Masters Theses


Avinash Singh


"A substantial portion of the input fuel energy in an SI engine is lost towards overcoming the frictional forces from various rubbing parts. These frictional losses are very significant in small engines and these losses can be reduced by incorporating some design changes. A semi-empirical friction prediction model was studied and modified with the help of the experimental results for small SI engines. This model is dependent upon engine geometry and speed. The model divides the frictional work into different sub-assemblies of the engine and these sub-assemblies are in turn divided to determine the friction associated with individual components. A major advantage of this model is that it can predict frictional losses for a particular SI engine just by using its geometry and operating speeds. In addition, this model also accounts for the change in viscosity of the lubricant with respect to varying temperature. The new model will give the designers an overview of the distribution of frictional losses among the different components of the engine. Also, with the help of this information appropriate design changes can be made to reduce engine friction losses"--Abstract, page iii.


Drallmeier, J. A.

Committee Member(s)

Isaac, Kakkattukuzhy M.
Stutts, Daniel S.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering


Missouri University of Science and Technology

Publication Date

Spring 2013


xvi, 82 pages

Note about bibliography

Includes bibliographical references.


© 2013 Avinash Singh, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Tribology -- Computer simulation
Spark ignition engines -- Energy consumption
Friction -- Computer simulation

Thesis Number

T 10303

Electronic OCLC #