Geocritter wrote:
Thomas/NH wrote:
Geocritter wrote:
I’ll be frank, I’m mathematically challenged. Don’t get me wrong, I can read a formula and plunk numbers into a calculator I just don’t “think” mathematically. So my question is how many cubic feet of air does one of my 235/85R16 tires hold when empty and when filled to 70psi?
Steve
I'm mathematically challenged as well, but I can help you with the answer you're looking for...
I'm a HVAC contractor and use nitrogen all the time. I get it in 100 cubic ft, cylinders (6"round X 24"high 3600PSI) I can fill all four of my 16" trailer tires from dead flat to 65# PSI with one tank. The tank costs me $10 (I had to buy the first tank then just exchange it for a full one), my two-stage step-down regulator costs about $60 and the inflator hose &connectors was another $20.
I know the word "Nitrogen" causes all sorts of controversy, but it sure works well for me. The pressure is always stable in the tires and eliminates the squiring effect of cold tires in the morning. Hope this helps you.
That 100cu ft cylinder you use sounds great! Where did you get it? What did the original cylinder cost? I inquired at the local welding supply store and they have 55 and 80cu ft cylinders filled to only 2,000psi. I've already purchased a two-stage step-down regulator at Harbor Freight (only the best for me) and I'll be using the hose and connections from a fairly large air compressor I have in storage.
You got me on that one... After reading your note, I charged out to the shop for a closer inspection of the cylinders (this time in the light and my glasses on). Not much discernible on the tank, just code numbers. Back to house, to check out my SCUBA cylinders, I know they are 100 cu ft. and physical measurement are bigger all around. So, you're right, it is a 80cu ft. and if that's so 2K PSI is right.
Sorry about that... I think I paid about $80 for the first tank.
