Guhan Srivatsan M.S. defense
Thursday, November 5, 2009, 10:00 AM
EECL building

The Guhan Srivatsan M.S. final defense takes place on Thursday, Nov. 5 from 10 to noon in the EECL Conference Room. The title of the thesis is, "Comparison of Two Stroke Retrofit Technologies."

Advisor: Daniel Olsen, Ph.D.

Committee members: Anthony Marchese, Ph.D., Joe Beebe, Ph.D.

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Abstract of thesis

Two stroke engines are ubiquitous in all developing nations. Their simplicity and rugged nature makes them irreplaceable. The Asian Development Bank estimates that there are about 50 million two stroke engines in Asia.

These vehicles emit the equivalent emissions of about 2.5 billion modern automobiles. This is due to the working of the two stroke engine which make them inherently polluting. The Direct Injection (DI) retrofit developed by Envirofit mitigates the design disadvantage of the Two stroke engine.

The Envirofit’s DI retrofit promises to reduce the hydrocarbon emissions by 88%, carbon monoxide emissions by 72% and also improves the efficiency by about 32%. One more technology that is very popular in these regions is using LPG (Liquefied Petroleum gas) retrofit kits.

These kits promise to reduce the emissions and also there are legislations in certain metropolitan cities in India where they have mandated the use of LPG as fuel in order to reduce the emission levels. Though they would reduce the emissions but due to the working of the Two stroke engine it would still make it environmentally unfriendly.

The comparison made in this thesis tries to compare the different technologies namely Carburetered, Direct injection and Liquefied Petroleum gas in a two stroke engine. The two stroke engine used in the testing used is a Yamaha RS100P engine which is very popular in the Philippines and used as a mode of public transport there.

Also part of this thesis uses software called Virtual Engines to simulate the characteristics of a tuned exhaust system developed for a Two stroke engine. The engine used is a Bajaj engine which is predominant in the Indian sub continent.

The Virtual Engines program takes various engine dimension inputs and based on this it develops the various characteristics of the engine. This software was used to develop a comparison between a normal exhaust system and a tuned exhaust system for the above mentioned engine.

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Event Contact: Denise Morgan can be reached at (970) 491-0924

Sponsored by The Department of Mechanical Engineering.