ME107B_3 IC Engine

Scott Moura, Jennifer Hisoire, Daniel Hon, Kenny Langston, Tuthien Le, Matthew Rosenbrock, Timothy So
May 1, 2006

Mechanical Engineering Laboratory (ME 107B)
Sang Park (Graduate Student Instructor)
UC Berkeley
Internal combustion engines provide an extremely significant role in our lives. They help us commute to work, transport goods across the ocean, farm crops, and build homes to name a few examples. As a result, it is of paramount importance to our society that we understand how an engine works. This laboratory investigation is designed to examine the operation of an internal combustion (IC) engine and what factors affect its overall performance. Data is collected from a 1986 Pontiac 4-cylinder engine in order to ascertain the effects or changing throttle position, engine speed, spark timing, and disengaging the turbocharger. Our objective is to determine the optimum operating conditions for power, torque, efficiency, and emissions. Through this process, cycle efficiency is characterized by relating the actual cycle to the ideal Otto Cycle. In addition, thermodynamics and PV diagrams are utilized to determine power and energy distribution. Basic combustion theory is applied in order to determine the effects on emissions of changing operating conditions. Finally, numerical data analysis and modeling techniques are applied to simulate the engine’s torque output given a set of operating conditions. Consequently, the performance and air pollution characteristics of an internal combustion engine will be quantified and qualified.