Forums!
Difference between me and Barry is I am right he is WRONG!
I get paid to teach people for a living!
He comes to forums cause no one will pay him to teach people
You can bury your head in the sand as much as you like, if you cant accept equivalence or know what an internal combustion cycle is or how all elements of an engine are accounted for then there is not much hope left for you to learn. It is not a hard concept, for some though I agree its a mountain v's for others a mole hill.
Good luck to you, one day you will learn something, I suggest you go to school and spend less time on the internet.