Home » Public Forums » GMCnet » [GMCnet] The “best air bag choice”
| Re: [GMCnet] The "best air bag choice" [message #325343 is a reply to message #325295] |
Mon, 23 October 2017 18:15   |
bryant374
Messages: 563
Registered: May 2004
Location: Pleasant Valley, NY 12569
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johnd01
snip....
Over the years the allowable GVW has increased. Did the increase come with
stronger parts or did the engineers realize they could up the numbers with
the original desine?
Answer; "Both".
1973 Initial = 10,500
1973 late & 74 = 11,200
1975, 76, 77 =11,700
1978 = 12,500
I had been told by the GMC MotorHome engineers, the supported increase in GVW for the early change was due to design changes (there were many). The last change was due primarily to the engineering evaluation that the then current design supported a 12,500 GVW.
Bill Bryant
PO 1976~PB (owned 34 years)
1914 Ford (owned 70 years)
1965 Corvette (owned 39 years)
GMC Motorhome History
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| Re: [GMCnet] The "best air bag choice" [message #325354 is a reply to message #325343] |
Mon, 23 October 2017 20:01 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Bill, we know one change was increasing the size of the bogie pin from
1-1/4" to 1-3/8", but they also drilled a deeper oil passage when they did
so. They also added stiffeners and gussets to the front lower control arms,
though front axle rating didn't change.
But what else did they do that would actually increase rear load-carrying
ability? I would expect heavier frame rails, more gussets, heavier bogie
castings, etc. But I don't recall any changes like that.
It would help to know what salvage parts might be preferred.
Rick "not personally worried with a 9400-pound coach" Denney
On Mon, Oct 23, 2017 at 7:16 PM Bill Bryant wrote:
> johnd01
>
> snip....
> Over the years the allowable GVW has increased. Did the increase come with
> stronger parts or did the engineers realize they could up the numbers with
> the original desine?
>
> Answer; "Both".
>
> 1973 Initial = 10,500
>
> 1973 late & 74 = 11,200
>
> 1975, 76, 77 =11,700
>
> 1978 = 12,500
>
> I had been told by the GMC MotorHome engineers, the supported increase in
> GVW for the early change was due to design changes (there were many). The
> last change was due primarily to the engineering evaluation that the then
> current design supported a 12,500 GVW.
>
> --
> Bill Bryant
> 1976~PB
> 1914 Ford
> 1965 Corvette
> GMC MH History CD & GMC Showroom DVD
> Workprint DVD GMC development 11-70 to 3-71
> http://bdub.net/billbryant/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: [GMCnet] The "best air bag choice" [message #325356 is a reply to message #325343] |
Mon, 23 October 2017 20:19 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
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Thanks Bill,
So my 75 Avion TZE064V101164 needs to say with 11,200 where the real 75 to
78 should be ok with 12,500 GVW.
On Mon, Oct 23, 2017 at 4:15 PM, Bill Bryant
wrote:
> johnd01
>
> snip....
> Over the years the allowable GVW has increased. Did the increase come with
> stronger parts or did the engineers realize they could up the numbers with
> the original desine?
>
> Answer; "Both".
>
> 1973 Initial = 10,500
>
> 1973 late & 74 = 11,200
>
> 1975, 76, 77 =11,700
>
> 1978 = 12,500
>
> I had been told by the GMC MotorHome engineers, the supported increase in
> GVW for the early change was due to design changes (there were many). The
> last change was due primarily to the engineering evaluation that the then
> current design supported a 12,500 GVW.
>
> --
> Bill Bryant
> 1976~PB
> 1914 Ford
> 1965 Corvette
> GMC MH History CD & GMC Showroom DVD
> Workprint DVD GMC development 11-70 to 3-71
> http://bdub.net/billbryant/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] The "best air bag choice" [message #325365 is a reply to message #325354] |
Tue, 24 October 2017 07:47 |
bryant374
Messages: 563
Registered: May 2004
Location: Pleasant Valley, NY 12569
Karma: 1
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Not quite, 1975,76,77 were 11,700.
1978 was 12,500.
Bill Bryant
PO 1976~PB (owned 34 years)
1914 Ford (owned 70 years)
1965 Corvette (owned 39 years)
GMC Motorhome History
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| Re: [GMCnet] The "best air bag choice" [message #325371 is a reply to message #325281] |
Tue, 24 October 2017 09:41 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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There are many ways the load a tire/wheel system esperiences can be changed. Extended crosswinds, hard cornering, and braking at speed are some that come to mind. Also, all these load shift's severity increase considerably at higher speed. Wheel/tire manufacturers design the limits of their systems with the understanding that at full loaded weight, you may have situations where a wheel\tire are loaded far more than steady state driving. For example, an emergency lane change at 70mph, or a panic stop at those same speeds. If designers did not build the capability to handle these additional loads into their systems, then you would hear stories of wheels coming apart, and tires blowing out on hard corners, etc and the associated death and destruction those failures would cause.
Now I'm not saying you should regularly go driving around in an overloaded coach. Not at all. But I would not hesitate at all to drive a coach for short distances at low speed on 3 rear wheels. Low speed, steady state driving loads are much lower than the coach regularly sees at high speed.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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