The friction of a 1. 6 litre automotive engine-Gasoline and diesel

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5575024

Ball, W F; Jackson, N S; Pilley, A D; Porter, B C

The important influence of engine friction on fuel economy has aroused new interest in its accurate measurement. Ricardo have developed a new system of instrumentation capable of measuring mechanical friction under any steady engine running conditions, and isolating the proportion of engine power absorbed by each of the auxiliary drives. Furthermore, auxiliary drive torque is measured instantaneously as a function of crank angle, enabling the dynamics of the drives to be studied. The instrumentation can be easily adapted to fit most engine types and configurations whilst retaining the original auxiliary drive design. Results obtained from gasoline and diesel versions of a 1.6 litre automotive engine using this instrumentation are described. Mechanical friction, pumping losses and auxiliary drive losses were measured with engine load, speed and coolant temperature varied. Camshaft drive torques as a function of crank angle are compared to predictions, and the effects of valve springs with reduced load are shown. Significant friction differences were found between motoring and firing conditions. The distributions of losses in the gasoline and diesel engines are compared.

• OSTI ID: 5575024
• Report Number(s): CONF-860263-
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
ABSTRACTS
COMPARATIVE EVALUATIONS
COOLANTS
DIESEL ENGINES
DOCUMENT TYPES
DYNAMIC LOADS
DYNAMICS
ENERGY LOSSES
ENGINES
FRICTION
FUEL ECONOMY
FUELS
GASOLINE
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
LEADING ABSTRACT
LIQUID FUELS
LOSSES
MEASURING INSTRUMENTS
MECHANICS
MEETINGS
MODIFICATIONS
PETROLEUM PRODUCTS
PUMPING
SPARK IGNITION ENGINES
STEADY-STATE CONDITIONS
TEMPERATURE EFFECTS
TORQUE
TRIBOLOGY
VELOCITY