Search Results

This paper describes the technical data on the development of rotary engine, Model RE-5 which is designed to power motorcycle, and has a piston displacement of 497 cc in a single rotor. During the process of development, a number of problems such as combustion variation on low-load, cracking of the stationary gear, oil consumption and etc. were solved. Moreover, we made a success of discovering most suited structure of plug located on the trailing side to prevent fouling and preignition.

The CAD/CAM system, named “SCADEM-2”, in Suzuki Motor Co., Ltd. Motorcycle Engineering Division was developed, based on the old system “SCADEM”. 3D CAD/CAM system “SCADEM-2” is more accessible for operating, more speedy for processing and more complete for generating figures than the old system. Since this system opened in 1987, has been popularly used by most designers of Motorcycle Engineering Division. It's main functions are Design (3D), Drafting (2D), Electrical Schematic, and FEM Processing.

Motorcycles arrange the radiator in front of the engine. So, the size of radiator is not wider than the width of engine or the width of frame. We design the motorcycle similar to road-racer. We hope that the width of radiator is as narrow as possible, because motorcycle can run as fast as possible. So, it is necessary that the width of engine and frame is narrow as much as we can, and the width of radiator is limited. But for the water-cooled engine, the temperature of coolant has better be low so as to product the effective combustion. So, it is necessary that the width of radiator has better be wide, but it contradict the above. “U-Shaped Radiator” solves the above problem. The structure is that radiator bends U-form in the front of motorcycle. Now we can improve the cooling performance (+30%) in comparison with the same width radiator.

To improve performance of motorcycle 4 cycle 250 cc engine, we examined the following. (1) We improved crank balance so that friction loss of crank shaft was reduced. (2) We reduced air intake resistance and improved exhaust system so that volumetric efficiency was increased. (3) We reduced weight of valve system parts so that maximum RPM was increased. As these improvement, we have achieved 33.1 kw/15000 RPM and torque increase in low and middle RPM range for motorcycle 250 cc engine on 1989 year model.