RCR wheel mods

#41

"zenit" <zenit (AT) semo (DOT) oz> wrote

Quote:

I've experienced rear tire rotation with sprint cars... On occasion,
the slippage would be marked by a small loss of air pressure... This
happened only on flat track dirt...

With or without a beadlock? Of course the dynamics are completely different
on a pavement car.

But cannot be controlled or predicted.

Carey in Manvel

#42

"Gordon" <jimmygator (AT) gmail (DOT) com> wrote

Quote:

Wouldn't that take the tire/rim outta balance?

For short track, local racing, the tire/wheel combinations are not balanced

like your street tire at Firestone. Quite often we buy a tire and mount it
up right there at the track. Depending on the situation, we will reverse a
tire on a rim.

Carey in Manvel

#43

"Carey Akin" <cmakin (AT) att (DOT) net> wrote

Quote:

"Gordon" <jimmygator (AT) gmail (DOT) com> wrote in message
news:q713h2d91j9bal6u8v8n7k79jn9l68h0ve (AT) 4ax (DOT) com...

Wouldn't that take the tire/rim outta balance?

For short track, local racing, the tire/wheel combinations are not
balanced like your street tire at Firestone. Quite often we buy a tire
and mount it up right there at the track. Depending on the situation, we
will reverse a tire on a rim.

Carey in Manvel
Goodyear does that for them at cup level, no? They get mounted tires at the

track.

-Russ.

#44

"Somebody." <somebody (AT) nospam (DOT) russdoucet.com> wrote

Quote:

Goodyear does that for them at cup level, no? They get mounted tires at
the track.

You know, I believe so.

Carey in Manvel

#45

"zenit" <zenit (AT) semo (DOT) oz> wrote

Quote:

On Wed, 20 Sep 2006 14:56:36 GMT,
"Carey Akin" <cmakin (AT) att (DOT) net
had to open a new box of zerones to say:
"Speeed Racer!" <wedontneedanysteenkingreplies (AT) whodat (DOT) org> wrote in message
news:glcQg.6$wh.3 (AT) trnddc04 (DOT) ..
Why? Just because you say so?
There are far smarter people out there in Na$car than you.
Just because it is beyond *your*comprehension means it doesn't exist? HA!
I'll put you at the end of the long line of folks who said that certain
things were not possible like: A cure for Polio, nuclear fission, air
travel, space travel, DNA identification, cloning, ect, ect.
It is only impossible until someone does it.

Yeah, I would put a "secret" bleeder rim on the level of nuclear fission.
====
Carey in Manvel
=====================================
More like cold fusion in that it is theoretically possible but
practically unlikely...

! -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
zenit

Some smart folks have turned theory into practicality thruout history.
I'll just suggest one name in stockcarracin history--Smokey Yunick.
I'll add one more--RASN's own Mike Marlow--see his earlier contribution.
CRU--Who invited David Poole to do his due diligence in RASN
before going to The Source (whoever that might be, physicists)

#46

"Carey Akin" <cmakin (AT) att (DOT) net> wrote:

Quote:

"Chuck Steak" <Chuck_Steak (AT) nospam (DOT) com> wrote in message

If you can have a tire go from 32# and stop at 16#
from a drywall screw you picked up in the parking lot
someone can make a tire/wheel combo lose pressure and stop at 33.....

Yes, but trying to get that pressure drop to be repeatable and controllable
when important items like the design of the tire and the compound are
outside of your control, it just ain't gonna happen.

I don't see where the tire design or compound has anything to
do with making a rim leak....
We are talking about bleeding off excess pressure here,
the rim has no idea what type of tire is on it...

Quote:

Just don't look at our car TOO closely........

Hey... I used to say that same prayer every week!!!!

Quote:

Carey in Manvel

---------------------------------------------------------------------------------------
Dan

I got a new Matco tool box for my wife.
Best trade I ever made...

#47

"Somebody." <somebody (AT) nospam (DOT) russdoucet.com> wrote in
news:86gQg.39368$43.28902 (AT) nnrp (DOT) ca.mci.com!nnrp1.uunet.ca:

Quote:

"Carey Akin" <cmakin (AT) att (DOT) net> wrote in message
news:UWfQg.78426$QM6.10379 (AT) bgtnsc05-news (DOT) ops.worldnet.att.net...

"Gordon" <jimmygator (AT) gmail (DOT) com> wrote in message
news:q713h2d91j9bal6u8v8n7k79jn9l68h0ve (AT) 4ax (DOT) com...

Wouldn't that take the tire/rim outta balance?

For short track, local racing, the tire/wheel combinations are not
balanced like your street tire at Firestone. Quite often we buy a
tire and mount it up right there at the track. Depending on the
situation, we will reverse a tire on a rim.

Carey in Manvel
Goodyear does that for them at cup level, no? They get mounted tires
at the track.

Yes. Asphalt tires are usually balanced. Dirt track tires usually
aren't, because the wheel picks up enough mud to throw it out of
balance anyway.

John

#48

"zenit" <zenit (AT) semo (DOT) oz> wrote

Quote:

I don't think Smokey ever considered cold fusion as a fuel... But
there was that one time when he got nailed for an illegal gas
source... After they pulled his tank and found it to be legal, Smokey
hopped in his car and drove off, leaving the tank in the hands of the
NASCAR official... That may be just one of those pit myths but who
knows...

Not a pit myth. 'Don't recall the exact details, but he had a considerable
amount of 1 inch line run throughout the car giving a few extra gallons of
capacity.

#49

"Somebody." <somebody (AT) nospam (DOT) russdoucet.com> wrote in
news:YWcQg.39347$43.29574 (AT) nnrp (DOT) ca.mci.com!nnrp1.uunet.ca:

Quote:

Could a sealant be used that expands to fill a small leak only after
sufficient exposure to temperature?

Could this be used to seal a small leak after a prescribed amount of
time/temperature had been reached in the tire?

Man, gotta give you credit for thinking outside the box, like Dan
is saying you need to :-)

The answer to your questions is, as far as I know, yes. The
problem with the idea is that you're going to leak air for a
while till the wheel heats (could be a couple of laps on a
green flag stop, could be 10 or 12 laps if they tool around
under caution), then it'll seal with some unpredictable pressure
in the tire, and stay sealed, which might allow the pressure
to come back up, depending on how the driver drives and how low
it got to start with.

Altho there's some mighty weird materials in the world now, I
don't know of one that solidifies at low pressure & liquifies
at a higher one (I know of some that work the reverse, they're
popular for things like full-time 4wd systems).

Thing is, tho, that you're looking at the problem too closely.
You need to step back and look at the whole car. On the car
there's 4 wheels, each of which works best at a particular
pressure, and each of which is subjected to different loads.
If we cut a slit in the rim, and depend on the tire bead to
flex & seal it, or some magic goo, we'd still have to figure
out how to make it do it's thing differently for each of the
4 wheels, so we get the right pressure (or something close)
in each. And there's just too much unpredictability for that
to be practical.

John

#50

"Mike Marlow" <mmarlow (AT) alltel (DOT) net> wrote in
news:a11a$451131f0$471fbb8f$30876 (AT) ALLTEL (DOT) NET:

Quote:

A slit or a hole can indeed bleed down to some lesser pressure level
and then stop bleeding. It happens every day on cars all over the
road. Slow leaks around the bead (common to alloy wheels), punctures,
etc. will leak down to 12 pound (as an example), and stay there for
long periods of time whether just sitting or driving every day. The
defect is such that it requires a minimum amount of pressure to
overcome the natural tendancy of the rubber to remain contracted.

You're not accounting, here, for the difference in the forces exerted
on a racing tire versus a street tire. A street tire might seal up
against the rim after it's leaked down a bit, and stay pretty tight.
A racing tire will unseal every time the car goes into the corner
and side-loads the tire.

Plus, as I mentioned to Russ, you've still got the problem of
making all 4 corners leak in the proper proportion to what each
needs for good traction.

John