If you are dumping mechanical energy directly to the crankshaft, what are you doing?
Answer: Driving the #$^& wheels. Or if it is a plane, you are driving the prop.
Just read the wiki article like I said.
Your compressing air and dumping into the intake. period.
It's not a jet engine, it's a piston engine.
and look at that wiki page, and read it yourself. see the pic? thats a Nomad engine. See that pointy thing after the turbo? thats the air intake for the compressor side of the unit.