Effect of some lubricant and engine variables on instantaneous piston and ring assembly friction
The Instantaneous IMEP method has been used to measure piston and ring assembly friction in a production Chevrolet 1.8 litre L-4 and a 5 litre V-8 engine modified for single-cylinder operation. Friction measurements are reported at different loads and speeds up to 1640 RPM under firing and motoring conditions with various oils and before and after break-in of the oil ring. Oils used were SAE viscosity grades 30, 50 and 30 with a friction modifier. Differences were found between motoring and firing friction, especially on the power and exhaust strokes. These differences diminished at higher speeds and lower loads where lubrication was more hydrodynamic. Differences in response to viscosity and friction modifier changes were noted between the two engines.
- OSTI ID:
- 5856102
- Report Number(s):
- TP-840178
- Country of Publication:
- United States
- Language:
- English
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330101* -- Internal Combustion Engines-- Spark-Ignition
COMPARATIVE EVALUATIONS
DYNAMIC LOADS
ENGINES
FLUID MECHANICS
FRICTION
HEAT ENGINES
HYDRODYNAMICS
INTERNAL COMBUSTION ENGINES
LUBRICANTS
LUBRICATING OILS
LUBRICATION
MEASURING METHODS
MECHANICS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PERFORMANCE TESTING
PETROLEUM PRODUCTS
PISTONS
RINGS
SPARK IGNITION ENGINES
TESTING
TRIBOLOGY
VISCOSITY