flying belgian
Well-known Member
Why does it seam to take longer to pump truck tire to 110 lbs. when there is a load on it?
ecause you are in a hurry then. Ever heard the old adage "A watched pot never boils"?(quoted from post at 22:30:58 02/10/16) Why does it seam to take longer to pump truck tire to 110 lbs. when there is a load on it?
(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.
Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.
Maybe I'm wrong...someone explain it to me.
Thanks
(quoted from post at 21:37:55 02/10/16) eye4iron- "Load or no load the psi stays the same within reason. Even
though the tire may be flat because of an overload it widens
on the sides"...
If the tire pressure difference is insignificant and the sidewalls accommodate for the change, then why is there such a 'BIG' recommendation to be sure to check tire pressure between winter and summer driving?...Shouldn't the sidewalls make up for this difference(by your explanation)?
Just curious...
(quoted from post at 04:45:59 02/11/16)(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.
Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.
Maybe I'm wrong...someone explain it to me.
Thanks
Think of it like this...
The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.
Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.
But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
Not sure if that makes sense to you or not...
(quoted from post at 20:24:42 02/11/16)/quote](quoted from post at 04:45:59 02/11/16)(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.
Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.
Maybe I'm wrong...someone explain it to me.
Thanks
Think of it like this...
The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.
Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.
But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
Not sure if that makes sense to you or not...
Try this again
But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
(quoted from post at 23:27:26 02/11/16)(quoted from post at 20:24:42 02/11/16)/quote](quoted from post at 04:45:59 02/11/16)(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.
Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.
Maybe I'm wrong...someone explain it to me.
Thanks
Think of it like this...
The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.
Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.
But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
Not sure if that makes sense to you or not...
Try this again
But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
When I wrote that, I wasn't thinking about a tag axle, but rather, the regular air suspension bags. Regular air bags, use air bag pressure to push the suspension down away from frame, keeping the truck up. So when I said, "keep the suspension up" I guess what I meant was "keep the frame up?" I do know that my hauler knows when I get him within a few hundred lbs of his limit based on the pressure in the bags. I've never (unintentionally) put him over his limit yet.
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