id	keyword
fumecheng-13259	engine
fumecheng-13259	piston
fumecheng-13259	combustion
fumecheng-13259	efficiency
fumecheng-13259	fig
fumecheng-13259	ratio
fumecheng-13259	stroke
fumecheng-13259	compression
fumecheng-13259	concept
fumecheng-13259	internal
fumecheng-13259	valve
fumecheng-13259	motion
fumecheng-13259	speeds