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Anyone else try the Air ride Front suspension ? [message #257335]

Thu, 31 July 2014 16:33

seven

Messages: 322
Registered: July 2008
Location: Calgary Canada

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Anyone else try the Air ride Front suspension ?

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=24325&rid=1484

Jay Fox Calgary AB
73 Painted Desert (Turtle)
78 Transmode (Trailer Donor)

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Re: Anyone else try the Air ride Front suspension ? [message #257350 is a reply to message #257335]

Thu, 31 July 2014 18:36

seven

Messages: 322
Registered: July 2008
Location: Calgary Canada

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Senior Member

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=192643&rid=1484#msg_192643

Jay Fox Calgary AB
73 Painted Desert (Turtle)
78 Transmode (Trailer Donor)

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Re: Anyone else try the Air ride Front suspension ? [message #257352 is a reply to message #257335]

Thu, 31 July 2014 18:45

bwevers

Messages: 597
Registered: October 2010
Location: San Jose

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That air ride design caught my interest. But if you look at the space available (in the photo), the diameter of the air cylinder looks about 3 inches.
How much air pressure does it take to lift a 2300 pound weight with a 3 inch air cylinder?
I think the weight to support is more than 2300 pounds if you look at the leverage that the shock absorber mounting bracket has.

If you use 120 PSI you might only get 850 pounds force.
And that weight is on the shock absorber mounting bolt.
And the torsion bar supports the rest of the weight.
Maybe it will raise and lower the coach an inch or two. Very Happy

Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose

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Re: Anyone else try the Air ride Front suspension ? [message #257363 is a reply to message #257335]

Thu, 31 July 2014 19:54

Bob de Kruyff

Messages: 4260
Registered: January 2004
Location: Chandler, AZ

Karma: 1

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seven wrote on Thu, 31 July 2014 15:33

Anyone else try the Air ride Front suspension ?

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=24325&rid=1484

My GM friend and I have a hydraulic concept that we need to prototype. I don't think air ride on the front will be accurate enough to always bring the coach to the correct driving height to ensure the correct toe and camber when in the "home" position. Our approach is to make the adjustments at the pork chop end.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: Anyone else try the Air ride Front suspension ? [message #257382 is a reply to message #257363]

Thu, 31 July 2014 22:32

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

Bob de Kruyff wrote on Thu, 31 July 2014 19:54

seven wrote on Thu, 31 July 2014 15:33
Anyone else try the Air ride Front suspension ?

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=24325&rid=1484

My GM friend and I have a hydraulic concept that we need to prototype. I don't think air ride on the front will be accurate enough to always bring the coach to the correct driving height to ensure the correct toe and camber when in the "home" position. Our approach is to make the adjustments at the pork chop end.

Accuracy isn't a problem, you can easily get a few thousandths of an inch resolution. Suspension Stiction and road noise are the hard parts.

But I do like the hydraulic motor on the pork chop end.
Just set it to a known position and leave it. No dynamic changes, ever.

Another idea is a worm drive that spins the socket on the frame end of the torsion bar. you just program in a known position and set it to that. It doesn't move with the suspension so theres no guessing.

I think the hard part would be the motor and mechanism to hold all that stress

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: [GMCnet] Anyone else try the Air ride Front suspension ? [message #257397 is a reply to message #257335]

Thu, 31 July 2014 23:32

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Jay,

Scroll to the very last message in that thread and you'll find:

Quote

Jim,

This was discussed on the GMCnet when you installed it and IIRC it was noted that it was a one off and Manny would not be building
any more.

Regards,
Rob M.

Unquote

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Jay Fox
Sent: Thursday, July 31, 2014 4:33 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Anyone else try the Air ride Front suspension ?

Anyone else try the Air ride Front suspension ?

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=24325&rid=1484
--
Jay Fox
Calgary AB

73 Painted Desert (Turtle)
73 23 Footer (Little One)
78 Transmode (Trailer Donor)

http://www.amra.ca/Club%20Hauler.htm

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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: Anyone else try the Air ride Front suspension ? [message #257407 is a reply to message #257363]

Fri, 01 August 2014 00:40

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

Bob,
Maybe you could try a horizontal stabilizer actuator from a Learjet or similar plane to adjust the pork chop position. A motorized, geared down compound jackscrew assembly, it definitely has the power you need for that load, and it doesn't leak down or require external plumbing and pumps. They are in the larger planes too, but those units might be too large for the space requirements.

I'm going to go the airshock route on my 73, as soon as I find or fab up some with ends that will take 9/16 bolts. Just wanna take some load off the old torsion bars and replace the shocks in one operation. Not looking to jack the front end up. Installing Onan, 200 Lb. battery, and 20 gallons of water raised the front almost another inch...

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: Anyone else try the Air ride Front suspension ? [message #257422 is a reply to message #257407]

Fri, 01 August 2014 08:07

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

Bullitthead wrote on Fri, 01 August 2014 00:40

Bob,
Maybe you could try a horizontal stabilizer actuator from a Learjet or similar plane to adjust the pork chop position. A motorized, geared down compound jackscrew assembly, it definitely has the power you need for that load, and it doesn't leak down or require external plumbing and pumps. They are in the larger planes too, but those units might be too large for the space requirements.

that cant be cheap Sad

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: Anyone else try the Air ride Front suspension ? [message #257502 is a reply to message #257422]

Fri, 01 August 2014 23:00

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

Yeah, it would involve an expensive GMC ride out to the airplane graveyard out in Arizona? Is that where it is? A long trip for me...

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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