[Healeys] Power band of two different motors, or is it the rear end?

[jstmorris at yahoo.com (J. Scott Morris)]

Here is a quick table that outlines the difference in performance of varying
differential gearing.  Hopefully it will come through in relatively readable
form.
 
Crown /               Ratio                
Performance                      Performance
Pinion                 _____               Improvement_____          
Description41 / 10                  4.100                   100.0 %     
4.9 %            quick starting43 / 11                  3.909                 
-    4.7 %     100.0 %            all around39 / 11                  3.545
         -  13.5 %     -   9.3 %            cruising & good gas mileage.
 
A taller rear-end is a higher gear ratio which is a smaller ratio number; i.e.
3.545 is a taller rear-end than a 3.909.
 
Also attached for you Jerry is an Excel spread sheet in which you only have to
input your rear-end and overdrive information to determine the theoretical
performance differences.
 
Enjoy!!
 
--Scott Morris; Simcoe, Ontario, Canada                - Keep Smiling, Murphy
Lives

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