必须仔细选择空气起动系统部件，包括油箱、阀门、软管和起动机，以便在系统适用的最恶劣气候条件下提供起动发动机所需的速度。发动机起动负载随着低温而增加，因此，这些部件的初始选择需要考虑低温发动机扭矩要求。为了确保获得足够的空气起动系统，重要的是使用适当的测试程序来获得发动机的起动负载要求。

The air cranking system components, which include the tank, valve, hose, and starter, must be carefully selected to provide the necessary speed to start an engine under the most severe climatic conditions for which the system is intended. Engine cranking loads increase with cold temperatures, therefore, the initial selection of these components, needs to consider low-temperature engine torque requirements. To insure an adequate air cranking system is obtained, it is important that proper test procedures are used for obtaining the cranking load requirements of the engine.