Date:         Sat, 5 Aug 2006 11:38:18 -0700
Reply-To:     Rich Bennington <rich.bennington@CHARTER.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Rich Bennington <rich.bennington@CHARTER.NET>
Subject:      Re: Reasonable cruising speed?
Comments: To: Loren Busch <starwagen@gmail.com>
In-Reply-To:  <86476e250608040827idd338f8o74cd6815b14cb239@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

<________________________________________
From: Loren Busch [mailto:starwagen@gmail.com] 
Sent: Friday, August 04, 2006 8:27 AM
To: Rich Bennington
Cc: vanagon@gerry.vanagon.com
Subject: Re: [VANAGON] Reasonable cruising speed?

 RE: The speedometer and odometer are fed separately.
Actually, they are both fed from the same source, the speedometer cable. 
But the odometer is a direct physical connection to the cable.  The
speedometer dial that you can see is driven/moved by induction through a
spinning magnet inside an aluminum cup, consequently the speedometer can
vary, no direct connection.  The odometer is counting the turns of the wheel
in the case of the 2wd Vanagon and the inaccuracy can only come from tire
diameter being different from the factory spec and not turning at 805
revolutions per mile.
I happen to be lucky, my odometer and speedometer are in very close sync,
both read about 2% high based on measured mile courses on the highway.  BTW,
although my GPS seems to provide accurate speed, it ends up way off on
distance, usually many miles low over a couple of hundred miles.
>

Oops!  Sorry, I was thinking of the place where the oxy sensor mileage
counter splits off of the speedo cable.  Of course there is only one
connection to the cluster!  Duh!

Still, it’s not uncommon for the ODO and speedo to be different, due to
either an offset on the needle on the speedo, or a weak spring, or both.
Interesting about the GPS – I suspected the GPS update time may affect the
distance measurements, especially when going fast, but I never tested it
like you did.

Rich