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| [GMCnet] 1-Ton Installation [message #152398] |
Sat, 10 December 2011 10:48  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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One additional "conclusion" I think worth mentioning. Not all of our coaches were going down the road at the specified factory ride height before the installation of the 1 ton front end. We know that rear ride height plays a significant role in determining front ride height. If the rear was low (most likely) or high to begin with and you reset it to factory spec (as you should) after the 1 ton front is installed, the amount your front will need to be raised will differ significantly from another coach even if the torsion bars on the two coaches have exactly the same strength. So, yes, there certainly does appear to be higher torsion bar loading with the wider spacing required to clear the larger rotors on the 1 ton front end, but torsion bar loading and torsion bar age/strength are only one of several factors effecting resulting front ride height.
I am going to ask Jim H. (tech VP for GMCWS) to allow me to set up an experiment at the upcoming GMCWS Casa de Fruta spring rally. As the coaches all come in I would like to quickly measure and record front and rear ride height. That will give us one touch point on how our coaches are now set going down the road. So, whether that distribution of ride heights is a result of torsion bars getting tired, owner aesthetic preference, or just the whim of the last alignment guy, at least we will have an idea of where this sample of the "fleet" is before the 1 ton installation.
That is, unless all this discussion has caused all the owners to go out and reset their coaches to factory ride height, which would be a good thing.......
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
Visitors always welcome!
glwork@mac.com
http://jerrywork.com
541-592-5360
www.southernoregonguild.org
www.siskiyouguild.org
----------------------------Message: 10
Date: Sat, 10 Dec 2011 04:26:29 -0800 (PST)
From: Gary Casey <casey.gary@yahoo.com>
Subject: Re: [GMCnet] 1-Ton Installation
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Message-ID:
<1323519989.27306.YahooMailNeo@web125601.mail.ne1.yahoo.com>
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Someone asked if, after the discussion on ride height was "resolved," that a summary be written. ?I'm not sure it got completely resolved, but as I understand it, changing to the "1-ton" geometry WILL result in higher torsion bar load and hence a lower ride height. ?I think the load goes up by approximately 6 percent, resulting in the ride height lowering by a modest,but significant amount - I'm estimating between 1/4 and 1 inch. ?Some have reported an "unrecoverable" lowering of height but at least one said there was no change. ?For sure it doesn't ride higher after the change. ?And that's about as resolved as it got :-)
Gary Casey?
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] 1-Ton Installation [message #152408 is a reply to message #152398] |
Sat, 10 December 2011 12:24  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Jerry, yes we will be there a day or two early to make sure that we are set
up to do just that. As a tech seminar series, I hope to have a coach with
all the bells and whistles installed. That will be quadra bag, discs all
around, Algur Reaction arm, 1 ton front end and remote air bag controls
over the EL II Set up. Might, if I have time also have a laptop set up on a
fuel injection setup if possible. Should be a great Rally. Pray for
sunshine. With Manny and his wife there as hosts, there won't be any
concerns about food, either.
Jim Hupy, Tech VP GMCWS
Salem, OR
78 GMC Royale 403.
On Sat, Dec 10, 2011 at 8:48 AM, Work Jerry <glwork@mac.com> wrote:
> One additional "conclusion" I think worth mentioning. Not all of our
> coaches were going down the road at the specified factory ride height
> before the installation of the 1 ton front end. We know that rear ride
> height plays a significant role in determining front ride height. If the
> rear was low (most likely) or high to begin with and you reset it to
> factory spec (as you should) after the 1 ton front is installed, the amount
> your front will need to be raised will differ significantly from another
> coach even if the torsion bars on the two coaches have exactly the same
> strength. So, yes, there certainly does appear to be higher torsion bar
> loading with the wider spacing required to clear the larger rotors on the 1
> ton front end, but torsion bar loading and torsion bar age/strength are
> only one of several factors effecting resulting front ride height.
>
> I am going to ask Jim H. (tech VP for GMCWS) to allow me to set up an
> experiment at the upcoming GMCWS Casa de Fruta spring rally. As the
> coaches all come in I would like to quickly measure and record front and
> rear ride height. That will give us one touch point on how our coaches are
> now set going down the road. So, whether that distribution of ride heights
> is a result of torsion bars getting tired, owner aesthetic preference, or
> just the whim of the last alignment guy, at least we will have an idea of
> where this sample of the "fleet" is before the 1 ton installation.
>
> That is, unless all this discussion has caused all the owners to go out
> and reset their coaches to factory ride height, which would be a good
> thing.......
>
> Jerry
> Jerry Work
> The Dovetail Joint
> Fine furniture designed and hand crafted in the 1907 former Masonic Temple
> building in historic Kerby, OR
> Visitors always welcome!
> glwork@mac.com
> http://jerrywork.com
> 541-592-5360
>
> www.southernoregonguild.org
> www.siskiyouguild.org
> ----------------------------Message: 10
> Date: Sat, 10 Dec 2011 04:26:29 -0800 (PST)
> From: Gary Casey <casey.gary@yahoo.com>
> Subject: Re: [GMCnet] 1-Ton Installation
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Message-ID:
> <1323519989.27306.YahooMailNeo@web125601.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Someone asked if, after the discussion on ride height was "resolved," that
> a summary be written. ?I'm not sure it got completely resolved, but as I
> understand it, changing to the "1-ton" geometry WILL result in higher
> torsion bar load and hence a lower ride height. ?I think the load goes up
> by approximately 6 percent, resulting in the ride height lowering by a
> modest,but significant amount - I'm estimating between 1/4 and 1 inch.
> ?Some have reported an "unrecoverable" lowering of height but at least one
> said there was no change. ?For sure it doesn't ride higher after the
> change. ?And that's about as resolved as it got :-)
> Gary Casey?
> ---------------------------------
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] 1-Ton Installation [message #152460 is a reply to message #152398] |
Sat, 10 December 2011 19:34 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""I am going to ask Jim H. (tech VP for GMCWS) to allow me to set up an experiment at the upcoming GMCWS Casa de Fruta spring rally. As the coaches all come in I would like to quickly measure and record front and rear ride height. That will give us one touch point on how our coaches are now set going down the road. So, whether that distribution of ride heights is a result of torsion bars getting tired, owner aesthetic preference, or just the whim of the last alignment guy, at least we will have an idea of where this sample of the "fleet" is before the 1 ton installation.
That is, unless all this discussion has caused all the owners to go out and reset their coaches to factory ride height, which would be a good thing.......
""
Jerry I think that's a good idea. A while ago I helped John Ruff raise his first GMC and it was so low that once we raised it, it just didn't look right even though the numbers verified it was correct. Of course then the toe was way way off. I subsequently checked mine and it too is low. Even with the correct tool it is a bit disconcerting how much effort it takes to raise that sucker.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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