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  #73  
Old 10-08-2010, 01:47 PM
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Re: Quadra Lift

Quote:
Originally Posted by parker View Post
I'd like to see a photo of the actual part or a cut away. This is a large misconception with air-ride systems. They use the term "air spring" because the air bag actually "is" the spring. The bags are heavier than the term air "bag" would lead you to believe. They are made similar to a tire with nylon or other type weave molded in to them. Ususlly they are around 1/8" thick if you cut one open.

to be honest...I deleted my post becasue I was not 100% sure. I thought I remembered seeing a pic of the air springs with the airbag on the inside of the spring.....bu then the second pic I posted from wk2jeeps doesnt show that. So Im not completely sure...sorry. The 2nd pic I posted seems to look like the airbag is covering a spring?

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  #74  
Old 10-08-2010, 01:50 PM
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Re: Quadra Lift

Like you Scott, I'm not 100% certain. This is the way all of the air systems I've seen work. The wrinkles at the top of the front bags in the picture may be how the bag is mounted to it's upper steel mount, a simple wrinkle in the bags or a partial spring in case of deflation or bottoming out.

Maybe someone who has taken delivery or someone who works on the assembly line could give us more insight.
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Old 10-08-2010, 02:02 PM
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Re: Quadra Lift

Then this:


is not used?
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  #76  
Old 10-08-2010, 02:04 PM
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Re: Quadra Lift

Quote:
Originally Posted by JoeSchmoe007 View Post
Then this:


is not used?
You are 1oo% correct sir!
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  #77  
Old 10-08-2010, 05:39 PM
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Re: Quadra Lift

My motorhome with air bags, and commercial trucks, use a dryer to keep moisture from condensing when the air is compressed (and the dryer needs to be replaced every few years as the beads get used up). There are also valves that spit out any moisture that does form. Without the dryer and the moisture release valves, the air systems in commercial trucks and Motorhomes would fail quickly. I hope the system in the jeep is truly a closed system, otherwise we are going to have moisture related failures.....
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  #78  
Old 10-10-2010, 03:12 PM
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Re: Quadra Lift

rdalcanto, i am very familiar with heavy truck and motorhome air suspension. I owned, operated, and mechanically repaired a fleet of 5 trucks for 18 years while I was an earthmoving and pipeline contractor. I now own a 40 ft. diesel pusher motorhome and the systems are identical.

When I started in the early to mid 80's air dryers and air dryers with ejector valves were the oddity. They were available but not often seen. Trucks from this era and before did very well without them. The main reason that they came into such popularity during the 90's and beyond was for trucks operating in the north locally and 48 state rigs seeing alot of northern miles.No moisture in the lines meant no water to freeze, causing brakes to stick or not function since the brakes on these units use the same air supply as the suspension. Failures on these early air systems were not common and the air dryer not a must have. When ordering a large truck every component is spec'ed. This means even down to the name brand of brake drum. Air dryers are an option, motorhome builders spec their chassis from Freightliner, Spartan, or build in-house, they spec the air dryer due to the fact that most non commercial drivers and motorhome owners wouldn't understand the daily need for draining the reserve tanks. This is especially crucial in cold climate, the dryer makes it close to a no touch system and helps aleviate liability.

Next, a commercial type vehicle, class 8 truck or motorhome chassis uses a large compressor mounted on and driven by the engine. The CFM and shear volume moved by one of these is astronomical in comparison to the qaudra-lift system. Also the commercial systems exhaust air to atmosphere when lowering and replace with fresh compressed air when filling to lift. The jeep system is supposed to be recycling a set amount of air to and from reserve tanks. This should build less heat and provide less chance for condensation.

Water will have little effect on the system, as I said older trucks didn't have this dryer and gave no problem other than in freezing temps. Although there were and are drains on the air reserve tanks for draining collected water. If the drains were checked regularly then freezing weather had little to no effect without a dryer. since the air isn't being compressed from the atmosphere then there will be little if any heat and or friction from compression to create condensation due to temperature variation.
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Old 10-10-2010, 10:24 PM
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Re: Quadra Lift

Thought I would add to Scott's suspension overview and add several pics of both Quadra Lift "air bags" versus standard "springs".

Attached Images
File Type: jpg Rear:Air.jpg (531.9 KB, 76 views)
File Type: jpg Rear:Spring.jpg (561.2 KB, 66 views)
File Type: jpg Front:Air.jpg (570.3 KB, 69 views)
File Type: jpg Front:Spring.jpg (527.0 KB, 65 views)
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  #80  
Old 10-10-2010, 10:25 PM
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Re: Quadra Lift

I hope you are right Parker. Truckers knew to drain their air reserve tanks. Even though my motorhome has the dryer, I still pull all three lanyards several times a year to check for moisture in my airbrake's tanks (manual requires you do so). I doubt soccer mom's would do it regularly even if it existed in the Jeep system (which it doesn't). I'm wondering if moisture in open systems is why Range Rover's air systems would fail so frequently. I too ordered QL, and pray that it will be reliable with their new "closed system," since many of us will be using the Jeeps in sub-freezing temperatures.
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Old 10-10-2010, 10:34 PM
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Re: Quadra Lift

cool pics!
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  #82  
Old 10-11-2010, 08:22 AM
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Re: Quadra Lift

Thanks for the pics dmcjjeep. The rear are definetly standard style air bags/ air springs. I still can't define whether the front are that type and just collapsed in the pic or whether it's a hybrid.
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  #83  
Old 10-11-2010, 03:26 PM
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Re: Quadra Lift

So what does "closed system" mean exactly (not just on WK2)? That air is pumped in and then it is "welded shut" forever and never needs replenishing? I just find it hard to believe - doesn't air always find a way out, sooner or later?
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  #84  
Old 10-11-2010, 03:49 PM
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Re: Quadra Lift

its a pressurized system where the air is pumped back and forth from the air springs to the tank. I'm sure there is a way to relieve the pressure to service etc.
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