This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Effect of Fuel Dissolved in Crankcase Oil on Engine-Out Hydrocarbon Emissions from a Spark-Ignited Engine
Annotation ability available
Sector:
Language:
English
Abstract
A single-cylinder, spark-ignited engine was run on a certification test gasoline to saturate the oil in the sump with fuel through exposure to blow-by gas. The sump volume was large relative to production engines making its absorption-desorption time constant long relative to the experimental time. The engine was motored at 1500 RPM, 90° C coolant and oil temperature, and 0.43 bar MAP without fuel flow. Exhaust HC concentrations were measured by on-line FID and GC analysis. The total motoring HC emissions were 150 ppmC1; the HC species distribution was heavily weighted to the low-volatility components in the gasoline. No high volatility components were visible. The engine was then fired on isooctane fuel at the above conditions, producing a total engine-out HC emission of 2300 ppmC1 for Φ = 1.0 and MBT spark timing. The heavy end components observed during motoring were still present, but their mole fractions decreased by approximately a factor of 5.5±1 relative to the motoring HC emissions. The contribution of crankcase-derived HC emissions is estimated to be approximately 1.5±0.5% of the total HC emissions during steady-state, fully warmed-up operation of this engine on gasoline fuel.
Recommended Content
Authors
Citation
Kaiser, E., Siegl, W., and Russ, S., "Effect of Fuel Dissolved in Crankcase Oil on Engine-Out Hydrocarbon Emissions from a Spark-Ignited Engine," SAE Technical Paper 972891, 1997, https://doi.org/10.4271/972891.Also In
References
- Kaiser, E. W., Siegl, W. O., and Russ, S. G. “Fuel Composition Effects on Hydrocarbon Emissions - Is Fuel Absorption in Oil Significant?” SAE Technical Paper No. 952542 (1995).
- Norris, M. G., and Hochgreb, S. “Extent of Oxidation of Hydrocarbons Desorbing from the Lubricant Oil Layer in Spark-Ignition Engines,” SAE Technical Paper No. 960069 (1996).
- Russ, S., Kaiser, E. W., and Siegl, W. O. “Effect of Cylinder Head and Engine Block Temperature on HC Emissions from a Single Cylinder Spark Ignition Engine,” SAE Technical Paper No. 952536 (1995).
- Russ, S. G., Kaiser, E. W., Siegl, W. O., Podsiadlik, D. H., and Barrett, K. M. “The Effect of Air/Fuel Ratio on Wide open Throttle HC Emissions from a Spark Ignition Engine,” SAE Technical Paper 941961 (1994).
- Kaiser, E. W., Siegl, W. O., Cotton, D. F., and Anderson, R. W. “The Effect of Fuel Structure on Emissions from a Spark-Ignited Engine,” Environmental Science and Technology 27, 1440 (1993).