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The Effect of Some Fuel and Operating Parameters on Exhaust Valve Seat Wear
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English
Abstract
We are currently faced with the possibility of operating millions of passenger cars and trucks on gasolines free of lead whereas they were designed to operate with leaded gasoline. The studies discussed in this paper illustrate the potential engine damage in the form of exhaust-valve seat wear that could result from such a move. This work shows that the inclusion of phosphorus in zero-lead gasoline is not a complete solution to the exhaust-valve seat wear problem, but that as little as 0.5 gm of lead per gallon in gasoline can provide complete exhaust-valve seat wear protection under relatively severe conditions of speed and load.
Comparison of photomicrographs of exhaust valves and exhaust valve seats run with zero-lead and 0.5 gm leaded gasolines permits speculation on the mechanism responsible for exhaust valve seat wear in engines fueled with zero-lead gasoline.
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Authors
Citation
Kent, W. and Finnigan, F., "The Effect of Some Fuel and Operating Parameters on Exhaust Valve Seat Wear," SAE Technical Paper 710673, 1971, https://doi.org/10.4271/710673.Also In
References
- Wiles H. M. “Gas Engine Valve and Seat Wear.” “Engineering Know-How in Engine Design-Part 13,” New York Society of Automotive Engineers, Inc. 1965 paper 650393
- Floyd C.M. “Factors Affecting Valve Life in Gas Engines.” Paper No. 63-WA-321 ASTM Winter Annual Meeting Philadelphia November 1963
- Cherrie J. M. “Factors Influencing Valve Temperatures in Passenger Car Engines.” Paper 650484 SAE Mid-Year Meeting Chicago May 1965
- O'Neill D. “Swtich to Unleaded Fuels Offers Benefits, Poses Problems,” Jnl Automotive Engineering 78 August 1970
- Giles W. S. “Valve Problems with Lead-Free Gasolines.” Paper 710368 SAE Mid-Year Meeting Montreal June 1971
- Godfrey Douglas Courtney Richard “Investigation of the Mechanism of Exhaust Valve Seat Wear in Engines Run on Unleaded Gasoline.” Paper 710356 SAE Automotive Engineering Congress Detroit January 1971
- American Society for Metals “Metals Handbook,” 8th 1 1961 491