| [GMCnet] Replacing air bag system [message #248111] |
Mon, 21 April 2014 20:25  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Hi Kerry,
This one has been discussed a number of times before. Turns out there is enough hysteresis in the rear suspension that air pressure does represent a very close analog for ride height. It won't be perfect in all cases, but it will be spot on for the majority of cases. When we purchased the Royale more than a decade ago one air pump was bad so I ran with Schrader valves in the ends of the bags "until I got around to fixing it" Years later I never had and never found the need. I could determine quite quickly what pressure resulted in my coach being at correct ride height going down the road. From a full fuel load to an empty one, from a full water load to an empty tank, from full to empty holding tanks the ride height at a given pressure in the bags changed very little, less than the slop in the factory ride height mechanism (factory spec is +- 3/8" if the ride height mechanism is working perfectly). Interesting that the factory ride height spec is +- 1/4" so it was alway
s curious to me how one was supposed to stay within that ride height when it was being controlled by a gizmo with an even greater tolerance. But, that is how it is/was. As an experiment, measure your ride height and then have four people stand on the back bumper and measure it again and see how little difference there is.
Anyway, when I first heard about the wireless air system I jumped on it just to keep my head and body away from the bag as I blew it up or let it down to level. I always felt a bit uneasy being so close to a decades old air bag with close to 100 pounds of air in it. Since I installed the wireless air controller (I put on bag extenders to lower the op pressure to 75psi for my coach going down the road) I find it very convenient and ride height very stable and predictable. I have a stock system on the Clasco and can't find a nickles worth of difference between them in real world use.
Hope this helps.
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
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Message: 1
Date: Mon, 21 Apr 2014 14:17:47 -0500
From: Kerry Pinkerton <Pinkertonk@MCHSI.com>
Subject: Re: [GMCnet] C
To: gmclist@temp.gmcnet.org
Message-ID: <3c90d.53556edb@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
Perhaps I'm missing something but how does the wireless system know what the correct height is? Bag pressure is not the same thing as ride height.
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
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Jerry & Sharon Work
78 Royale
Kerby, OR
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