Originally Posted by framanda
3/8 is plenty big. Most all automotive mechanics shops run 3/8 air hose. The only place I have seen 1/2 air hose was in heavy equipment shops running huge impact guns
I am just relaying my experience. The 3/8" line restricted the volume of air to the point that a tire inflator could exceed the air handling capability of the integrated lines. Forget using an air impact. It would get two impacts then get starved for air.
I realize your fittings have smaller openings and orifices than a 1/2" hose. I understand that the hose you plug in is only 3/8". I am not a physics professor. I have no idea why it didn't work. All I know is it didn't.
Especially the lines from the compressor to the tank. If you're charging the tank while driving, let me know how your hearing is afterwards. I made that mistake. The high pitched SCREAM of the air being forced through that tiny (in comparison) air hose is deafening. The 3/8" line would actually restrict the air flow to the point that the pressure switch would chatter on and off.
I moved my pressure switch to the tank end of the line. Bad idea. I had two pressure gauges on my system. One in the dash that read at the output of the compressor, the other on the tank itself. Once I moved the pressure switch to the tank I broke my 150PSI gauge that was at the output of the compressor. Burst the internals. I estimate from the damage to the gauge I spiked the pressure to somewhere around 300PSI as immediately after the gauge blew up I burst a 250PSI line that ran right under my arse (I ran the line to the tank along the "frame rail" on my XJ.
That was a short trip as I had to turn around and go change my shorts.
That Sanden compressor could fill my twin 5 gallon tanks from dead empty to 120PSI in less than 30 seconds if I picked the engine off idle at all. If I was driving and could handle the scream, it would fill them up in around 10 seconds. Most people have absolutely no idea just how much air that compressor will move. There is no electrically powered compressor that can even come close. Electrical compressors are equivalent to kids tricycle. These A/C compressors are a drag race motorcycle. There's that much difference. I think the best Campbell Hausfield can do on a 45 gallon twin cylinder 220V compressor is about 12 or 15 CFM. I do believe the R134a Sanden compressor is quite capable of forcing out something like 100 CFM. And at MUCH higher pressures. Think about it - R134a standard high side pressures vary between 275 and 400 PSI.