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Tested the set-up with a Schrader valve instead of the quick disconnect air coupler and it effectively doubled the time from 20 to 30 psi. It took 2 minutes and there is a substantial pressure drop across the valve, about 40 psi. Perhaps for smaller tires, it doesn't matter so much, but when a...

Preliminary observations make me believe that the Schrader valve reduces flow and that's why two tires can be filled as fast as one from a splitter that doesn't include this valve in the feed line. That's the whole idea.... I'll experiment some more and post any new results. Edit: Using "shop...

Wayne, notice the difference, no Schrader valve on the feed to the splitter. The compressor can only put out so much air and if there are too many tires hooked up at the same time, there is no time saving and it's just as easy to hook up a pair at a time. I'll get the numbers to show what I...

For this experiment, from Walmart of all places..

Gerhard, the limiting factor is the compressor output (about 7 cfm). Haven't done the math yet, but I'm pretty sure that there would be no time saving in having all eight hooked up, two yes, but not eight. The tire valve (Schrader valve) limits the air flow, so for the compressor there is...

Using extra parts from around the basement, put this together. It effectively cuts time in half airing up two tires at a time....