starts with the piston at the top of the cylinder ... the combustion products are expelled from the cylinder. The sequence shown on the next page represents this behavior for a Mitsubishi direct ...

The exhaust stroke is the fourth and last one in the cycle: the piston moves up to TDC, pushing burnt gases out of the cylinder. This is commonly how modern combustion engines work. Some engines ...

In the video after the break, [Brick Technology] uses LEGO to gain some practical insight into the world of piston engine design, from single-cylinder all the way up to radial twelve-cylinder engines.