Ranging God wrote:
I dont know anything about cars.
For a four-stroke engine, key parts of the engine include the crankshaft (purple), one or more camshafts (red and blue) and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system. In both types of engines, there are one or more cylinders (grey and green) and for each cylinder there is a spark plug (darker-grey), a piston (yellow) and a crank (purple). A single sweep of the cylinder by the piston in an upward or downward motion is known as a stroke and the downward stroke that occurs directly after the air-fuel mix passes from the carburetor to the the cylinder, where it is ignited; this is known as a power stroke.
"Internal combustion engine." Wikipedia, The Free Encyclopedia. 17 Apr 2007, 15:28 UTC. Wikimedia Foundation, Inc. 18 Apr 2007 <http://en.wikipedia.org/w/index.php?title=Internal_combustion_engine&oldid=123547895>.
They could explain it better then i could...