作者: phantompower ( 鬼才) 站內: LION
標題: [閒聊] 恢復動力的快感
時間: 2011/09/24 Sat 23:16:25

哈哈哈，這種感覺真是太爽太難以形容了，比放榜考上還爽。
油門輕輕抓一點就衝了，順順的滑上60km/h，典型2T的輕快感回來了。
而且放油門會溜很遠了，比4T還大的可怕檔煞終於消失，好像附在車子的鬼怪被驅離。
最棒的是跑24公里路油表還沒有掉耶(這不是很平常嗎?)
但之前是加滿騎回家就油往下掉，氣死人的油耗<19km/L。
感謝volvo辛苦一整天，沒吃午餐又害閃光蹲路邊餵蚊子換來的成果，感謝感謝!!
結論是：沒事不要亂改曲軸大包，曲軸減少的容積是要經過推算的，不是全部填住就好了
，且必須進排氣系統伴隨修正，才能得到最佳化，相關論文請參:
the effect of crankcase volume and the inlet system
on the delivery ratio of two-stroke cycle engines
author:Fujio Nagao , Yuzuru Shimamoto

abstract
IN ORDER TO IMPROVE ENGINE PERFORMANCE, increasing
the air charge is most important. The air charge of the crank-
case scavenged two-stroke cycle engine is particularly sen-
sitive to pressure fluctuations in the exhaust and inlet sys-
tems because of the small pressure differences available for
scavenging che cylinder. To date, the results of manyfluc-
tuation studies have been published (1-9)* and the optimum
ming conditions of the inlet and exhaust pipes have been
solved both theoretically and experimentally. It is a well-
known fact that the air charge can easily be made larger
than the piston displacement by pipe tuning. However, the
dimensions of the exhaust and inlet systems, which are de-
igned without regard to utilization of the pressure fluctua-
tions, are not always suitable for full utilization. Since the
air charge is increased by the pressure difference, it is nec-
essary t o consider not only matching the frequency of fluc-
tuation to the engine speed, but also to the time-area  of
rhe ports and the flow resistance of the inlet and exhaustsys-
tems.
By changing the crankcase volume and lengths of the ex-
haust and inlet pipes, the authors have experimentally in-
vestigated the effect of the crankcase volume on the delivery
ratio, and the effect of exhaust and inlet systems to com-
pensate for the drop in delivery ratio caused by increasing
the crankcase volume. Further experiments have been car-
ried out to find the conditions under which both the tuned
exhaust and inlet systems are most effectively utilized for
increasing the delivery ratio.

--
 ╭┼ Origin:  玩車人的天地 ˙東吳機研站  scumotor.com.tw 
 ┼╯ Author: phantompower 從 122-120-65-182.dynamic.hinet.net 發表
→ TheCrossRoad 推：恭喜！ 不過我低檔時的檔煞也很難受...              11/09/25
→ TheCrossRoad 推：害我低速過彎的時候都會習慣半離合                  11/09/25
→ auxo 推：幾時改大包的啊？                                          11/09/25
→ phantompower 推：小敖sorry!這台不是雄獅，是台鈴的2T125塑膠車       11/09/26
→ auxo 推：贏將？                                                    11/09/26
→ airfox 推：樓上正解～                                              11/10/18