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Development of a 2-cylinder uneven firing engine from a 4-cylinder parent engine is associated with variation in air mass flow due to the combined effects of both engine downsizing as well the large firing gap between the cylinders especially 540°. This affects the turbocharger performance & durability and engine emissions due to fluctuations in the air mass flow. This paper investigates the effects of engine geometries such as stroke, valve overlap, cam profiles, intake and exhaust manifold configuration and surge tank effect through one-dimensional thermodynamic simulations and experimental tests, thus reducing the pulsation effect by 85%. Two engine configurations - naturally aspirated engine for 15 kVA power rating and turbocharged version for 30 kVA power rating were considered for the development study.

Diesel engines are primarily being used for Power Generation due to its higher thermal efficiency and its superior fuel consumption compared to gasoline engines. Due to the growing awareness of environment protection and producing eco-friendly products, government agencies throughout the world have started introducing legislations which would limit the emissions produced by engines and would help in resolving the cause for cleaner and greener environment. In similar lines, Central Pollution Control Board (CPCB) has proposed to introduce the next stage of stringent emission norms for engines used in Power Generation by April 2014 which are comparable to the best in the world. This paper deals with the strategies applied and experimental results for meeting the proposed CPCB-II norms.