A Call For Humor!

[ta240]

My theory is that the washing machine actually creates a brand new sock by collecting all the little bits of thread that come off the existing socks and knitting a new one.

 

[mhardy6647]

I just want to remind all y'all of this fine example of a post some time back in this very thread.

I am sorry that I cannot provide a link to the precise post in question -- it's too hard, and I am too effing lazy, I fear.

 

[Keith_W]

View attachment 339518

That is really not funny. If this is real, it is totally irresponsible! I can imagine my wife looking at this sticker and doing exactly what it recommends.

 

[thegeton]

My theory is that the washing machine actually creates a brand new sock by collecting all the little bits of thread that come off the existing socks and knitting a new one.

Or maybe, they go to another planet/dimension...?

 

[Canuck57]

 

[Canuck57]

 

[thegeton]

View attachment 339562

This is part of my wife's belief system.

 

[DonR]

That is really not funny. If this is real, it is totally irresponsible! I can imagine my wife looking at this sticker and doing exactly what it recommends.

Given the tire sizes, I suspect it is a sports car of some sort.

 

[ta240]

That is really not funny. If this is real, it is totally irresponsible! I can imagine my wife looking at this sticker and doing exactly what it recommends.

The 40lbs pressure in the tires, the 150mph or both?

 

[Keith_W]

The 40lbs pressure in the tires, the 150mph or both?

Both? Correct me if I am wrong, but if you overinflate your tyres and drive at high speed, the heat increases your tyre pressure even more. This would cause the tyre to balloon and reduce the contact patch, not to mention ballooning from the centripetal forces at high speed. Either way - less contact patch, potential for tyre failure from overinflation + high speed will lead to disaster.

 

[xray]

When I took the BMW Advanced Driving course that's exactly what they told us to do prior to arriving at the race track.

 

[Blumlein 88]

Both? Correct me if I am wrong, but if you overinflate your tyres and drive at high speed, the heat increases your tyre pressure even more. This would cause the tyre to balloon and reduce the contact patch, not to mention ballooning from the centripetal forces at high speed. Either way - less contact patch, potential for tyre failure from overinflation + high speed will lead to disaster.

Yes, but what is over-inflation. Many tires now have 50 psi max even though your car may specify lower pressures for most driving. My understanding is tires at lower pressure generate more heat at high speed. So increasing the pressure as long as it is not too much is helpful. Higher pressure also helps in cornering at speed so the tire stays on the rim. Not as much an issue with modern extra wide tires. The SCCA suggests raising tire pressure 10 psi when taking part in their events to prevent damage to the edge of the tire in high G cornering.

I don't know about that sticker, but AMG Mercedes have such a sticker in the fuel flap. I'd assume they know what they are doing.

 

[xray]

My take on this is that you need the additional tire pressure to stiffen the sidewalls when you corner at high speeds. Too much flex will generate heat and possibly even separate the bead from the rim.

 

[ta240]

We used to chalk the side of the tire to see how much got scrubbed off in the corners to tell if we needed a bit more pressure. But that was outcrossing and not high speed straights.

According to TireRack "A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain."

 

[xray]

I suspect a major part of achieving a Z or higher tire speed rating is having stiff enough sidewalls to handle the additional pressure and hard cornering.

 

[Speedskater]

Note that NASCAR, F1 and NHRA all run very low tire pressures.
Sometimes rules or tire failures limit how low the pressure can be.

 

[sergeauckland]

What I find confusing is how am I supposed to increase the tyre pressure when approaching 150mph? I can't get out at that speed.

S

 

[Hiten]

 

[jp4573]

Both? Correct me if I am wrong, but if you overinflate your tyres and drive at high speed, the heat increases your tyre pressure even more. This would cause the tyre to balloon and reduce the contact patch, not to mention ballooning from the centripetal forces at high speed. Either way - less contact patch, potential for tyre failure from overinflation + high speed will lead to disaster.

The part of the tire that enter in contact with the road suffer a deformation and again when leaves the contact with the road. This produce the heating of the tire.
When you increase the pressure inside the tire you decrease the tire print on the road(*), then decrease the deformation of the tire, then decrease the heating.
(*) also decrease the grip.

 

[mhardy6647]

What I find confusing is how am I supposed to increase the tyre pressure when approaching 150mph? I can't get out at that speed.

S

I just keep it below 145. Problem solved!

Meanwhile, from (and for) our ornithologist friends...
Since Cooper's and Sharp-Shinned hawks (or, as we call 'em at our house, Coopies and Sharpies) can look quite similar, this handy field guide might come in... umm... handy.