0 Members and 1 Guest are viewing this topic.
Yeah it was way old, like a cool late 60s mud terrain with some sweet weather checking. A real museum piece for sure. To be fair he is a jeep guy. He only did like 100 psi I think and the story was he heard a big bang in his garage, he went in to investigate and the tire had alligatored and peeled his rack and spare tire carrier right off the jeep.
And just for clarification for the calculator police, I don't think it will top off 4 tires from low pressure to low-mid 20s psi, it DID top off 4 tires from trail pressure to low-mid 20s psi. I even reseated a bead with it a time or two with the help of a ratchet strap. Compressed air is compressed, so if you use a load range E for a spare maxed out you get a lot of air out of it. I don't make a habit of posting speculation.
Calculator police here....We start with the ideal gas law: PV=NRT. R is a constant always, and we will assume that V is the same for the spare as for all 4 tires. We will also assume that ambient temperature stays the same over the course of the inflation.The 10-ply, load range E spare is pumped up to 120 PSI. That means it contains PV/RT or 120*V/RT moles of gas. How many tires can we inflate from 8 to 25 PSI with this setup?For convenience, I'm going to say that V/RT = C, some constant. A tire of volume V at 8 PSI contains 8*C moles of air, and at 25 PSI contains 25*C moles of air. We thus need 17*C moles of air to air up one tire. How many tires can we air up to 25 PSI? We have 95*C moles of air available before the spare is down to 25 PSI. Therefore, we can write95C = nTires*17CnTires = 95C/17C = 95/17 =~ 4.Note: this assumes that tires do not change volume as they inflate: This is obviously wrong! However, certain aspects of this error tend to cancel each other out. To know how many tires you can really inflate this way, try it or calculate more carefully. However, 4 is all we care about usually and H8PVMNT already showed that it worked.H8PVMNT, the calculator police is on your side....
How did you determine the volume of the tire?
...The 10 ply 235/85 r16 load range E spare had a max inflation of 120 psi.
Started by toyotamobing Parts Wanted
Started by alex-toy83 Engine
Started by vaj70cruiser Parts Wanted
Started by 4x4DemonWithin Parts For Sale
Started by WizardMaster Tire and Wheel Tech