Does the compression of the motor play any type of role in injector duty cycle?

yes ,the lower the comp higher the duty ,but I might be wrong.,

yes ,the lower the comp higher the duty ,but I might be wrong.,

Seems like that theory would be opposite. Anyone else?

Does the compression of the motor play any type of role in injector duty cycle?

I'm guessing you mean compression ratio? It may or may not, and if so, indirectly. With a higher CR, you may want to run richer, which in turn would increase your duty cycle, etc.