[Mg-t] TC speedo in a TD

[mgbob at juno.com]

Hi Bob,
  I make the assumption that 1675 is turns of the cable per mile.
  You can probably do the maths to solve for speed with variables of
wheel&tire diameter, or circumference, and gear ratios, etc, but I think that
it would be more practical to run a measured mile or to use a GPS.
  I have the formula somewhere for wheel&tire circumference, gear ratios, etc.
let me know if you would like to try it.
  Oh, another factor--on the TDs  and TFs where we have used the formula, we
found the speedos were all a bit faster than calculated. Perhaps a bit of
Safety Faster....
Bob
---------- Original Message ----------
From: "Bob Donahue" <bobmgtd at comcast.net>
To: "mg-t" <mg-t at autox.team.net>
Subject: [Mg-t] TC speedo in a TD
Date: Sun, 5 Aug 2012 15:04:06 -0400

I just discovered that the Jaeger speedometer in my TD came from a TC. The
number is "S461 1675". Can anyone tell me what the error in speed and miles
is?

Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd at comcast.net
Cars:       52 MGTD - #17639
               71 MGB - #GHN5UB254361
Member:  NEMGTR #11470
               NAMGBR # 7-3336
               Hoosier MGB Club
               Olde Octagons of Indiana
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