Not to be argumentative but it is the piston moving upward in the cylinder that forces the exhaust gas to exit the cylinder and begin its journey through the exhaust system. The heat still has nothing to do with it. ~Michael
Heat has EVERYTHING to do with it, because if the heat didn't expand the air-fuel mixture when it ignites, there would be no pressure to push the piston down... (no power) and the amount of gasses coming out the exhaust manifold would just be equal to the amount of air going into the cylinder. A turbo couldn't work.
Yes, the piston on its way up the cylinder, pushes the exhaust out, but the exhaust is still expanding (that's why turbos glow cherry red when in operation under load,) and that still-burning gas expands the air further and helps create the pressure that spins the turbo impeller.
I'm no engineer either, but that is my opinion... LOL!
You know what they say about that (opinions)...:happy1:
