Abstract: An inertia flywheel assembly for a dynamometer is portable and provides for accurate testing of the performance of automotive vehicles. In a motorcycle application a flywheel (15) is mounted between swing arms (14) and supported on axle (18) by eccentric adjusting spacers (22), support section (20), and flywheel bearings (21). The flywheel (15) is driven by the motorcycle drive chain (13) and drive sprocket (12). Flywheel speed and acceleration data is provided to the dynamometer by flywheel sensor (27). The motorcycle can be started using starter motor (24). The flywheel assembly is supported by support structure (16) and is portable using transport wheels (17).

Abstract: A dynamically variable exhaust system provides for maximum efficiency of an internal combustion engine (30) by including an exhaust control device (35) which is operated by a control mechanism (33) and managed by a control unit (32). The length and cross-sectional area of the exhaust header section (36) can be varied by transversely displacing the effective exhaust passage within control device (35) while maintaining a streamlined profile of the effective passage throughout a predetermined range of displacement. The control unit (32) can be influenced by numerous operational inputs including control device position potentiometer (40), engine speed input (41), engine load input (42), vehicle braking sensor (43), exhaust emission and temperature sensor (44), and engine management system input (45).

Abstract: An exhaust system for a two-cycle internal combustion engine provides for maximum efficiency of the engine by displacing the baffle member to vary the effective volume of baffle chamber. Additionally, a method is provided for producing maximum engine power over a wide range of engine speeds by returning high amplitude pulses to the exhaust port at the correct timing for various speeds.