Home » Public Forums » GMCnet » Rear bogie arrangement question
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| Re: [GMCnet] Rear bogie arrangement question [message #115390 is a reply to message #115379] |
Thu, 17 February 2011 17:22   |
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gordh1
Messages: 332
Registered: February 2011
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Many thanks Rob - wish I had a book!
I've been reading a lot about the airbags, the issues and mods to try to
keep the 'swingarms' in line, the brake torque mods to keep the rearmost
wheels on the ground, and was pondering that first, wouldn't it be better if
*all* the rear arms were trailing, all used their own independent suspension
be it air or spring (preference for the latter). I'm a 'motorcycle guy' by
background so some of these things just seem to take the short trip across
my mind from time to time quite naturally. :-)) I'd be up for trying 4
trailing and maybe space permitting, 4 coil-over setups with hydraulic
preload / ride height adjustment (maybe interconnected per side?), and maybe
something to dramatically improve the pivot bushings along the way.
In short, what I seem to read are a lot of (I guess, "tolerable") fixes to
symptoms, but no cures to what might I feel is an inherent design problem -
well, somewhat typical to GM, compromises due to cost.
Some nifty reading and pics as to where my mindset comes from for anyone
interested, just on a 'lighter' scale:
http://www.altairhyperworks.co.uk/html/en-GB/session4/diPiazza_ducati.pdf
Thanks again Rob,
Gord
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rob Mueller
Sent: Thursday, February 17, 2011 5:36 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Rear bogie arrangement question
Gord,
Ref: Parts Book 78Z Page 14-3 Key 11 & 23
The RH front and LH rear are the same.
The LH front and RH rear are the same.
The original design of the suspension system was a "hydraulic/pneumatic"
system ala Citroen. According to what I've read GMC dropped it because of
cost.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428 USA '75 Avion - Double Trouble
TZE365V100426
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| Re: [GMCnet] Rear bogie arrangement question [message #115394 is a reply to message #115390] |
Thu, 17 February 2011 17:47 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
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Gord,
No question that cost pressures are a big factor in how things get designed and everything can be improved. But, things like packaging (using less room for suspension parts and more room for interior furnishings) ride aspects, and the much loved easy height control also enter into it.
I'm not a suspension designer, but I think if you reverse the front "leading" arms to make them trailing, you'll want to put springs somewhere around where my hot water heater and electrical closet are.
From a ride standpoint, imagine driving over a 4x4 laying on the ground. The leading wheel has to take a heck of a shock, but as it comes back to the ground, it lessens the pressure on the trailing wheel, making it easier to climb the 4x4. So, the semi-independence of the single air bag does provide some advantages.
You could use air shocks I suppose to gain back some auto and campground leveling ability if you went to steel springs, but most of them have very limited capabilities compared to a GMC.
Just a few things to think about.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Rear bogie arrangement question [message #115398 is a reply to message #115390] |
Thu, 17 February 2011 18:07 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Gord,
Agreed! Four trailing arms would be MUCH better especially for braking! When
you hit the brakes the rear end would squat rather than raise.
The OEM configuration results in the bogie arm uprights and air bag(s)
pushing against each other. In a four trailing arm setup you would have to
build uprights that the airbags would push against. They would have to
support 1/4 of the rear weight and any "shock" loads experienced when
hitting bumps, pot holes, etc. Obviously it could be done but I think they
would be pretty big, heavy and eat into the interior space.
Here's some numbers to consider:
26' GMC GVWR = 11,700 lbs (this was upped to 12,500 but I can't find the
reference and the front / rear split.
GAWR (Gross Axle Weight Rating) = 7,500 lbs Rear Wheels
7,500 / 4 = 1875 lbs per wheel
The 1875 lbs would be increased by the length of the uprights.
This is in the too hard basket for me! ;-)
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Gordon R. Hubbell
Sent: Friday, February 18, 2011 10:22 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Rear bogie arrangement question
Many thanks Rob - wish I had a book!
I've been reading a lot about the airbags, the issues and mods to try to
keep the 'swingarms' in line, the brake torque mods to keep the rearmost
wheels on the ground, and was pondering that first, wouldn't it be better if
*all* the rear arms were trailing, all used their own independent suspension
be it air or spring (preference for the latter). I'm a 'motorcycle guy' by
background so some of these things just seem to take the short trip across
my mind from time to time quite naturally. :-)) I'd be up for trying 4
trailing and maybe space permitting, 4 coil-over setups with hydraulic
preload / ride height adjustment (maybe interconnected per side?), and maybe
something to dramatically improve the pivot bushings along the way.
In short, what I seem to read are a lot of (I guess, "tolerable") fixes to
symptoms, but no cures to what might I feel is an inherent design problem -
well, somewhat typical to GM, compromises due to cost.
Some nifty reading and pics as to where my mindset comes from for anyone
interested, just on a 'lighter' scale:
http://www.altairhyperworks.co.uk/html/en-GB/session4/diPiazza_ducati.pdf
Thanks again Rob,
Gord
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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: Rear bogie arrangement question [message #115404 is a reply to message #115377] |
Thu, 17 February 2011 18:26 |
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Hardie Johnson
Messages: 483
Registered: January 2004
Location: Raleigh NC
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| gordh1 wrote on Thu, 17 February 2011 17:11 |
<>Has anyone rather than battling with various airbags ever considered spring(s) with hydraulic preload / ride height adjustment?
Gord
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Yes, springs have been done but probably not with hydraulics. The GMCMHPhoto site has a collection of photos of variations.
Don't undervalue the stock GMC suspension. The walking beam setup has a great advantage of absorbing a bump by spreading it out over time, resulting in less jolt. (technical term for rate of change of acceleration.)
The development of new approaches for the rear suspension comes from loss of a reasonable air bag replacement coupled with the desire for better brakes. Anti roll bars and track guides have been used on many coaches with subjective praise from owners. We don't do timed slalom runs, so no one really knows, it just 'feels better.' Mechanically, the true track tolerances for being sure it can run up and down are similar to the objectionable deflection that it avoids. Maybe.
I think my stock coach handles fine, but when my next brake job comes, or both air bags are gone, I'm going to the "Jimmy" rear suspension.
"both Jims"
Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC
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| Re: Rear bogie arrangement question [message #115417 is a reply to message #115377] |
Thu, 17 February 2011 19:28 |
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gordh1
Messages: 332
Registered: February 2011
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Thanks Craig,
I'm just not getting it with the 4x4 visual (sorry...my brain) 8~P. Oooh I'd love to see a slow speed video of that actually happening at some realistic road speed. To me I (think I) see the forward wheel climbing the 4x4, compressing the somewhat common airbag, pushing down and increasing the pressure on the rearmost wheel for the upcoming impact. ? The rear wheel then taking an even harder hit (unless of course the front wheel has had enough time to make it back to the ground) and the air pressure reduced - or did the initial forward wheel impact blow-off the pressure?
I'm still looking to start with a clean slate so I guess I'm not considering existing interior arrangements too much and would give them some thought, but build around -whatever- if the gains seemed worth it.
Rob, Cheers - many thanks for the numbers! I don't suppose you have any suspension travel numbers in that book of yours?
Hardie, thanks very much! No undervaluing at all - I just like to 'bounce' (pun) ideas around in my head and after all, dreaming is free. It actually seems the GMC Motorhome is not a true walking beam setup and as I wasn't familiar with the term, I Googled it and it referred me to a forum ( http://www.thetruckersreport.com/truckingindustryforum/questions-to-truckers-from-general-public/61548-walking-beam-suspension.html )where a reply was "The walking beam suspension is often called the Hendrickson suspension" (and the general comments were far from complimentary), so I looked up Hendrikson and found a newly developed product they have, and curiously enough... 4 trailing arms, with airbags!
http://www.hendrickson-intl.com/about/trailer_suspension.asp
Depending on the space available, a hydraulic spring preload adjuster along with a properly rated spring could probably provide quite significant adjustment in height possibly exceeding any airbag - imagine for a moment the travel available on a multi-stage hydraulic cylinder? Think of those biggggg dump trucks lifting their buckets (only on a smaller scale)?
Suspension and handling are really important to me and that's in no part thanks to where I live - Quebec has about the worst roads on the planet (it's the weather that does it) so the smallest issue is multiplied terribly, but I guess more that I'm just inquisitive and always enjoy looking for a better way…if there is one.
Thanks again gents!
Gord
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| Re: [GMCnet] Rear bogie arrangement question [message #115435 is a reply to message #115429] |
Thu, 17 February 2011 21:29 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Rob, just replace the bogie pin with a torsion bar anchored on the other
side of the coach and the bogie arm, dampen jounce & rebound with a heavy
duty coilover air bag totally independent of the rear one and have true
independent 6 wheel torsion bar suspension. Could easily be done, just
expensive but it is only money.
Jim Hupy
Salem, Or
78 GMC Royale 403 (convinced that quadra bag rear suspension is a bona fide
replacement for the stock single air bag system.)
On Thu, Feb 17, 2011 at 7:17 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Gord,
>
> Unfortunately I don't, however, the rear suspension travel is controlled by
> the shocks. If you take one off your GMC and measure it extended and then
> compress it you will know how far the bogie arm can travel at the shock
> mounting point. You can use that to calculate the distance the axle moves.
>
> Thanks for the Hendrickson link, I never thought of configuring the system
> horizontally! The ones they sell are serious overkill but the design
> concept
> might work on a GMC.
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Rear bogie arrangement question [message #115446 is a reply to message #115435] |
Thu, 17 February 2011 22:15 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Gord,
Sorry for the shaky description, but your last part, where the front (intermediate) wheel is coming down before rear wheel starts up, is where at least the 2nd jounce is diminished quite a bit. I had the same hard time understanding the description of the Hendrickson suspension from the trucker site, but one distinction is that GMC's are essentially never empty. Round #'s, a GMC goes from 10,000 lbs. "empty" to 12,000 lbs. "laden" A semi goes from maybe 30,000 lbs. empty (a guess, but depends on what kind of trailer) to 80,000 laden, so a much broader range of spring travel and ride rates are involved.
A look at that 4 trailing link truck suspension shows some of the packaging issues, though. Their version is packing the springs and suspension links beneath the frame and the resultant frame height is probably around 30" versus maybe 8 or 9 for the GMC. You could package the springs/shocks vertically along side the frame rather than underneath. There isn't a great deal of space between the tire and frame unless you increased the track, and they would still stick into the interior space, and there are 2x as many of them to deal with. Or, you could go Rob's way and package them horizontally as today, but would still need both height and longitudinal width to have room for the front ones. If you want to add a hydraulic height adjuster on top of the spring, it's even more challenging. But, if you are open to serious frame and interior modifications anything is possible with time and money.
I unfortunately haven't driven my coach that much, but I can't believe the Detroit area roads are any better Quebec's (been 25 years or so since I ski'ed at Mt. Tremblant, but the roads were great back then!) So, maybe my expectations are too low, but considering I've never done any serious front or rear suspension work on my old coach, it seems to drive pretty well. Would even be better if I had learned from this site about Michelin rib tires before I bought them instead of after! Like everything, it comes down to priorities and and budgets, and everyone values those differently.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Rear bogie arrangement question [message #115453 is a reply to message #115390] |
Fri, 18 February 2011 00:30 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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First thing I did when I purchased the coach in1980 was to order the
pars book and the service manuals.
It can sure help answer lot of questions and save time.
There are lot of short cuts compared to the manual, but it is still
the best there is.
On Thu, Feb 17, 2011 at 3:22 PM, Gordon R. Hubbell
<g.r.hubbell@gmail.com> wrote:
> Many thanks Rob - wish I had a book!
> I've been reading a lot about the airbags, the issues and mods to try to
> keep the 'swingarms' in line, the brake torque mods to keep the rearmost
> wheels on the ground, and was pondering that first, wouldn't it be better if
> *all* the rear arms were trailing, all used their own independent suspension
> be it air or spring (preference for the latter). I'm a 'motorcycle guy' by
> background so some of these things just seem to take the short trip across
> my mind from time to time quite naturally. :-)) I'd be up for trying 4
> trailing and maybe space permitting, 4 coil-over setups with hydraulic
> preload / ride height adjustment (maybe interconnected per side?), and maybe
> something to dramatically improve the pivot bushings along the way.
>
> In short, what I seem to read are a lot of (I guess, "tolerable") fixes to
> symptoms, but no cures to what might I feel is an inherent design problem -
> well, somewhat typical to GM, compromises due to cost.
>
> Some nifty reading and pics as to where my mindset comes from for anyone
> interested, just on a 'lighter' scale:
> http://www.altairhyperworks.co.uk/html/en-GB/session4/diPiazza_ducati.pdf
>
> Thanks again Rob,
>
> Gord
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rob Mueller
> Sent: Thursday, February 17, 2011 5:36 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Rear bogie arrangement question
>
> Gord,
>
> Ref: Parts Book 78Z Page 14-3 Key 11 & 23
>
> The RH front and LH rear are the same.
>
> The LH front and RH rear are the same.
>
> The original design of the suspension system was a "hydraulic/pneumatic"
> system ala Citroen. According to what I've read GMC dropped it because of
> cost.
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428 USA '75 Avion - Double Trouble
> TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Rear bogie arrangement question [message #115470 is a reply to message #115429] |
Fri, 18 February 2011 07:58 |
Surbo
Messages: 213
Registered: February 2004
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| Robert Mueller wrote on Thu, 17 February 2011 21:17 |
Gord,
Unfortunately I don't, however, the rear suspension travel is controlled by
the shocks. If you take one off your GMC and measure it extended and then
compress it you will know how far the bogie arm can travel at the shock
mounting point. You can use that to calculate the distance the axle moves.
Thanks for the Hendrickson link, I never thought of configuring the system
horizontally! The ones they sell are serious overkill but the design concept
might work on a GMC.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Rob & all;
Dallas-Smith has a more workable assembly, complete with brakes, camber adjustment, air bags, etc. Take a look here;
http://www.axleless.com/products-singlemodules.html
Bob Drewes in SESD
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| Re: [GMCnet] Rear bogie arrangement question [message #115472 is a reply to message #115470] |
Fri, 18 February 2011 08:16 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Bob,
Interesting. I couldn't get their pdf downloads to work, so a little hard to see clearly. It looks like they are basically packaging springs and shocks where the inner wheel of a former dually setup would have been. (but I may not be looking at the pictures right). You would have to create that space on the interior of our coaches, and more importantly, narrow the frame to allow for the suspension movement. And, once the frame is narrowed, figure out how to put torsional rigidity back into it. Not impossible, but not easy.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Rear bogie arrangement question [message #115476 is a reply to message #115470] |
Fri, 18 February 2011 08:33 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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Interesting.
It looks like you could get away with a "Super Single," making a four wheeled GMC. THAT could save on those highway and bridge tolls!
I suspect it would be expensive for "one-off" uses. (They most likely want to sell to manufacturers... not users.) But if you are in need of a boggie rebuild AND this could give you the braking of the reaction arm... it might not be totally out of bounds.
Need more info... measurements, weight, tire sizes, cost and ect. I couldn't get the PDF to work either. I'll try when I get home from work.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Rear bogie arrangement question [message #115578 is a reply to message #115446] |
Fri, 18 February 2011 18:16 |
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gordh1
Messages: 332
Registered: February 2011
Karma: 0
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Hi Craig - and thanks.
Laden, and speaking strictly laden, I still see the second wheel hitting that 4x4 with equal if not more resistance to movement assuming the airbag is common as the airbag pressure must have increased from the compression by the forward wheel? Ok, let's say the forward wheel has made it back to the ground and the airbag pressure is back to what it was to start before the second wheel has to rise... I'm puzzled.
I certainly see packaging issues with almost anything - the single axle setup Bob (hi & thanks Bob), found seems very clever by design...I couldn't do it though as I find part of the magic of the GMC is the look of the two rear wheels - makes it so special and unique. 
Montreal and the surrounding area is suffering badly right now - has been for oh, 5 or so years. The infrastructure is crumbling as a lot of it was built in the 60's I guess, and its time has come. Yikes - a few years back an overpass just decided to give out and did in some motorists sitting in cars underneath, and now the entire elevated expressway system in Montreal is about to be rebuilt (they got the message and went to inspect everything), and that to the tune of *billions*. The city is growing outward at a phenominal rate - more people of course equals a lot more traffic and abuse to the roadways.
Highway 15 which runs north up towards Mont Tremblant dropped an overpass too - that during construction! That construction company is no more - sued and fined in to non-existence. It's actually one of the tolerable highways - just don't be surprised if in a traffic jam, the car in front of you won't wait under an overpass for traffic to move. These 'issues' have certainly spooked a lot of Quebecers. No worries really though. I haven't heard of any overpass issue since...-umm....a couple of days ago.  http://www.montrealgazette.com/news/Concrete+slab+falls+overpass/4283604/story.html
On the bright side, there are still some phenominal roads with beautiful scenery, and they certainly are working on things - I haven't been up that way in many years as well, but if you could find the right moment to dodge the construction traffic jams (or just avoid Montreal and the immediate surroundings), Mont Tremblant has been turned in to a gorgeous place to visit. Some investors got in there some time ago and made the place true world-class. Take that as you may, nice spot any time of year now and worth the drive be it bumpy or not.
http://www.tremblant.ca/village/index-e.htm
For those not in tune, I'm not a GMC Motorhome owner *yet*. I'm looking very hard all over the US and Canada trying to find one that is basically ok but will need some work. To me, it is truly at least half if not more than half, the fun to tinker with it to make it something nifty, probably use it next fall/winter if things went well. I like the size, the look...pretty much everything about them - (to me there is no other option!) and it's just fantastic to meet such a helpful and inviting group here. If things go well, I'll have one within a month and hopefully it'll come with a book. Then...the fun begins!
Thanks Gents!
Gord
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| Re: Rear bogie arrangement question [message #115589 is a reply to message #115377] |
Fri, 18 February 2011 19:39 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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I think that there isn't a GMC alive that doesn't have some little project that the owner would like to do (or have done). That certainly is half the fun for me, and this list does make it a whole lot easier to get information. Thank God for the internet and helpful people!
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: Rear bogie arrangement question [message #115607 is a reply to message #115589] |
Fri, 18 February 2011 20:30 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
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Gord,
Sorry to hear about your roads, maybe they are worse than Detroit. The only time we've had major interstate bridges fall in the area was when gas tanker trucks crashed and flambe'd them. (Twice in the last few years - - who woulda thought!)
Can't believe the pictures of Tremblant! I think it was only 2 or 3 buildings when I was last there - wow! The view of the river from the top of the ski run was just amazingly beautiful then, and I am sure still is. Someday I'd really like to take a driver's school at Le Circuit Mt. Tremblant, but not sure if I'll ever make it there for it.
Let me remind you again, that I barely know enough about vehicle dynamics to hurt myself, and by trade was (am?) a marketing guy and not an engineer. But, after the 1st wheel rises and returns to the ground, it has raised the rear of the coach a bit and lowered the pressure slightly in the airbag which is what makes the 2nd wheel easier to go over the 4x4. The coach stays up for just an instant due to inertia, the restraint of the shocks, and the vast difference in weight between the mass of the coach and the unsprung weight of the leading wheel and suspension, which is slammed back to the ground essentially instantly. Yet again a long description that a 15 second video would do a much better job of. I vaguely think I may have seen a sniglet of this in one of the original promo video's but I'll never find it.
Hope that helps. Good luck in finding a coach. I've had one about 4 years, and just about have enough stuff done to make it safe and comfortable to drive, but a long way away from prettied up and fully reliable. I went the cheaper more work approach, partially due to time and money constraints, and partially because there is a saying here, that if you didn't do the work, it never happened. But, GMC prices are probably 1/2 what they are when I got mine, and you can get some pretty nice ones either just about done,or at least with many of the upgrades already done for pretty cheap money. I know it didn't take long to more than double the cost of my coach just by putting Alcoa wheels, new tires, and new Kanamoto exhaust and headers on it. But, like you, I enjoy the working on it almost as much as using it, and once you get one, they are pretty addictive. A hazard to both your time and budget, but still way cheaper than a couple of divorces!
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: Rear bogie arrangement question [message #115612 is a reply to message #115607] |
Fri, 18 February 2011 21:05 |
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gordh1
Messages: 332
Registered: February 2011
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Hi Craig,
That's very much how I remember it too - just a little place with a little village. Now it's certainly pretty - nice in some ways, sort of sad in others to see pristine wilderness buldozed. At least (imho) they did a nice job and it's really improved the economy in that area.
Le Circuit Mont Tremblant - I'm not sure which schools still run there, but I know it was bought lock, stock and barrel, by Lawrence Stroll (Google that fellow - yeesh!) and as it's now his 'personal' circuit, last I heard there were a lot of restrictions as to who gets to go and play there. I have a friend who was in a race there and Stroll had put his McLaren F1 in to a gravel trap, and simply had the race red-flagged so nobody could scratch it. <dazed> Play in my sandbox, play by my rules. (Must be nice). 
Well, when I do find a suitable coach, I'll be sure to find a video camera and ask someone to film along side. The trip down my street...not 4x4s but perhaps more like 2x4s so that should give us some fun insight. Yup - a 'minter' doesn't interest me be that for good or bad. I really look forward to the game.
Thanks again Craig!
Gord
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| Re: Rear bogie arrangement question [message #115775 is a reply to message #115417] |
Sun, 20 February 2011 00:41 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Senior Member |
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Gord,
A way improve the ride of a single bag sys, is to add a tank of equal volume to each side, with large hose between bag and tank.
The purpose of the tank is to reduce the pressure spikes occurred upon bag compression. The wheel could travel further before inducing movement on the coach. The tanks could fit in front of the holding tank, but how to connect with 1/2 or 5/8 air hose reliably would be the challenge.
I've seen it done on custom vehicles with air suspensions.
Just something to think about.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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