If the diesel engine has a superior economic performance, a dependable work, and if the noise and the vibration can be controlled in a lower limit, which usually depends upon its valve train system.

• 一台柴油机的经济性能是否优越,工作是否可靠,噪音与振动能否控制在较低的限度,常常与其配气机构的设计是否合理有密切关系。