On Wed, Jun 14 Darryl Coppenhaver wrote:
>So how do I tell me gear ratio any-way?
The author of the article I mentioned (printed in the Sunbeam Alpine Owners
Club Members Handbook) anticipated this question and included a method to
determine the differential ratio. Here goes:
"To check which differential your Alpine is actually fitted with, jack up one
rear wheel (chock the other one well), put the car in top gear and use the
starting handle to bring the engine to top-dead-center (watch the timing
marks). Now mark the bottom center of the tire whilst holding the wheel back
against transmission backlash. Turn the engine over two complete turns to
exactly T.D.C. again and, holding the wheel back against the backlash once
more, see how far the wheel has rotated.
If you have a 3.89:1 differential the wheel should have done just over one
complete turn and if you have a 4.22:1 differential it should have done less
than one turn. The exact angles for these differentials and others that can
be fitted to Alpines are listed below.
Differential Ratio Wheel Rotation
4.86:1 296x
4.78:1 301x
4.55:1 316x
4.44:1 324x
4.22:1 341x
3.89:1 370x
3.70:1 389x"
I have not yet tried this myself, but I do have a starting handle. However,
I tried to hook it up one day and it doesn't line up with the crankshaft
pully. I think the bumper or valence was in the way.
If you try this I would be interested in the results.
Terry Edlund
San Diego, CA
B395009965
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