'Morning flood. Why not learn something today? Or better yet teach someone something new! I'm at work so what better to teach than PISTON ENGINES. -piston engines operate in one of two modes, 2 stroke or 4 stroke configurations. -the easiest way to remember the operation of an engine is <suck, squeeze, bang, blow -this also applies to turbine engines, though different in nature, due to lack of a crankshaft. -2 stroke engines are known for higher RPM operation and 4 stroke engines are known for their outstanding torque, especially at mid to lower RPM ranges. Questions? Boom! You're smarter already. Now, teach me something!