>Also, driving style is a contributing factor to excessive tire wear
>regardless of the surface type. Almost every McKamey School graduate has
>noticed a significant improvement in tire wear because they are a smoother
>driver than before.
Possibly true (didn't notice any appreciable difference myself), but that
doesn't apply to Don's numbers, since they represent the same un-McKamey'd
driver inputs. The percentages should still be the same.
KeS
>Donald R McKenna wrote:
> >
> > Too all:
> >
> > I've commented on the great "first-effort" job Kieth and Nanda did
>Saturday,
> > 5-20. However there is some food for thought, to be absorbed from our
> > experience, about course layout/length and it's impact on tire wear at
> > 3-Com.
> >
> > The length of the course (in time), yesterday, and the many, low speed,
> > tight corners really increased tire wear per run. Although 3-Com is,
> > technically, asphalt, it is quite abrasive due to the type of slurry
>coat.
> > My tire wear measurement numbers, over the years, indicate that the
>3-Com
> > lot is the most abrasive lot we use following McClellan cement and the
> > Castle cement site. By comparison Stockton wear is about 2/3 that of
>3-Com
> > and Mather wear is less than half. The old Oakland surface , before the
>new
> > slurry (for which I don't yet have creditable numbers), was our
>lowest-wear
> > site, slightly better than Mather.
> >
> > Before yesterday's event, we'd run 2900 seconds (60 runs @ 48 sec) on
>our
> > tires on various surfaces (2 at Mather, 2 at Stockton, 1 at new-Oakland,
>1
> > at Laguna and 2 at 3-Com)
> >
> > The bottom line of this comment is that we ran tires with only 58% of
>the
> > tread worn before the event and corded 3 of 4 on Saturday. If you ignore
>the
> > tread rubber under the grooves, before you hit cord, the last 42% of
>tread
> > was worn off in 13 runs totaling 1080 seconds.
> >
> > Do the arithmetic, 18% of our runs used 42+% of the tires. At that rate
>we'd
> > get an average of 9, 4 run, entries per set of $900 tires.
> >
> > The message here is: In the future, don't plan to run long and tight
>corner
> > courses on agressive surfaces like 3-Com, it's too expensive!!!
> >
> > Don
>
>--
>Kenneth Allan Mitchell
>mailto:nokones@ix.netcom.com
>
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