原文章由 i05172986 於 2011-8-7 01:19 發表 ![T2與目前台灣路上跑的250CC比較1284]()
VTEC in motorcycles
Apart from the Japanese market-only Honda CB400SF Super Four HYPER VTEC,[7] introduced in 1999, the first worldwide implementation of VTEC technology in a motorcycle occurred with the introduction of Honda's VFR800 sportbike in 2002. Similar to the SOHC VTEC-E style, one intake valve remains closed until a threshold of 7000 rpm is reached, then the second valve is opened by an oil-pressure actuated pin. The dwell of the valves remains unchanged, as in the automobile VTEC-E, and little extra power is produced but with a smoothing-out of the torque curve. Critics maintain that VTEC adds little to the VFR experience while increasing the engine's complexity. Honda seemed to agree as their VFR1200, a model announced in October 2009, came to replace the VFR800; which abandons the V-TEC concept in favour of a large capacity narrow-vee "unicam" (i.e. sohc) motor.
It is a version of SOHC VTEC, which was used to increase efficiency at low RPM. At low RPM, one of the two intake valves is only allowed to open a very small amount, increasing the fuel/air atomization in the cylinder and thus allowing a leaner mixture to be used. As the engine's speed increases, both valves are needed to supply sufficient mixture. A sliding pin, which is pressured by oil, as in the regular VTEC, is used to connect both valves together and allows the full opening of the second valve.
這還不足以證明 vtec 是省油裝置?
妳該不會也是天真以為cb400的 vtec 跟汽車的vtec 是一樣的東西
打開vtec像推進器打開哦?
我跟你講沒vtec的高轉車才叫推進器打開啦
[ 本文章最後由 korn911 於 2011-8-7 01:32 編輯 ] |
~ 不必騎車拼性命 
