>Date: Wed, 16 Sep 1998 19:19:11 -0500
>From: "Harlan Jillson" <hjillson@argolink.net>
>Subject: Re: RPMs
>The speedometer on the other hand is a mechanically
>driven device running off of the gearing in the transmission. The speedo
>should read correctly if there isn't a problem with the drive cable, lack
>of lubrication, frayed wire in the cable etc. that would cause the cable
>to bind in its rotation, which would usually cause the speedo to 'jump'
>around.
After you get past the mechanical drive of the speedo, the cable ends with a
spinning magnet that attracts the cup on the back of the needle to indicate
the correct speed. If the needle and magnet aren't aligned correctly, or if,
after many years of high speed fun, the magnet starts to lose its strength,
you will get false readings from a speedo, altho usually low readings. If the
speedo were completely mechanical with the cable driving the needle, wouldn't
the needle just spinnnnnnnnnnn!?! (FWIW)
Allen Hefner
Honesty is the best politics. (Stan Laurel)
|