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Speedos

To: british-cars@encore.com (British Cars Mailing List)
Subject: Speedos
From: "Darrell Walker" <walker@hprpcd.rose.hp.com>
Date: Tue, 12 Feb 91 12:35:26 PST
 
> > ????????????? how ???????????
> > one turn of a sticky cable is still one turn.
> > A sticky cable can cause a speedo to "bounce"
> > but the cable will not turn faster.
 
What may happen is that the binding cable will cause cycles of fast and
slow revs, as the cable twists enough to overcome whatever is binding it.
While this may cause the needle to bounce, if the frequency is correct it
can result it a higher reading, due to the speedos tendency to "average"
out the bounces.  If you think about it, that is how a speedometer works,
the spinning cable causes pulses on the needle that are counter-acted by
a spring pulling the needle back.
 
--
   Darrell Walker                 walker@hprpcd.hp.com
   (916) 785-4059                 HPDesk: walker (hprpcd) /HP5200/UX 



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