Rings for automotive engine usually have butt joints, but in some heavy-duty engines, the joints may be angled, lapped, or of the sealed type.

汽车发动机上的活塞环通常是有接口的。但在一些重型发动机上，活塞环的接口可以是斜角接口，搭接式或密封式的。

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It's the most advanced heavy-duty engine oil yet developed by Shell and provides high protection even at the low-viscosity levels required for optimal fuel economy.

这是最先进的重型发动机油尚未开发的壳牌公司，并提供高度保护，甚至在低粘度所需的水平最佳的燃油经济性。

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With the numerical simulation of heavy-duty diesel engine to strengthen performance, a CAD assembly model of cylinder head bolt is built based on the thread.

结合大功率柴油机性能强化的数值计算，在考虑螺纹的基础上建立了气缸盖螺栓的CAD装配体模型；

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Its main business is Guangxi Yuchai Machinery Company, which is one of the largest medium-duty diesel engine manufacturers in China.

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One thing hasn't: Cummins Engine, the world's biggest maker of heavy-duty diesel engines, still doesn't make money.

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