 | |
#41
 
| |||
| |||
|
Re: RCR rims, NASACAR SAYS IT DIDN'T HAPPEN -
09-19-2006
, 06:23 PM
|
"SimRacer" <nOspaM@simracer68 (AT) yahoo (DOT) com> wrote in message news  dYPg.31534$Md4.22313 (AT) tornado (DOT) southeast.rr.com..."Michael E" <racingfast (AT) anycost (DOT) org> wrote in message news:Z_ydneESaOqF0o3YnZ2dnUVZ_rednZ2d (AT) comcast (DOT) com... "SimRacer"<nOspaM@simracer68 (AT) yahoo (DOT) com> wrote Right on Carey. I didn't think I could make it any plainer. Guess I have to remember the audience on occasion... I've often wondered why it is that you only seem to communicate with a small portion of those who use this forum. Your last statement tells me all that I need to know about that situation. Hey, it's a free country. I'll consider myself KF'd on your end, and we should be fine then. I don't use killfiles for anyone other than political crossposters or habitual trolls. I just choose to ignore the assholes, thank you. |
a-hole, yet you're the one cursing.
#42
| |||
| |||
|
| The fact that your theory about a small hole just bleeding off air beeing wrong. It would bleed off all the "air" in the tire without a valve of some sort in place to stop the bleeding once the pressure got to where the CC or whomever wanted. |
is to create a slow leak that would leak out air approximately at the rate
that the pressure builds in the tire. And while it's true that all the air
would eventually leak out, keep in mind that the tires are on the car for
only about 30 minutes max.
#43
| |||
| |||
|
| If I was into more than just casually, and ran a class that actually held more races and paid more money, I'd probably go with nitrogen too. Not for the cost, really, but for the issue of finding it and keeping it on hand. As it is, it's a basic single stage 10 gallon Craftsman air compressor that I run off my generator (if I need more air than we pack into the track). That also comes in handy when I need the strength of an air ratchet or some other basic air-powered power tool. We store our air in an old O2 bottle. Our owner, a former fireman, gets it |
for their air packs.
Quote:
| Yeah, I was thinking 5-8 psi, so 4 psi doesn't shock me. Plus I grasp the conceptual difference between PSI and volume. A big tire can have plenty of "air" in it, but that air be at a low PSI, and all work great. Then you have a racing bicycle tire can have very little volume, but be spec'd for close to 110 psi....sounds crazy on the surface, but makes all sorts of sense on the scientific level. Yup. That is why I am being very careful to post psi instead of pounds. I |
Kind of like ships and tonnage. . . . . .
Carey in Manvel
#44
| |||
| |||
|
| I think the theory of the .003" (about the thickness of a human hair) slots is to create a slow leak that would leak out air approximately at the rate that the pressure builds in the tire. And while it's true that all the air would eventually leak out, keep in mind that the tires are on the car for only about 30 minutes max. But in order to be effective, they would have to dump the excess pressure as |
want to try and control the variables. With a normal tire, you can accept a
couple of laps of a car not being perfect while the pressure builds up.
From there, the pressure and the handling effect will be consistent from a
tire response/pressure aspect. With so many other changes in a green flag
run, i.e. fuel load, on track conditions; the last thing a crew chief or
team engineer wants to introduce is a slowly leaking tire. There really
isn't any way to truly control the rate of leakage since the bead, as well
as being the sealing surface, is also undergoing dynamic loading; which
would also have an effect on the leak. When the needed pressure is being
measured in such small increments, it just doesn't make sense from a
mechanical point of view.
Carey in Manvel
#45
| |||
| |||
|
|
"SimRacer" <nOspaM@simracer68 (AT) yahoo (DOT) com> wrote in message news:YHYPg.31537$Md4.27496 (AT) tornado (DOT) southeast.rr.com... Oh yeah, those sprint tires look absolutely flat on TV sometimes. I imagine their cold/starting PSI is in the single digits. Much like the wrinkle-wall tires that the NHRA uses. Those have some scary low PSI numbers at times if I had to guess too. 4psi on a dry track isn't unusual. It IS a pain in the ass when a bleeder gets stuck open with a piece of dirt or other trash, though. |
to worry about the tire & the rim having different opinions on
how fast to rotate.
John
#46
| |||
| |||
|
|
Kind of like ships and tonnage. . . . . . |
John
#47
| |||
| |||
|
| Considering the fact that Burton couldn't qualify in the top 10 practically the entire time he drove for Roush, I'd say his qualifying efforts this season would be nothing short of a miracle, or maybe it's just an engineering marvel... Why are so many outraged about these allegations anyway? |
If similar allegations were made of the 48 team, very few would be defending
them.
#48
| |||
| |||
|
|
"Michael E" <racingfast (AT) anycost (DOT) org> wrote in message news:aZmdnRT_g-sau43YnZ2dnUVZ_tCdnZ2d (AT) comcast (DOT) com... Considering the fact that Burton couldn't qualify in the top 10 practically the entire time he drove for Roush, I'd say his qualifying efforts this season would be nothing short of a miracle, or maybe it's just an engineering marvel... Why are so many outraged about these allegations anyway? Have they forgotten that the 29 team has a history of "bending" the rules. If similar allegations were made of the 48 team, very few would be defending them. |
bending the rules, then they were caught bendig the rules. if they were
caught cheating, then all punishments would be acceptable. for one reason
or another Dilner was gullible enough to run w/ a story w/o checking his
source to scoop the rest of the journalists out there and it came back to
bite him. to me i think the person was of a reliable enough source that
Dilner felt comfortable getting the story out there, but what was the reason
for the bad info? honest mistake or to make Dilner look bad? maybe it was to
have the #29 and #31 gone over in more detail in post race inspections at
this race and pre and post inspections at the up coming races hoping to
throw the RCR crews off their games. someone out there may see RCR as a
threat for the cup championship since the busch championship is pretty much
locked up.
mike...........
#49
| |||||
| |||||
|
|
But in order to be effective, they would have to dump the excess pressure as it built up. It just doesn't make sense. |
arguing that I believe the practice is being carried out, but it certainly
would not surprise me if it had been carefully examined by teams. Hell - if
it were such an absurd thought, it would not be getting the attention it
currently is. So far the only voices saying it is absurd are those in this
forum. NASCAR and the teams are not arguing that it is impractical in
theory, they are (quite the contrary), arguing that they are not doing it.
I do believe there is a big difference between what short track teams and
Saturday night special teams understand about these things and what the big
money Cup teams understand. Remember - it's the more absurd stuff that
people overlook or discount that is often what works. Thinking out of the
box and all of that.
To your point Carey - I really don't know if this would work, or how to
control it myself, but I can at least see how it is possible. A controlled
leak will work just like a puncture works. It requires a minimum amount of
pressure to overcome the natural self-healing nature of rubber, and result
in a loss of pressure. Anything less than that and the tire maintains its
pressure. As temps build and pressure rises, you can overcome that minimum
pressure, resulting in a bleed. Bleed down to that minimum and the tire
heals.
Quote:
|
As I stated in another post, you want to try and control the variables. With a normal tire, you can accept a couple of laps of a car not being perfect while the pressure builds up. From there, the pressure and the handling effect will be consistent from a tire response/pressure aspect. |
place.
Quote:
|
With so many other changes in a green flag run, i.e. fuel load, on track conditions; the last thing a crew chief or team engineer wants to introduce is a slowly leaking tire. |
Quote:
|
There really isn't any way to truly control the rate of leakage since the bead, as well as being the sealing surface, is also undergoing dynamic loading; which would also have an effect on the leak. |
is going to see a minimum and a maximum force in any given (normal) run.
Calibrate your slit for the desired maximum and you've theoretically
achieved better balance.
Quote:
|
When the needed pressure is being measured in such small increments, it just doesn't make sense from a mechanical point of view. |
pounds from the time they go on cold to the point of heated up in the middle
of the run.
--
-Mike-
mmarlowREMOVE (AT) alltel (DOT) net
#50
| |||
| |||
|
|
Register or displacement? Very good. Register (measured as gross and net tons), at one time was a |
"factor" loosely based on internal volume. Displacement is used for
stability and other naval architectural purposes.
Do you have some maritime background?
Carey in Manvel
 |
« Previous Thread
|
Next Thread »
| Thread Tools | |
| Display Modes | |
Linear Mode
| |
Powered by vBulletin
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.