This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of Elliptical Piston Engine for Motorcycle
Annotation ability available
Sector:
Language:
English
Abstract
Honda developed a 750cm3 V-4 engine adopting an elliptical piston, and began selling the “NR” motorcycle with the engine installed in 1992. The adoption of an elliptical piston and cylinder achieved a compact layout of eight valves, which consists of four intake valves and four exhaust valves per cylinder. This paper explains the features of an engine with such a layout, focusing on the following:
- 1)Multiple valves and short-stroke enable the 750cm3 engine to achieve 15,000rpm.
- 2)The engine is more compact and lightweight than an engine having the same displacement, and more powerful than one with twice as many cylinders (8 cylinders).
Also, this paper describes the techniques giving improved blowby gas and oil consumption characteristics as related to the sealing property of the piston, cylinder and piston ring and achieving performance equivalent to a conventional motorcycle engine.
Recommended Content
| Technical Paper | Compressed Air as a Quality and Pollution Free Fuel Substitute in Reciprocating Engines |
| Technical Paper | Dynamic Exhaust Valve Flow 1-D Modelling During Blowdown Conditions |
Authors
Citation
Kanazawa, S., Akagi, M., Fukamachi, M., and Suzuki, M., "Development of Elliptical Piston Engine for Motorcycle," SAE Technical Paper 930224, 1993, https://doi.org/10.4271/930224.Also In
References
- Fukui T. Satoh I. Nishiyama R. “Realization of High-performance Motorcycle Engine ∼8-valve System Racing Engine∼” Journal of Society of Automotive Engineers of Japan 39 9 1985
- Yagi S. Fujiwara K. Kuroki N. “Estimate of Total Engine Loss and Engine Output in Four Stroke S.I. Engines” SAE paper 910347 1991
- Yoshida H. Kusama K. Sagawa J. “Effects of Surface Treatments on Piston Ring Friction Force and Wear” SAE paper 900589 1990