OBA tank vs no tank: How long does it take to fill your tires?
- Thread starter jjvw
- Start date
OP
I had to copy and paste the URL into an incognito tab just to make sure JMT wasn't trolling here as well, he blocked me for a similar discussion where I told him to shut it about similar threads, there will be more so shut it.
OP
I haven’t seen real numbers and am curious. I also can flip a valve to remove the tank in my setup. So I might as well test it.
My guess is the tank saves 10 seconds.
OP
There is a claim that running a 2 gallon tank for your onboard air system shortens the fill time for the tires on a rig by 4 minutes. That needs to be figured out.
The basics are simple. Each time a compressor piston completes a stroke, it produces a very specific volume of air. That can not be disputed. However many strokes it takes to inflate a tire from a given PSI to another given PSI takes X number. Whether those strokes go into temporary storage or into a tire does not and can not change that number.
The amount of time saved by running a temporary storage tank is exactly the amount of time that it takes for the compressor to turn on after you start inflating the tire. There is no 2 gallon air tank on the planet that holds 1 minute of inflation time into a tire that can be filled with an onboard air system at sub 200 psi. It just doesn't work that way.
My guess is 5 seconds per tire if you discount the original fill time of the tank.
OP
Nope. High side pressure changes the volume that leaves the chamber.
Edit: overall I agree with post #11 so it don't matter either way for what it's worth
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Something is not correct. A piston stroke does not give a specific amount of air (CFM?) on any air compressor, it varies considerably according to psi it is up against. The viair units I am currently using put out 3.53cfm@0psi and choke to 1.90cfm@100psi and down to 0.85@200psi
The lower end of a tire fill is faster due to less resistance via PSI. As a tire reaches it's desired PSI, the rate of fill is slower. That is why the stored air is used in pneumatic solutions. Not many run tankless. It is not efficient. I realize our OBA systems hardly qualify for an engineer, but it still falls under the laws of pneumatics.
OP