Dave, Jerry,
I'm not sure if there is a clear answer on where our max pressure is supposed to be set on these Magnum and Roadmaster C12 chassis. Dave, the values you state by compressor I'm sure are correct for the compressor. It would seem that most posts for these coaches have been around the 110 to 115lb range for cut out. I just do not know if we were set up in that range for a reason. I think going higher pressure will not be an issue but cycling will be about the same because I think cut in and cut out values move together with the adjustment. For now I am going to leave well enough alone and maybe Gerald will chime in on this.
Jerry, going to zero overnight for your green needle is more air loss then expected, my leak down rate is less than that.
As far as air use based on my understanding of these suspensions, when the coach goes high like with a bump the valves let air out, when it comes down lower then it is set for, the valves let air in so there is constant use of air with varying road conditions by the three leveling valves. This is true for the coach leaning due to wind or road tilt also. So you may have the on pressure at 100 and the off at 110psi and are cycling between those two values often. My older Beaver coach on a Gillig chassis used less air but they used what was known as slow acting valves which metered air with some delay or flow reduction before making a height adjustment. I think Magnum and Roadmaster use fast acting valves now that constantly compensate to stabilize the coach which consumes a larger volume of air but the ride is more stable. My cycling between the cut in and cut off pressure typically cycles between 20 seconds and a minute and a half depending on road and wind conditions while driving.
Later Ed
