1987-09-01

An Analysis of Lubricating System of Automobile Gasoline Engine 871659

Influences of oil-flow and oil temperature on frictional torques of whole engine and main lubricating components were determined by motoring method. Oil-flow rate, temperature and pressure in main lubricating pathes were directly measured under the same conditions. Oil-flow rate and frictional coefficient of crankshaft system were estimated by theoretically analysing Reynolds’ equation. Experimental data were discussed based on oil-flow analyses in lubricating system. Engine frictional torque becomes smallest when the engine is supplied with an optimum oil-flow rate, 2.5 - 3.5 1/min where the ratio of oil-flow rate is 10 - 20 % in crankshaft system, 30 - 40 % in a piston-connecting rod system, and 50 - 60 % in valve system. The optimum oil-flow rate which minimises the frictional torque is 1 - 2 1/min for crankshaft and piston-connecting rod systems, and 3-4. 1/min for a valve system.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

AVIATION ENGINE DEVELOPMENT

170042

View Details

JOURNAL ARTICLE

Crankshaft and Bearing Analysis Process for a Light Duty Automotive Engine

2008-01-2674

View Details

TECHNICAL PAPER

PIV Characterization of a 4-valve Engine with a Camshaft Profile Switching (CPS) system

2003-01-1803

View Details

X