Abstract. The objective of this study is to investigate the stability of lightweight motorcycle in straight path running test. The stability of three different tyre dimensions was measured using acceleration, angular velocity and vehicle speed signals from smartphone sensors. The signals were analysed to determine whether standard configuration of tyres used in lightweight motorcycles in various developing countries are safe in terms of vehicle stability. In order to identify effects of tyre width on driving stability, forward speed, angular acceleration and rotational velocity were measured. These measurements are valuable empirical data in the understanding of motorcycle balance mechanism. Results of analysis show that for the range of tyre width 70 mm to 110 mm for the front and 80 mm to 120 mm for the rear wheel used in the test, motorcycle stability is not affected by the tyre width for the straight path run with maximum speed of 60 km/h.
This paper presents the effect of using a modified air pump to compress the mixture of air and biogas into a single cylinder diesel engine. The crankshafts of both were modified such that two equal size sprockets could be fastened to them. A toothed belt was used to synchronize the crank positions of the pump and diesel engine. By adjusting the angular positions of the crankshaft of the pump at 205 degrees in advance compared to the angular positions of the crankshaft of the diesel engine, the maximum volumetric efficiency of 99.95% could be achieved at 1200 rpm. And when supplementing diesel fuel with biogas via the large venturi, the consumption of 50 cc. of diesel extended to 194.18% at 1200 rpm as compared to running the engine with 50 cc. of diesel alone.
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