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Old 03-16-2008, 02:36 PM   #1
08C6Z51
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Default Tires Losing Pressure

Just got an 08 C6 Z51 triple black. Due to weather it has been garaged all winter without much use. with only 400 miles on odometer. Is it normal for the tire pressure to drop while the car is only sitting in the garage? It drops down to 22 to 27 PSI in all four tires.

When we bought the 'Vette they filled the tires with nitrogen, stating it would prevent air leaks. It hasn't worked (didn't really believe it would anyway).

Thanks for any input. Don
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Old 03-16-2008, 02:41 PM   #2
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Well technically, if the tires are filled with nitrogen, they won't leak air. There is no air to leak. But they will leak nitrogen.
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Old 03-16-2008, 02:58 PM   #3
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Depending on how warm it was when you put it in there and how warm it is in there now it is possible.
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Old 03-16-2008, 02:58 PM   #4
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Nitrogen will leak out easier than air (molecules are smaller I think, but its relative anyway). The only advantage nitrogen serves is that because it is dry (no moisture) it won't expand as much as air out of a compressor that hasn't had the water drained in a while. The pressures stay almost the same whether the tires are hot or cold. Thats why pro race teams use it.
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Old 03-16-2008, 02:59 PM   #5
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Make sure the nuts on the valve stems are tight.
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Old 03-16-2008, 03:02 PM   #6
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Quote:
Originally Posted by 08C6Z51 View Post
Just got an 08 C6 Z51 triple black. Due to weather it has been garaged all winter without much use. with only 400 miles on odometer. Is it normal for the tire pressure to drop while the car is only sitting in the garage? It drops down to 22 to 27 PSI in all four tires.

When we bought the 'Vette they filled the tires with nitrogen, stating it would prevent air leaks. It hasn't worked (didn't really believe it would anyway).

Thanks for any input. Don
Normal for pressure to drop as it gets colder.

Nitrogen has no capacity to seal leaks. It is a gas.
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Old 03-16-2008, 03:03 PM   #7
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Cold weather will always do that. Mine are down to about that now after sitting for the past 5 months. They'll come close to normal as either you or the weather warms them up.
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Old 03-16-2008, 03:03 PM   #8
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Quote:
Originally Posted by kenjeffries View Post
Well technically, if the tires are filled with nitrogen, they won't leak air. There is no air to leak. But they will leak nitrogen.
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Old 03-16-2008, 03:14 PM   #9
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Had the same issue with mine....put my vert away in November and this past week the tire pressure was down also. The tires on the Z51s are very sensitive according to GM.....fill them up to proper pressure and just keep an eye on them. Should be OK once we start using the cars on a regular basis with the nice weather.
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Old 03-16-2008, 03:15 PM   #10
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Tires filled with air will drop on average 1 pound for every 10 degree drop in temperature. This is why they recommend 30 psi cold as the fill so that as the tire heats up it will get them up to about 34 psi while on the highway. It isn't likely a leak as much as it is density changes.

Tire pressure is not a set it and forget it item. It will need to maintained as the seasons and temperature change.
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Old 03-16-2008, 03:21 PM   #11
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Quote:
Originally Posted by 08C6Z51 View Post
Just got an 08 C6 Z51 triple black. Due to weather it has been garaged all winter without much use. with only 400 miles on odometer. Is it normal for the tire pressure to drop while the car is only sitting in the garage? It drops down to 22 to 27 PSI in all four tires.

When we bought the 'Vette they filled the tires with nitrogen, stating it would prevent air leaks. It hasn't worked (didn't really believe it would anyway).

Thanks for any input. Don
That is a serious problem and i think they need to be replaced and sent to me.
You pay shipping also...
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Old 03-16-2008, 03:45 PM   #12
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Quote:
Originally Posted by talon90 View Post
Tires filled with air will drop on average 1 pound for every 10 degree drop in temperature. This is why they recommend 30 psi cold as the fill so that as the tire heats up it will get them up to about 34 psi while on the highway. It isn't likely a leak as much as it is density changes.

Tire pressure is not a set it and forget it item. It will need to maintained as the seasons and temperature change.

Last edited by BigButtLover; 03-16-2008 at 03:47 PM.
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Old 03-16-2008, 04:11 PM   #13
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Check your TPMS stem torque values...I had a light leakdown in my right rear...Bought a cheap ($20) 1/4" Harbor Freight torque wrench and retorqued all of them to 60 inch pounds. Every one of them was under spec by a goodl amount. Seems to be holding just fine now..
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Old 03-16-2008, 10:00 PM   #14
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Quote:
Originally Posted by Red86Cfour View Post
Nitrogen will leak out easier than air (molecules are smaller I think, but its relative anyway). The only advantage nitrogen serves is that because it is dry (no moisture) it won't expand as much as air out of a compressor that hasn't had the water drained in a while. The pressures stay almost the same whether the tires are hot or cold. Thats why pro race teams use it.
Nitrogen molecules are larger than oxygen, thats one of the reasons it's not supposed to leak.
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Old 03-16-2008, 10:15 PM   #15
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Quote:
Originally Posted by mikesul View Post
Nitrogen molecules are larger than oxygen, thats one of the reasons it's not supposed to leak.
You might want to consult the periodic table. In any case, nitrogen isn't going to "prevent" a leak any more than using air out of a compressor will.
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Old 03-16-2008, 10:46 PM   #16
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Thanks for the replies. I am learning as I go with this new car. We've had a C3 (74) Vette for years and I work on the old one myself but I wouldn't touch the new one (yet).

Last edited by 08C6Z51; 03-16-2008 at 10:55 PM.
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Old 03-16-2008, 11:48 PM   #17
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Quote:
Originally Posted by Originally Posted by mikesul
Nitrogen molecules are larger than oxygen, thats one of the reasons it's not supposed to leak.
Quote:
Originally Posted by Red86Cfour View Post
You might want to consult the periodic table. In any case, nitrogen isn't going to "prevent" a leak any more than using air out of a compressor will.
The N2 molecule does have a larger diameter than the O2 molecule. The reason is that oxygen is more electronegative than nitrogen, so the molecular bonds are stronger and pull the atoms closer together. It isn't all that much closer, though, and ordinary air includes other gases, such as CO2 and H2O, which are much larger than either N2 or O2. So molecular diameters don't really count for much in the comparison between pure N2 and 78% N2 (ordinary air).

The key thing to remember is PV = nRT. It isn't just a good idea, it is the law, the ideal gas law, and pure nitrogen has to obey it just the same as ordinary air does. What it means is that pressure rises and falls in proportion to changes in temperature. For auto tires filled with either pure or 78% nitrogen, that means a 1 PSI pressure change for every 10 degree change in temperature.
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Old 03-17-2008, 12:16 AM   #18
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Originally Posted by su8pack1 View Post
Cold weather will always do that. Mine are down to about that now after sitting for the past 5 months. They'll come close to normal as either you or the weather warms them up.
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Old 03-17-2008, 12:18 AM   #19
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Quote:
Originally Posted by talon90 View Post
Tires filled with air will drop on average 1 pound for every 10 degree drop in temperature. This is why they recommend 30 psi cold as the fill so that as the tire heats up it will get them up to about 34 psi while on the highway. It isn't likely a leak as much as it is density changes.

Tire pressure is not a set it and forget it item. It will need to maintained as the seasons and temperature change.
When I store my cars in the first of November, I inflate tires to 40lbs air pressure. Come April, I check and pressure is down to 30lbs. Cold weather will decrease pressure as talon90 stated, 1lb for every 10 degrees drop in the temp.
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Old 03-17-2008, 12:24 AM   #20
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This is akin to the way helium leaks out of a balloon faster than air does...smaller molecules...
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Old 03-17-2008, 12:24 AM
 
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