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Engine Experiments on the Effects of Design and Operational Parameters on Piston Secondary Motion and Piston Slap
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English
Abstract
Experiments were done to quantify the dynamic motion of the piston and oil-film during piston impact on the cylinder bore, commonly known as “piston slap.” Parameters measured include engine block vibration, piston-skirt to liner separation, oil-film thickness between the piston and liner, and other engine operating conditions. Experimental parametric studies were performed covering the following: engine operating parameters - spark timing, liner temperature, oil-film thickness, oil type, and engine speed; and engine design parameters - piston-skirt surface waviness, piston-skirt/cylinder-liner clearance, and wrist-pin offset.
Two dynamic modes of piston-motion-induced vibration were observed, and effects of changes in engine operating and design parameters were investigated for both types of slap. It was evident that engine design parameters have stronger effects on piston slap intensity, with piston-skirt/liner clearance and wrist-pin offset being the dominant parameters. However, for given engine and component geometries, slap intensity was significantly affected by lubricant properties.
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Authors
- James P. Ryan - Massachusetts Institute of Technology
- Victor W. Wong - Massachusetts Institute of Technology
- Richard H. Lyon - Massachusetts Institute of Technology
- David P. Hoult - Massachusetts Institute of Technology
- Yoshiki Sekiya - Nissan Motor Co.
- Yoichi Kobayashi - Nissan Motor Co.
- Shunichi Aoyama - Nissan Motor Co.
Topic
Citation
Ryan, J., Wong, V., Lyon, R., Hoult, D. et al., "Engine Experiments on the Effects of Design and Operational Parameters on Piston Secondary Motion and Piston Slap," SAE Technical Paper 940695, 1994, https://doi.org/10.4271/940695.Also In
New Developments in Engine Design and Engine Component Technology
Number: SP-1017; Published: 1994-03-01
Number: SP-1017; Published: 1994-03-01
References
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