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Sorry for the delay, but you can see that I was occupied with the intellectual pursuits above.
The Wright-Pat museum has a booklet from 1919 that shows original curves and those of modified rotaries. It is under "cam modifications". As I remember, it is excerpted from SAE proceedings from 1919...(I did the research over 40 years ago and memories dim with the passage of time.)Contact the librarian/curator, who will explain how ;you can check this out by mail.
Actually, I may have a copy of this in my pile of literature, so if I find it I will get back to you.
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