Regarding the lakester with some cord and blistering showing. The question
is was this one run or several runs on the tires. Over the years I have seen
many tires with this condition and even know for a fact that Al Teague has
trimmed off a few strands of cord with a razor blade to make a high speed
return run.Some times all it not what it seems.
Glen
----- Original Message -----
From: "rtmack" <RTMACK@pop3.concentric.net>
To: "Skip Higginbotham" <saltrat@pro-blend.com>
Cc: "rtmack" <RTMACK@concentric.net>; <land-speed@autox.team.net>
Sent: Saturday, December 01, 2001 10:33 AM
Subject: Re: Tire reliabilty, and traction control
> Skip:
> There may be some cases of tire failure that are purely a function of
overload--
> God knows some of our racers manage to load the hell out of them. But you
were the
> first one who told me (before I had ever turned a wrench on "the Rose")
that many
> of the fastest LSR cars had to deal with about "15% wheelspin". I don't
understand
> why you are saying something different now. And based on my own
examination (and,
> admittedly marginal expertise)-- I believe that the drive tires on the
very fast
> lakester pitted near us showed evidence of spinning. There were abrasion
marks,
> for one thing-- and some cord showing through where the surface had
abraded away.
> Abrasion marks come from spinning the tires. There was also a little
blistering,
> and bare places where it appeared that blisters had popped-off. As you
know,
> blisters come from heat. Heat (usually) comes from spinning the tires.
We know
> that that car seems to have the ability to really load the drive tires--
so
> overload may have been a contributing factor (as it may have been in Earl
Wooden's
> case)-- but seeing the tire abraded down to the cord suggests to me that
the main
> factor is probably wheelspin.
> Yes, it would be better to get the opinion of a real expert, rather than
just
> exchanging opposing hot rodder opinions. Shouldn't be hard to find
someone with
> sufficient expertise in tire failure modes and post-failure analysis. I
probably
> bump into one or two at any CART race I work. Can we get a representative
sample
> of (recently) failed tire carcasses? If so, I would be willing to try to
recruit
> an appropriate expert to our cause.
>
> There is nothing here that I see as a valid arguement why racers in
non-vintage
> classes should not be allowed to use TC, if they want to.
> Russ
>
>
> Skip Higginbotham wrote:
>
> > Russ,
> > So how about some failure analysis? How can we do that? Others have had
> > tire failures that have not gone 300 even....this year....on new tires.
> > Excessive loading and load deflection? I think it is a real possibility
> > that needs proving or disproving. I think we will find little or no tire
> > slippage and yet tires coming apart. How about it?
> > Skip
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