在175F涡流预燃室风冷柴油机的基础上更换气缸盖、活塞等零件，改成新的175F直喷式燃烧室风冷柴油机。
Based on the 175F type swirlprechamber air cooling diesel engine, through redesigning cylinder head and piston etc. , new 175F type direct injection air cooling diesel engine is formed.
活塞顶部可以做成平的、凹的、凸的或是能够促进涡流帮助燃烧的任何形状。
It may be flat, concave, and convex or any one of a great variety of shapes to promote turbulence or help control combustion.
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