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just curious bar/PSI conversion

F

fixerupper

Well-known Member
Just bought a tire changer-China made. I know, but by my understanding, they're all made there. Please, somebody refute that and tell me there IS an American made one out there.

The pressure recommendation for setting the pressure regulator is in bar instead of PSI. If my feeble memory serves me right the book mentioned setting the pressure at 8 bar. I coughed up a conversion table on the net and it gives two figures- PSI and PSI absolute. Straight 8 bar is 116 PSI. By the absolute figure 8 bar is 101 PSI absolute, meaning minus atmospheric air pressure. I assume the gauge on yours and my compressor reads plain PSI so I should set the pressure at 116. Sometimes I wish these charts wouldn't get technical so undereducated dummies like me don't get confused! LOL Do any of you guys and gals know the answer? Jim
 
So we are looking at plain old everyday PSI and not the absolute stuff. I kind of figured that. The website I found only had a calculator and didn't have a table. Thanks. Jim
 
(quoted from post at 15:21:06 02/08/13) Just bought a tire changer-China made. I know, but by my understanding, they're all made there. Please, somebody refute that and tell me there IS an American made one out there.

The pressure recommendation for setting the pressure regulator is in bar instead of PSI. If my feeble memory serves me right the book mentioned setting the pressure at 8 bar. I coughed up a conversion table on the net and it gives two figures- PSI and PSI absolute. Straight 8 bar is 116 PSI. By the absolute figure 8 bar is 101 PSI absolute, meaning minus atmospheric air pressure. I assume the gauge on yours and my compressor reads plain PSI so I should set the pressure at 116. Sometimes I wish these charts wouldn't get technical so undereducated dummies like me don't get confused! LOL Do any of you guys and gals know the answer? Jim
Click to expand...

Typically pressure gauges read in PSI and will read 0 PSI at atmospheric pressure. This is also called gauge pressure. I assume the pressure gauge on your tire changer reads in PSI and reads 0 without compressed air supplied to it. If this is true, you will want to set the regulator for 116 PSI gauge pressure.

There are pressure gauges which read absolute pressure in PSIA and will read 14.7 PSIA at atmospheric pressure. At 8 bar pressure absolute an absolute pressure gauage should read 116 PSIA (absolute pressure). I think the chart was trying to show 8 bar pressure absolute is 101 PSI (gauge pressure).

If the instructions want you to set an absolute pressure they should specify "absolute"; otherwise it is 8 bar x 14.5 PSI = 116 PSI.

Good Luck with the tire changer.
 
Thanks, Ken, for the explanation. We spun a couple of wheels on it and it does what it's supposed to do. This changer is no frills but cost a bit more because it's supposed to be designed with more power for larger ag wheels. I run older machinery with weathered tires that have seen at least 20 years in the sun so tire changing seems to be a popular recreation on this farm. Jim
 
I bought a WELL USED Corghi tire machine around Thanksgiving time this year.. Got $105.50 invested in it, plus the gas to haul it home.

It's almost paid for itself already..

Dad and I have just one problem.. we really can't get enough pressure to "spin" the tire all the way on.. when putting the last bead onto the rim, we got to kinda help it around the last little bit.. Could be the air rotator motor is getting bad, but the tire guy in town says he runs 150 pounds on his machine that is nearly identical, we can only get about 130 pounds out of my compressor.

Sure makes for easier work than the slide hammer and spoons though.. I told dad I don't know how we've gone on this long without one lol.

Brad
 
About a year and a half ago I had a deal made on a one year old Corghi and then the seller backed out. Kind of a strange situation all around. I looked on the Corghi website and they have a zillion different models with about as many add-on features and prices to go along with the features. This one I bought is a Coseng that's supposed to do tough big ag tires. Notice I said "supposed". LOL

Dealer claims it has a 1.5 HP turn table motor and 7000 LB bead breaker instead of the normal 1 HP motor and 5000 lb breaker. Probably just sales hype. I don't know if I made a good move or not. We'll wait and see. Jim
 
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