Accurate Tire Pressure Measure with Dry Ice

[unruhly]

This thread is hillarious! That was the intent right?

How about a "cold" air intake for the use of your extra dry ice. AKA "Prius Bong!"
Mount a small cooler on top of your hood and route the air filter intake through the bottom of the cooler. Packed with dry ice, you could even keep a 'couple of cold ones in there.

Disclaimer: This poster does not condone the use of alcoholic beverages while vehicle is in motion.

[Three60guy]

Get free dry ice
place inside tires
inflate to desired pressure
enjoy frictionless tires due to temperature of tires.

Boy, ya gotta love these guys. They think of the weirdest things.

Ok guys repeat after me......

I will just check tire pressure before driving.
I will not do stupid things like use dry ice on tires.

repeat 50 times

[M. Oiseau]

Prius bong?! ... BRILLIANT!!!

-OR-

Load the dry ice in a cooler in the Prius and initiate a mobile wart removal service. Maybe have an imagineered giant wart mounted to the roof of the car.

With the dry ice on hand, you will be able to 'accurately' check tire pressure at any time, say at a stop light when nothing is happening anyway. This is way better than a Chinese Fire Drill (please, no offense intended to Americans of Chinese descent or affiliation or to any of our Chinese friends).

[Betelgeuse]

Pfft! Amateurs!

I submerge my tires in Liquid Nitrogen (-196C), NOT dry ice (-79.5 C). I'm still working on filling my tires in the dead of space (3 K or -270C), but that's proving to be more problematic than originally thought. If anyone knows of a launch vehicle that gets better than 50 MPG, I'd be much obliged.

Thanks.

[galaxee]

oh my.

tires lose pressure when it gets cold out because the volume of gas changes with lower temperature. one of the variables in gas volume is temperature. so 42 psi in dry ice is going to be, like daron points out, much much higher at outside temperature in the summer.

take the dry ice, put it in a soda bottle, add water, cap tightly, shake, set in the street, and run. and don't touch with your bare hands or breathe the vapors.

[Sufferin' Prius Envy]

If you need to drive to your air source at a gas station, etc:

First thing in the morning (no, not in Manitoba in the winter ) take pressure readings on all four tires and write them down and calculate how many psi each tire is under inflated from your ideal. If the tire reads 32 psi and you want 35 psi, the tire is deficient 3 psi.
Drive to your air source.
Starting with the tire which read closest to your ideal pressure, take another reading. If the new PSI reading is, for instance 38 PSI, pump it up another 3 PSI higher.
Move to the other tire.
Take a pressure reading if you want . . . you'll see the hot temperature shows the same difference . . . so this step is actually not necessary.
Fill the tire to the same 41 PSI you inflated the first tire to.

The comparatively little volume of new air you pump into the tire isn't going to make much of a difference in the temperature induced pressure inside the tires. Air is a poor conductor of heat, and the hot mass of the tires will keep the pressure up until the tires themselves cool down. (this is of course assuming you aren't inflating your tires with liquid nitrogen. )

I have use this method for years. The next morning when I checked the tire pressures, they are exactly right where I expected. I no longer bother checking the pressures the next morning. I know what the readings will be.

Of course with the Prius, you have two different pressures to consider – front and rear - but the concept is the same.

[M. Oiseau]

<div class='quotetop'>QUOTE(Sufferin' Prius Envy @ Jul 14 2006, 01:52 PM) [snapback]286331[/snapback]</div>

If you need to drive to your air source at a gas station, etc:

First thing in the morning (no, not in Manitoba in the winter ) take pressure readings on all four tires and write them down and calculate how many psi each tire is under inflated from your ideal. If the tire reads 32 psi and you want 35 psi, the tire is deficient 3 psi.
Drive to your air source.
Starting with the tire which read closest to your ideal pressure, take another reading. If the new PSI reading is, for instance 38 PSI, pump it up another 3 PSI higher.
Move to the other tire.
Take a pressure reading if you want . . . you'll see the hot temperature shows the same difference . . . so this step is actually not necessary.
Fill the tire to the same 41 PSI you inflated the first tire to.

The comparatively little volume of new air you pump into the tire isn't going to make much of a difference in the temperature induced pressure inside the tires. Air is a poor conductor of heat, and the hot mass of the tires will keep the pressure up until the tires themselves cool down. (this is of course assuming you aren't inflating your tires with liquid nitrogen. )

I have use this method for years. The next morning when I checked the tire pressures, they are exactly right where I expected. I no longer bother checking the pressures the next morning. I know what the readings will be.

Of course with the Prius, you have two different pressures to consider – front and rear - but the concept is the same.
[/b]

Uhm...what about the dry ice?

[tnthub]

The "Prius Bong" concept is actually utilized at drag races... It is fairly common practice for cars (in certain clases), with metal intakes to use ice to cool the air intakes immediately prior to crossing into the staging area for the burnout. Of course, to go along with the cold air, many people have "bottle warmers" for their nitrous...

[rufaro]

Dudley, don't get upset by the tone of some of the replies to your question...some of us get cranky when we haven't been inside our cars for too long. We're really a, um, COOL bunch.
<div class='quotetop'>QUOTE(Three60guy @ Jul 14 2006, 11:13 AM) [snapback]286309[/snapback]</div>

Get free dry ice
place inside tires
inflate to desired pressure
enjoy frictionless tires due to temperature of tires.

Boy, ya gotta love these guys. They think of the weirdest things.

Ok guys repeat after me......

I will just check tire pressure before driving.
I will not do stupid things like use dry ice on tires.

repeat 50 times
[/b]

Ok guys repeat after me... (ESPECIALLY daronspicher, alnilam, and, Three60guy--naughty boys--were you never newbies yourselves?)


There is no such thing as a stupid question
repeat 50 times

[brandon]

<div class='quotetop'>QUOTE(Rufaro @ Jul 14 2006, 02:41 PM) [snapback]286354[/snapback]</div>

There is no such thing as a stupid question
[/b]

This is true. However, there are things such as really, really ignorant questions (not to imply this is one of them), i.e., "Where's the 'Any' key?"

More discussion on "stupid" questions:
http://www.janisian.com/forum/archiv...php/t-206.html