The Hindu : Kerala / Thiruvananthapuram News : Team finetunes two-stroke engine

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Team finetunes two-stroke engine

Staff Reporter

New ideas: The team which developed a technology to reduce pollution and improve mileage for two-stroke engines.

THIRUVANANTHAPURAM: A group of six final year students of mechanical engineering at Mary Matha College of Engineering and Technology, Paliode, have put together a fuel-injection mechanism for a two-stroke petrol engine.

The team L. R. Amjith, Nishanth Sasidharan, Pradeep R. Nair, H.T. Sivadas, A.S. Unnikrishnan and R. Unnikrishnan — claims that the technology will help reduce by half the pollution caused by a two-stroke engine while effecting an increase in mileage of 30 per cent.

Fuel loss minimised

The team got down to work using a 1995 model Suzuki Samurai, a 100 cc bike with a two-stroke engine. The team designed a fuel-injection system for the engine using the transfer port fuel injection method. Here the injector is fitted at the transfer port and the fuel is injected when the transfer port is about to close. Thus fuel lost through the exhaust is reduced.

An Electronic Control Unit controls the supply of fuel to the injector.

The team placed a crank position sensor on the flywheel. This supplies information to the ECU, which decides how much fuel is needed for combustion at a given time. Two types of injectors were used -- mechanical and electronic.

A fuel pump delivers pressurised fuel to the electronic injector, controlled by ECU. As per signals from ECU the electronic injector delivers fuel to the mechanical injector, mounted on the transfer port. The combustion takes place inside the cylinder.

“We proved that fuel injection is possible in two-stroke engines and that combustion can be sustained for long,” a note by the team read.

The advantage of the transfer port injection method over the direct injection of fuel is that the former allows time for the proper mixing of air and fuel.

The stress on the injector can also be reduced. This ensures longevity of the injector. The team took four months and spent Rs.35,000 to develop this.

Berlin Selva Rex at the Mary Matha College was the team’s guide. Technical assistance was received from Chitra Kumar, lecturer of mechanical engineering at the SCT College of Engineering, and from Ajith of Aji workshop at Valiyavila, the note added.

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