最近本田公司推出了强动力性的X4型摩托车如图1所示,它采用1300 mL大排量水冷直列四缸DOHC型发动机,在低速时可产生更大的转矩。 X4真正诱人之处是具有压倒优势的动力性能,其发动机的开发主导思路是“低速转矩充足”,所以X4具有绝对顶尖的起动加速性能,虽摩托车和骑乘者加在一起的质量超 Recently, Honda introduced the X4-type motorcycle with strong motivity as shown in Figure 1, which uses a 1300 mL large displacement water-cooled in-line four-cylinder DOHC engine to generate more torque at low speeds. The real attraction of the X4 is its overwhelming power performance. The engine’s development is dominated by “low speed torque,” so the X4 has absolutely top starting acceleration performance, although the mass of the motorcycle and rider together ultra