[Healeys] Incorrect Speedo Reading

[Ron Mitchell]

I let my GPS do the calculating for me.  Takes less brain cells to know how
fast I am going.

Ron Mitchell




________________________________
From:
Bruce Griffin <bruce_griffin at earthlink.net>
To: "Healeys at autox.team.net"
<Healeys at autox.team.net>
Sent: Thu, May 27, 2010 11:17:02 PM
Subject:
[Healeys] Incorrect Speedo Reading

Gentlemen,

This a very basic question,
but I am hoping for some insight to see if there
is a common Healey reason for
this.

I know my speedo has been bouncing, so I want to replace the cable to
see if
that helps.  My main question is how to estimate my speed based on my
obviously incorrect speedo reading. I checked my speed with another car and
knew it was off. Today, I passed a PD temp. speed camera that displays your
speed. It indicated I was going 40mph, while my speedo showed my speed at
55mph. If I remember my engineering training from college, this is related to
the gear in the transmission and I should be able to adjust my speed by using
the fraction 40/55.  This assumes a portion for correction as opposed to a
simple add 15mph because the gearing of the speedo drive gear is adjusted by a
percentage, not a fixed number.  Any advice appreciated.

This is also a good
math problem for my 11yo son.

Regards,
Bruce D. Griffin
_______________________________________________
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