The research and analysis of the in-cylinder flow fields in a four valve engine under the motored condition have been carried out.

在倒拖工况下对四气门发动机气缸内流场进行了实验研究和分析。

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In addition, the measurement on pressure loss cross one side of four-way diverter valve has been carried out and some questions on pressure loss of four-way diverter valve are posed.

同时，也对四通换向阀进行了单侧压力损失测量，对四通换向阀说明书上的压力损失参数的准确性提出了质疑。

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To change this four-way valve will only take five minutes.

换这个四通凡尔只需要五分钟。

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Under the Hood: A new 2.4 literDOHC 16-valve inline four that makes 185 hp.

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The 4.3-liter, four-cam, 32-valve V8 engine can race from zero to 60 mph in a respectable 5.9 seconds (the same as the V8 7-Series), throwing out 290 horsepower and 320 pound-feet of torque at 3, 400 rpm.

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Known for its four-stroke 90-degree V-twin engines and its unique valve design, Ducati has carved out an impressive racing record, highlighted by its 2007 Grand Prix World Championship win.

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