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B Sankar Mandal (35), a mechanic from Kokrajhar, has modified the auto engine incorporating a process to pre-heat the incoming air for complete combustion of the fuel. This has resulted in significant improvement in the mileage. The innovation is a modification of an auto rickshaw engine assembly. In the modified system, a part of the exhaust gas is utilized to heat the incoming air while the remaining part is utilized to heat the mixture containing both the air and fuel before the entry to the engine. This is to ensure the complete combustion of the fuel, which results in increased fuel efficiency. The heat from exhaust gas is utilized to warm the intake air by means of a heat exchanger having surface contact with the silencer pipe. Some exhaust gas is channelized to the carburettor section, which is used to heat the air fuel mixture using another heat exchanger. Besides the cylinder valve has also been modified in a manifold way so as to ensure that the air fuel mixture does not move out from the cylinder.
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