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Application of a Simple Mechanical Phasing Mechanism for Independent Adjustment of Valves in a Pushrod Engine
Technical Paper
2003-01-0037
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A dual independent valve phasing mechanism is applied to an air-cooled, pushrod actuated, V-twin motorcycle engine with two cams. As described, the mechanism is manually adjusted. The design is readily adapted to automated control.
The phasing concept mounts the roller lifter in an eccentric sleeve. Rotation of the sleeve advances or retards the position of the roller lifter relative to the cam lobe. This action in turn advances or retards valve timing. Valve lift and duration are essentially unaffected.
Predicted and experimental results from varying valve phase under idle, part load, and full load conditions are presented. The effect of valve overlap on hydrocarbon emissions at idle and NOx emissions at part load are described. Changes in volumetric efficiency and torque at wide-open throttle operation are also described.
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Citation
Riley, M., Troxler, P., Hull, W., and Willson, B., "Application of a Simple Mechanical Phasing Mechanism for Independent Adjustment of Valves in a Pushrod Engine," SAE Technical Paper 2003-01-0037, 2003, https://doi.org/10.4271/2003-01-0037.Also In
References
- Grohn M. “The New Camshaft Adjustment System by Mercedes-Benz - Design and Application in 4 -Valve Engines” SAE Paper 901727 1990
- Steinberg R. et al “A Fully Continuous Variable Cam Timing Concept for Intake and Exhaust Phasing” SAE Paper No. 980767 1998
- Moriya Y. et al “A Newly Developed Intelligent Variable Valve Timing System - Continuously Controlled Cam Phasing as Applied to a New 3 Liter Inline 6 Engine” SAE Paper No. 960579 1996
- Mechadyne International http://www.mechadyne.co.uk
- GMInsidenews http://www.gminsidenews.com/xv82.htm
- Kramer U. Phlips P. “Phasing Strategy for an Engine with Twin Variable Cam Timing” SAE Paper No. 2002-01-1101
- Ahmad T. Theobald M. A. “A Survey of Variable-Valve-Actuation Technology SAE Paper No. 891674
- Leone T.G. Christenson E. J. Stein R. A. “Comparison of Variable Camshaft Timing Strategies at Part Load” SAE Paper No. 960584 1996
- U.S. Patent number 6,155,216