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Influence of Low Lead Fuels on Exhaust Valve Performance
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English
Abstract
An extensive series of tests has been completed to evaluate accelerated exhaust valve seat wear which occurs in passenger car engines with lead-free gasoline. Results indicate that the predominate factor contributing to seat recession is vibration induced relative motion between the valve and seat. Engine speed rather than load or temperature showed the greatest influence on accelerated wear. Various combinations of valve head shape including changes in seat angle, seat width, and valve head stiffness were studied. Fixed versus rotated valves, various valve materials, and face coatings and fuel additive evaluations also were made. Reduced valve seat angles and hardened seats showed the greatest reduction in valve seat wear with lead-free gasoline.
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Citation
Giles, W. and Updike, S., "Influence of Low Lead Fuels on Exhaust Valve Performance," SAE Technical Paper 710674, 1971, https://doi.org/10.4271/710674.Also In
References
- Giles W. S. “Valve Problems With Lead Free Gasoline.” Paper 710368 SAE Mississippi Valley Section Davenport, Iowa October 1970
- Godfrey D. Courtney R. L. “Investigation of the Mechanism of Exhaust Valve Seat Wear in Engines Run on Unleaded Gasoline.” Paper 710356 SAE Automotive Engineering Congress Detroit January 1971
- Zinner K. “Investigations Concerning Wear of Inlet Valve Seats in Diesel Engines.” ASME 63-0GP-1 Oil and Gas Power Conference St. Louis, Missouri May 1963