... improved exhaust gas housing assembly；改进的排气壳总成 improved exhaust pipe；改进的排气管 improved filtration；改善的滤清[渗透]性 ...
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而优化设计的排气管和改进的计时器和活塞也有助于提高效率。
A better design for the exhaust pipes adds to the efficiency, along with modified timing and pistons.
主要介绍8170zc系列柴油机排气管的改进过程，并对几种排气管的性能进行对比。
The article mainly introduces the improvement process of 8170zc diesel engine exhaust manifold and compares the 8170zc exhaust manifold with other exhaust manifolds.
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