Thanks for the airplane tire info.......something to chew on.
As for the tire wear I believe you are right on as to the loading & unloading
of the IRS. I have simulated the rear lift by putting the car on a lift and
moving it up to the height I believe it runs "at speed". If you use the stock
suspension & Strut rods & mounts it will travel over 2 degrees. If the camber
goes over center, the car spins, so this is a critical thing. I got the car to
go straight thru trial & error, tweaking the alignment after each pass until I
was happy with it. Last year at SpeedWeek (98) somebody (I think it was Bill
Ward) said "yeah, maybe it goes straight at 210, but how do you know it will at
220?" To make a long story short, that comment got me thinking about handling
at future speeds. Didn't get the changes made for this SpeedWeek, but am doing
it now. By using stronger brackets, heavy duty adjusting cams, and using
thicker strut rods, I have the camber change down to 1/2 degree.
Much better, but if this car was ever to see some serious speed, I would have
to put in a solid rear end. My goal for now is to put the C/GT record up a
couple of notches and then move on to something else.
Ed
Beth Butters wrote:
> I believe their may be a relatively unexplored area for possible
>tires, that being airplane tires. A few years ago I found a place in Texas, I
>believe that sold military surplus tires to farmers as is or recapped with a
>traction tread. They are nearly indistuctable and impervious to nails and
>thorns. Any how there are jet aircraft tires in the 28 to 30" O.D size
>that appeared perfect to me. The price as I remembered was under $50. I asked
> a friend of mine that's a aeronautical engineer, I think he can spell it, He
>said well they are made to sustain very high loads for a short period of time,
> I also learned that the military sometimes recaps these tires several times,
>so I guess they don't break down very much. I forgot to mention that the tires
>are 12 to 20 ply and for 15" or 16" wheels. I guess we can assume that its
>okay to run these tires as they have and are being run on the salt since
>that's what the big diesel trucks run and that F- series truck
> with the what is it a 871 Detroit in it that ran l98mph this year has real
>tall ones on the back for the gearing advantage. I am sure these tires are
>big bucks new, but it may well be possible to get some good used ones for a
>small percentage of the new cost. I wouldn't count on me to be able to find
>the address of the company that sells them but I'll look around maybe someone
>that is adept at Internet searches can find it or other sources. L. Kvach
>Butters,,,, oh ya I am wandering if the strange wear pattern on your tires
>is from your IRS loading and unloading Ed, or not being evenly heat cycled
>when they were first run????
>
> ----------
> From: Ed Van Scoy[SMTP:edvs@idt.net]
> Sent: Wednesday, November 10, 1999 2:56 PM
> To: John Beckett
> Cc: David Haller; land-speed@autox.team.net
> Subject: Re: Tires
>
> John,
> Generally they never see the light of day except for race time......My
> Goodyear guy said the wear was nothing to really worry about, but
> suggests replacing them every 4 years as the sidewalls are not as strong
> as LSR tires, and thus flex. (Course he SELLS 'em)
> Like you I need a 27.5 6 or 8" tire, any help out there?
> Ed
>
> John Beckett wrote:
> >
> > Ed
> >
> > I have a set that I ran on the salt, and some at Maxton, for eight years. 60
> > lbs. pressure (that's what Goodyear recommended). Never had any coloring
> > problems or funny wear patterns. Keep em out of the sun as much as possible
> > it will help with the cracking problem.
> >
> > JB
> > -----Original Message-----
> > From: Ed Van Scoy <edvs@idt.net>
> > To: David Haller <dhaller@techline.com>
> > Cc: John Beckett <landspeedracer@email.msn.com>; land-speed@autox.team.net
> > <land-speed@autox.team.net>
> > Date: Wednesday, November 10, 1999 4:00 PM
> > Subject: Re: Tires
> >
> > >Dave:
> > >i also run Talledegas on the rear. The current set lasted only 4 years
> > >(with very few runs) mainly due to sidewall "cracking" However, they do
> > >exhibit a strange wear patteren; the edges, for about 1.5 inches, appear
> > >to be melted. There is a bluish color that fades to the center of the
> > >tire. You would suspect underinflation, but i run 65 lbs. My local
> > >NASCAR shop said not to exceed that pressure. Do your tires show a
> > >similar wear pattern?. As for handling, the car runs very straight at
> > >200+ so that has not been an issue.
> > >Ed
> > >
> > >David Haller wrote:
> > >>
> > >> Hi John,
> > >> Thanks for the info on the tires. I ran super speedways, 28x15's with a
> > 9"
> > >> tread width this year on the salt. They worked fine, went 201 with them
> > and
> > >> believe I can do alot more. I was told that the wider tread has a
> > tendency
> > >> to cause spins. Does anyone else out there have info on that problem with
> > >> big tires on the salt?
> > >> Thanks,
> > >> Dave Haller #93 C/GALT
> > >> ----- Original Message -----
> > >> From: John Beckett <landspeedracer@email.msn.com>
> > >> To: <land-speed@autox.team.net>
> > >> Sent: Tuesday, November 09, 1999 3:31 PM
> > >> Subject: Tires
> > >>
> > >> > Team
> > >> >
> > >> > Awhile back someone commented on tires at Bonneville. I can't find the
> > old
> > >> > e-mail so I don't remember who it was, but I wanted to add my two
> > cents.
> > >> >
> > >> > Over the years, on my comp coupe, I have run Goodyear NASCAR Daytona's,
> > >> > Goodyear Frontrunners and Mickey Thompson Bonneville tires on the rear.
> > >> Have
> > >> > run them all in the 220 + MPH range. When you discount any potential
> > >> chassis
> > >> > problems, water on the salt, etc. the NASCAR Daytona and the M/T
> > >> Bonneville
> > >> > worked just fine. The Goodyear Frontrunner was down right scary. I most
> > >> > definitely didn't like the 220 + MPH ride, with the tread parting
> > company
> > >> > from the carcass at speed.
> > >> >
> > >> > I believe someone said the wider NASCAR Daytona's won't work on the
> > salt,
> > >> > siting Ron Pruetts BRN article. I would have to disagree, having driven
> > >> with
> > >> > them myself, Gale Banks ran them on his 270 MPH Firebird and even this
> > >> year
> > >> > Calvin Smith ran 260's using the very same tires. Don Stringfellow and
> > >> > others have also run them successfully. They can and do work well. The
> > >> only
> > >> > reason I'm not currently running Daytona's is they wont' fit within the
> > >> > fenders of my Chevette.
> > >> >
> > >> > Another thing to consider here is that, to some extent, the supply of
> > LSR
> > >> > tires is drying up. Example: not to long ago there were about six sizes
> > of
> > >> > M/T tires, now were down to only three. The popular 27.5 x 8-15 is out
> > of
> > >> > production. Who knows what will happen when the other sizes are sold
> > out.
> > >> > Fortunately Goodyear still has some Eagle Land Speed tires (not
> > >> > Frontrunners), but the rating is 300 MPH which won't help Al Teague
> > much.
> > >> >
> > >> > And then there is the tire situation at Maxton. Another story.
> > >> >
> > >> > John Beckett
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
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