Under the picture of the AC-Delco shock he states:
Quote
This is the original AC/Delco that came with the Motorhome. It's a twin tube
design. Inner tube chamber. It is no longer made
Unquote
If you are a member of GMCMI you can click on the link below; log in and
review the whole presentation:
http://www.gmcmi.com/mem-bers/TechHandouts/GMC_Shocks.pdf
I have only been a GMC owner and GMCnet member for four years and to date I
have never heard anyone note that they had "new looking" AC-Delco shocks on
their GMC. AFAIK the only shocks currently available for the GMC are made by
KYB or Bilstein.
In discovered all of this because when I drove The Blue Streak from Mudgee
(country NSW) back to Sydney and it was all over the road. During my
research on how to fix it I discovered there was a bunch of stuff wrong with
the front end and on the rear end the shocks that a PO had installed were
from a car.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Mark Grueninger
They are AC-Delco Performer shocks acording to the sticker. Farily new by
the looks of them. they were on there when i got it last year. I have not
gotten around to changing them yet. The distance to the bottom of the frame
is about 8 3/4 inches acording to my tape measure. The front is still a
little high as it looks like i have the same problem as the guy in the other
thread on ride height. Need to drop both sides about 3/4 inch.
Mark
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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] New airbags [message #136562 is a reply to message #136550] |
Fri, 29 July 2011 10:54 |
 |
mgrue
Messages: 192
Registered: October 2010
Location: Valmeyer IL
Karma: 0
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Senior Member |
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The shocks are on my TO DO list not at the top but close. I like the quality of the bilstiens we use on our dirt late model stock car so I will probably go with them. Different animal I know but I would think the quality is still there. I will see. I see Jimk has them so I will more then likely get them from him. I intend to get some adjustable links for the rear ride height and see what i can do with the front torsion bars to get the ride height in line. have 1 more camping trip in august then will start working on it. I think you are really close with the rear height numbers. Thats about what i figured. Thanks for your input I appreciate it.
Mark
| Robert Mueller wrote on Fri, 29 July 2011 09:41 |
Mark,
The ride height for the rear is specified as 11 11/16" +/- 1/4" from the
ground to the top of the oval slot in the frame (MM X-7525 Page 3-34 Fig 70
Checking Vehicle Ride Height.)
From memory: the frame is 6" tall and the slot is about 3/4" "high."
Here's the ride height math for your GMC:
8 3/4" = Ground to bottom of frame
3 " = Distance from bottom of frame to middle of adjustment slot
3/8" = Distance from middle to the top of the slot (3/4" divided by 1/2)
12 1/8 = Ride height
If I've got all my figures right I agree that you're a bit too high. This is
what I thought when I saw in your pictures that the bag mounting flanges on
the bogie arms were not parallel but a bit spread apart at ride height. It
has been noted on the GMCnet that at the correct ride height you can draw a
straight line from the rear wheel spindle center to middle wheel spindle
center, it will intersect the center of the bogie pins; and the bag mounting
flanges will be parallel.
You note below that you need to drop your ride height by about 3/4" that
would result in a ride height setting of about 11 5/8" which is within spec.
BTW having the rear a bit low will increase caster (marginally) and improve
handling.
On to the shock absorbers; I suspect that the shocks you have on the rear of
your GMC are for a car or truck and not a GMC.
I reviewed the presentation that Manny Trovao made at the first GMC
Convention I attended (Santa Rosa 2008) and noted the following:
Quote:
Shock absorbers work on the principle of fluid displacement on both the
compression and extension cycle. A typical car or light truck will have more
resistance during its extension cycle then its compression cycle. The
compression cycle controls the motion of a vehicle's unsprung weight, while
extension controls the heavier sprung weight.
On our motorhomes, the front shock has more resistance on the compression
cycle than on the extension cycle. On the rear, it's the opposite, it has
more resistance on the extension cycle than on the compression cycle.
Unquote
A bit further along in the presentation he has photos of shocks that have
been cutaway to show their innards. They are AC-Delco, Caspro, KYB, and
Bilstein.
Under the picture of the AC-Delco shock he states:
Quote
This is the original AC/Delco that came with the Motorhome. It's a twin tube
design. Inner tube chamber. It is no longer made
Unquote
If you are a member of GMCMI you can click on the link below; log in and
review the whole presentation:
http://www.gmcmi.com/mem-bers/TechHandouts/GMC_Shocks.pdf
I have only been a GMC owner and GMCnet member for four years and to date I
have never heard anyone note that they had "new looking" AC-Delco shocks on
their GMC. AFAIK the only shocks currently available for the GMC are made by
KYB or Bilstein.
In discovered all of this because when I drove The Blue Streak from Mudgee
(country NSW) back to Sydney and it was all over the road. During my
research on how to fix it I discovered there was a bunch of stuff wrong with
the front end and on the rear end the shocks that a PO had installed were
from a car.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
GMCnet mailing list
Unsubscribe or Change List Options:
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Mark Grueninger 76 Palm Beach
Valmeyer IL
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