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Development of 4-stroke Engine for Small Motorcycle with Low Fuel Consumption and High Performance for Brazil

Article of Honda R&D Technical Review Vol.16 No.2

Summary

A 4-stroke, 150 cm3 engine that satisfied both of low fuel consumption and drivability was developed for Brazilian market. For decreasing the fuel consumption, quick burnning was attempted by employing a tumble-port, and leaner air-fuel ratio than the former model was enabled. In order to decrease the engine friction, a thin oil ring and a cam follower with a roller bearing was employed. Engine output at low and middle engine speed was enhanced and high gear ratio was enabled. This reduced the fuel consumption at the same vehicle speed. As a result, compared to the former 125 cm3 models, the fuel economy at ECE-40 mode was enhanced by 18% despite increased displacement to 150 cm3, and the maximum output was increased by 18%. Engine output at low and middle engine speed was enhanced by 37%. Emission level of EURO-2 was attained without any devices such as secondary air induction. In addition, vibration was decreased with a primary balancer.

Reference

(1) Nakajima, Y., Muranaka, S.: Chapter 2, Nenpi no Koujo, Kaitei Jidousha Gasorin Enjin, Tokyo, Sankaido (2001) (in Japanese)
(2) Hayashi, A., Takabayashi, T., Sakurahara, K., Endo, T.: Development of Lean-burn Engine for “ACCORD/TORNEO”, HONDA R&D Technical Review, Vol. 10, p. 49-57
(3) Sawamura, Y., Saito, N., Sakamoto, B., Kobayashi, H., Hirose, Y.: Development of a 4-stroke Engine for Small Motorcycle with Low Fuel Consumption and Low Emission for Thailand, Honda R&D Technical Review, Vol. 15, No. 1, p. 77-82

Author (organization or company)

Yuichi TAWARADA(Asaka R&D Center)、Takashi KANBE(Asaka R&D Center)、Yukihiro YASUDA(Asaka R&D Center)、Hiroyuki YABE(Asaka R&D Center)、Hidemi YOKOYAMA(Asaka R&D Center)

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