Originally Posted by FlexyTJ
One last diesel noob question- the running backwards thing can only happen with a two stroke, I'm ASS-uming?
Pretty much. Remember, the Detroit only has traditional intake valves, and bleeds exhaust out the side of the cylinder through ports. Every time the piston goes up, you've got air compressed and a shot of fuel from the injector to go bang. In a traditional 4 stroke you would be on exhaust... but that already happened on the bottom of the stroke as did fresh air incoming in a 2 stroke.
Here's what the sleeve looks like: