Good stuff there Dave. As you know, I don't use a push truck
because I have a 2.68 1st gear, and although it is irritating
to the starters, I drive off the line. I do use the clutch
(along with my traction-control right foot) to minimize wheel
spin, but as we have all discussed, each foot not building
speed is a track 1 foot shorter.
---- Original message ----
>Date: Wed, 30 Oct 2002 05:39:08 -0500
>From: Dave Dahlgren <ddahlgren@snet.net>
>Subject: Re: Flywheel Opinion Wanted
>To: Ed Van Scoy <ed@vetteracing.com>
>Cc: Doug Odom <popms@thegrid.net>, land-speed@autox.team.net
>
>If you get a spike in RPM without the same spike in wheel
speed the clutch is
>going.. If they match you spun the drive wheel. It is best to
put a sensor on
>the trans input shaft as it should always read the same as
engine rpm unless the
>clutch is slipping. That way you don't need to do any math as
to what gear you
>are in.
>As far as the heavy flywheel goes I just never add weight to
anything unless it
>can be proved to help me. The same thing that might help a
heavy wheel not slip
>the tires has to work in reverse as well once they start to
spin. If it doesn't
>work in both directions I suspect the theory is wrong. I
would think that the 11
>inch dual disk clutch is the same weight as a button clutch
on a heavy wheel as
>well. So to stay the same with a small clutch i would think
you would have to
>add to the flywheel. For Bonneville I would also think that a
clutch that can be
>slipped a tiny bit at the start is a real advantage to
leaving gracefully at the
>start. I don't think the button clutch likes that one bit. It
is either in or
>out you pick which one but there is very little in between.
>Dave
>
>Ed Van Scoy wrote:
>>
>> Doug;
>> 11.5" McCloud dual disk. Russ mentioned datalogging..... I
>> noticed a number of "spikes" all through high gear from last
>> El Mirage & assumed it was just wheelspin from a torn up
>> course. Same spikes at 1st run at WF.... It was trying to tell
>> me the clutch was slipping. When it went, the 2nd disc from
>> the flywheel disintigrated. The rest of the clutch looks just
>> great, so it was just a routine racing failure.
>> Ed
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