Spark Ignition Engine Tribological and Friction Research

Spark Ignition Engine Tribological and Friction Research

Abstract:
In an attempt to further understand and reduce engine friction, several tribological tests are being prepared. One test will compare the differences between aluminum metal matrix cylinder liners and stock cast iron liners in a six cylinder spark ignition engine. The other test will be to determine the effects of a variety of oils on total engine friction.

Motivation:
Engine friction is the primary difference between the energy input from the fuel and the energy available at the drive shaft of the engine. In an era where fuel conservation is becoming increasingly important, reduction in mechanical friction is an outstanding way to increase fuel economy without sacrificing performance. In fact by decreasing friction, you can increase performance by making more of the fuel’s energy available at the drive shaft. Also by reducing engine friction, you can reduce the size of your cooling and oil systems because a large portion of the frictional losses in an engine appear in the form of heat lost to the coolant and oil.

Researchers:
Chandrasekaran Sethu
Alex Knafl
Stani Bohac
Zoran Filipi
Dennis Assanis

Sponsors:
Automotive Research Center (U.S. Army TACOM)
Lubrizol

Results and Contributions:

Cast iron and aluminum metal matrix cylinder liners (click here for picture of liners)

Effects different oil formulations have on engine friction.

Effects of Oil Properties on Spark-ignition Gasoline Engine Friction (click here)

Engine Oil Effects on the Friction and Emissions of a Light- Duty, 2.2L Direct - Injection - Diesel Engine Part 1- Engine Test Results (click here)