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A small single cylinder 4 stroke gasoline engine varying capacity from 100cc to 500cc generally used for two wheelers has a wide range of load conditions. Such variation in load on engine demands variation in Transmission ratio at different vehicle speeds for optimum performance, drivability and Economy. A scooter has continuously variable transmission called as CVT which is generally centrifugally controlled with respect to engine speed as against that of series of manual gears used in motor cycle. The work aims at creating a mathematical model for controlling variation in transmission ratio of CVT by converting the generally centrifugally controlled CVT by electronic control. The objective is to implement the mathematical model with a novel electronic controlled CVT in a two wheeler engine for the improvement in performance. The mathematical model done through geometric calculations and modeling is discussed in details.

A small single cylinder 4 stroke gasoline engine varying capacity from 100cc to 1000cc generally used for two wheelers has a wide range of engine speeds during operation and may vary from 1000 RPM to 10000 RPM. Such variation in speed of engine demands variation in the valve timing and lift of engine at different speeds for optimum performance. The work aims at improving the performance of single cylinder two wheeler gasoline engine. The objective is to implement the novel variable valve timing and lift mechanism in the two wheeler single cylinder 4 stroke gasoline engine for the improvement in performance. The system design through kinematic calculations and 3D modeling, the prototyping with assembly, the functioning of system and its effect on the performance of engine are discussed in details. Valve timing and lift optimization was done using 1D simulation for performance prediction.