There are some different ways of arranging porting for the four-valve diesel engine, such as two helical intake ports, two tangential intake ports or one helical port and one tangential port etc.
四气门柴油机进气道可以选用不同类型的进气道进行组合，如二个螺旋进气道、二个切向进气道或一个切向进气道一个螺旋进气道等。
There are some different ways of arranging porting for the four-valve diesel engine, such as two helical intake ports, two tangential intake ports or one helical port and one tangential port etc.
四气门柴油机进气道可以选用不同类型的进气道进行组合，如二个螺旋进气道、二个切向进气道或一个切向进气道一个螺旋进气道等。
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