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knock-knock:
Spark Knock, Wild Ping, or Rumble?
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English
Abstract
ENGINE noise has become an increasing problem with the higher and higher compression ratios of present-day automotive engines. Because fuel octane number cannot be raised indefinitely, the problem is one of engine design and selection of crankcase lubricating oils and gasoline formulations, the authors think.
This paper describes investigations into the cause of spark knock, wild ping, rumble, and the added problem of hot-spot surface ignition (which also intensifies as compression ratios increase). The authors have found gasolines with phosphorous additives, used with properly formulated multiviscosity lubricating oils, provide a partial answer to the problem of engine rumble.
The authors conclude that very exact tailoring of fuels, lubricants, additives, and engines will be necessary to prevent engine noise if compression ratios continue to rise.
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Citation
Perry, R. and Lowther, H., "Also In
References
- “Looking Ahead in Fuels for Automotive Transportation,” Campbell. J. M. Horning Memorial Lecture 1957 SAE SP 216
- SAE Transactions Vol. 63 1955 132 144 “Designing New Performance into a Special Motor Oil,” Raymond L. Socolofsky. J. F.
- “New Engine Analyzer,” Martin E. A. Goffe. J. H. Paper presented at SAE Summer Meeting Atlantic City June 1954
- “New Engines Demand Tailored Spark Plugs,” Teasel. R. C. Paper presented at SAE Mid-Continent Section Meeting Tulsa October 1956
- “Spark Plug Fouling: A Survey — Test Procedures — Fuel Factors,” Hall, G. A. Beaubier, R. C. Marckwardt, E. C. Courtney. R. L. Paper presented at SAE Annual Meeting Detroit January 1957