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Motorcycle is the most popular transportation means in Vietnam due to its low cost and flexibility. However, motorcycles emit substantial quantities of hydrocarbons, carbon monoxide, nitrogen oxides and some amount of particulate matter. Emission factors for in-use motorcycles in Vietnam were studied and established quite a long time ago. The objective of this study is to update the emission factors, not only gaseous emissions but also particle number, for in-use motorcycles in Vietnam. Ten carbureted and electronic fuel injected motorcycles representative for in-use motorcycles were selected for investigation. Each motorcycle was fueled by conventional gasoline, E5 and E10 in turn, and was tested on a chassis dynamometer according to ECE R40 driving cycle. The gaseous emissions were sampled and determined by standard methods, while the particle number in exhaust gas was sampled by using the sampling system developed by Laboratory of Internal Combustion Engine, Hanoi University of Science and Technology, Vietnam. The updated emission factors were then provided for carbureted motorcycles, EFI motorcycles and average motorcycle fleet in case of gasoline, E5 and E10 fueling.

The use of ethanol/gasoline blends on gasoline engines is not only a potential solution for satisfying the fuel demand but also for reducing emissions from vehicles which cause environmental pollution and adverse health effect. In Vietnam, the blend with 5% of ethanol (E5) has been widely used. However, blends with higher than 5% of ethanol should be studied and applied in order to improve the ability to substitute for gasoline. This paper presents the experimental results of in-use carbureted and fuel injected passenger cars fueled by gasoline RON92, E10, E15 and E20. These cars were tested at the steady state as well as following the ECE15+EUDC driving cycle. Results indicated the different influence of these ethanol/gasoline blends on power, fuel consumption and emissions of the cars.

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