Browse Publications Technical Papers 922374
1992-10-01

An Experimental Study of Oil Consumption in Gasoline Engines 922374

The purpose of this experimental study was to investigate the relative influence of the physical characteristics of monograde and multigrade lubricants on engine oil consumption, taking into account different engines and different operating conditions. A bench test program on FIAT FIRE 1000 and BMW S14 gasoline engines was carried out using an automatic oil consumption measuring equipment.
The interaction between simulated driving conditions (highway, hill-road) and oil consumption was studied using lubricants differing in volatility and rheology: the results showed the importance of volatility in limiting oil consumption; the influence of viscosity was more complex, as it depends on the engine; the role of VII polymers was also pointed out. The hill-road for FIAT and the highway for BMW were identified as the most severe driving conditions.
Moreover the dependence of oil consumption on engine running conditions was investigated in detail, obtaining a map of oil consumption as a function of speed and intake manifold vacuum: a different behaviour was observed for both engines thus indicating BMW as more critical regarding oil consumption through the oil ring package, and FIAT as more critical regarding oil consumption through the valve seals.
The role of the valve seals in limiting oil consumption was also examined on FIAT: the presence of both exhaust and intake valve seals was confirmed as really important for oil consumption control under every running condition and even after extended running times.
Formulas were established on the basis of the experimental results relating oil consumption to the volatility and rheological properties of the lubricant.
During the whole experimental study, both the test engines were run for almost a thousand hours, thus giving the oil consumption trend during the engine life.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
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

Factors Influencing Engine Oil Consumption in Today's Automotive Engines

892159

View Details

JOURNAL ARTICLE

Evaluating the Induction System Deposit Tendencies: Bench Technique

2010-01-1467

View Details

TECHNICAL PAPER

Reduction of Friction Loss through the Use of Rolling Big-End Bearings

951793

View Details

X