对新的柴油机在气缸盖侧壁、中隔板、进排气道以及气门方面的改进进行了介绍。
The improvements of new diesel engines in terms of cylinder head side walls, middle walls, inlet and exhaust passages and valves were presented.
采用穗流试验的方法测定492汽油机进排气系统的阻力(包括进排气管和气缸盖进排气道)。
The inlet and exhaust systems (including inlet and exhaust manifolds and ports of cylinder head) resistance of model 492 gasoline engine have been measured by the steady flow tests.
进、排气道是汽车发动机的关键部件之一。
Intake and exhaust port are the key parts for the mobile engine.
研究认为，柴油机气缸盖进、排气道脉纹的产生主要是由硅砂高温发生相变膨胀导致砂芯开裂引起的。
Research has believed that veining in admission and exhaust passage of diesel engine cylinder head may mainly be caused by crack of sand core occurring in high temperature phase change expansion.
通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
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