[Mgs] Calibrating the MGA tach

[Barney Gaylord]

At 05:34 PM 5/4/2008 -0400, W. David Houser wrote:
>....
>"I want to know what the ratio is from the camshaft to the tach.
>Actually, how many revs of the flex shaft correspond to, say, 100 RPM.
>....

Crankshaft to camshaft is 1/2 reduction.
Camshaft to tach drive is 5/6 reduction.
Overall reduction is 1/2 x 5/6 = 5/12  (0.417/1).
Tack drive runs 417 turns per 1000 crankshaft revolutions.

Barney Gaylord
1958 MGA with an attitude
http://MGAguru.com