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Performance and Cyclic Variability of Natural Gas Fuelled Heavy Duty Engines
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English
Abstract
Two heavy duty turbocharged and aftercooled diesel engines have been converted to spark ignition (SI) for natural gas fuelling. One engine features two valves per cylinder, high primary swirl and a compact combustion chamber. The other engine has four valves per cylinder and a more open combustion chamber shape. Both engines were characterized on a dynamometer and subsequently put into service where one of the engines has been monitored extensively.
When a diesel engine is converted to SI operation, there is an involved process which must be carried out to insure reliable and efficient operation. Many aspects of the conversion process are limited by the original configuration of the diesel engine. Some of these aspects, such as combustion chamber shape, are shown to be important to the optimization of an SI converted engine and are highlighted in the comparison of these two engines.
The conversion process, dynamometer testing and optimization required to bring these engines into reliable fleet service are presented in this paper.
Authors
Citation
Shiells, W., Garcia, P., Chanchaona, S., McFeaters, J. et al., "Performance and Cyclic Variability of Natural Gas Fuelled Heavy Duty Engines," SAE Technical Paper 892137, 1989, https://doi.org/10.4271/892137.Also In
References
- Shiells W. Garcia P. 1988 “Experience with the Operation of Heavy Vehicle Engines Dedicated to the Use of CNG and LPG Fuel,” International Conference-NGV-88 Sydney
- Nakamura N. Baika T. Shibata Y. “Multipoint Spark Ignition for Lean Combustion,” SAE Paper No. 852092 1985
- McFeaters J.S. 1989 ‘An Investigation of the Ricardo E6/T Engine as a Test Bed for Diesel-to-Spark Ignition Conversions’ Ministry of Energy Report No. RD8811
- Matekunas F.A. “Modes and Measures of Cyclic Combustion Variability,” SAE Paper No. 830337 1983
- Heywood J.B. “Internal Combustion Engine Fundamentals,” McGraw Hill New York 1988 413 423