After • Air • Allow • Allows • Burned • Chamber • Combustion • Compress • Compression • Cooling • Cycle • Does • Downward • During • Engine • Exhaust • Exhaustion • Exit • Firing • First • Four • From • Fuel • Gases • Generate • Generates • Heat • Ignites • Ignition • Induction • Intake • Into • Mixture • Move • Name • Occurs • Out • Piston • Plug • Power • Process • Push • Removes • Spark • Stroke • Supplies • Throttle • Upward • Valve • Which