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Effect of Secondary Air Injection in Redesigned Exhaust Pipe of Two-Stroke Internal Combustion Engine

Harshad Fargade


The emission produced by two-stroke internal combustion engine is not under the limits of vehicle emission norms mentioned by pollution department. An experimental study was performed for more fundamental understanding of effect of secondary air injection on exhaust emissions of two-stroke cycle engine during cold starting period by redesigning the exhaust pipe. The pressurized secondary air is injected in the newly designed exhaust pipe near the exhaust port with the help of separate single cylinder two-stage compressor and nozzle. The effects of different operating conditions were investigated. The amount of HC, CO and CO2 measured with the help of exhaust gas analyzer. The study found that significant reduction in exhaust unburnt HC and CO due to injection of pressurized atmospheric air in redesigned exhaust pipe. The change in design of exhaust pipe with secondary air injection reduced HC, CO and CO2 emissions by 62.77%, 39.285% and 17.129% respectively in idling condition. In full acceleration condition, HC, CO and CO2 emissions reduced by 70.12%, 72.17% and 9.52%, respectively.

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D. Lee, J. Heywood. Effects of secondary air injection during cold start of SI engines, SAE Int J Engines. 2010; 3(2): 182–96p.

M. Crane, R. Thring, D. Podnar, L. Dodge. Reduced cold-start emissions using rapid exhaust port oxidation (REPO) in a spark-ignition engine, SAE Technical Paper 970264. 1997.

K.P. Coffin. Effect of timed secondary-air injection on automotive emissions, NASA Technical Memorandum NASA TM X-2737. 1973.

M. Kochs, M. Kloda, G. van de Venne, J. Golden. Innovative secondary air injection systems, SAE Tech Paper. 2001-01-0658

PIERBURG [SI 0106] MS Motor service international Gmbh-0510 EN.

J. Pritchard, W.K. Cheng. Effects of secondary air on the exhaust oxidation of particulate matters, SAE Technical Paper. 2015-01-0886.

J. Kedaria, S.B. Bhatt. Experiment investigation on pollution control by air injection system to catalyst for oxidation process, Int J Adv Eng Technol. 2013, 39–40p. E-ISSN 0976-3945.

M. Borland, F. Zhao. Application of secondary air injection for simultaneously reducing converter-in emissions and improving catalyst light-off performance, SAE Technical Paper 2002-01-2803. 2002.

K. Nishizawa, T. Yamada, Y. Ishizuka, T. Inoue. Technologies for reducing cold-start emissions of V6 ULEV’s, SAE Technical Paper 971022. 1997.

R.B. Poola, R. Sekar. Study of using oxygen-enriched combustion air for locomotive diesel engines, CONF-961017-7 ANL/ES/CP-90529. 1996.

H. Watson, E. Milkins, G. Rigby. A new look at oxygen enrichment 1) the diesel engine, SAE Technical Paper 900344. 1990.


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