Hey, Pup...

In your post you state There is just one small problem with your calculation, a 4 stroke completes takes only two cycles, not four to complete the process

OK, there is a reason why 4-cycle, and 4 stroke are interchangeable.
Suck - Squeeze - Bang - Blow
One, two, three, four.

Two stroke, or two cycle, up - down. Done.

Where do you think that 4 = 2 ???
I would fire your math instructor.
He said 4-stroke, not 4-revolutions.

Bob