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An Experimental Single Cylinder “ECCLINK” VCR Engine
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English
Abstract
The improvement in both performance and thermal efficiency of internal combustion engines at higher compression ratios is a well known phenomena. Indeed, a simple Otto Cycle analysis show a potential efficiency improvement of 13% by increasing the compression ratio from 9:1 to 15:1. However, the dilemma for engineers has always been in the realization of a practical operational mechanism.
This paper describes the ECCLINK VCR mechanism which enables compression ratio to be altered within given limits on a running engine. A single cylinder 500 cm3 four-stroke research engine, incorporating the ECCLINK mechanism, has been built and tested. Results are presented at both full load and part load over a range of compression ratios, showing improvements in performance and fuel economy. Of particular interest is the fact that full load bsfc improvements equate to typical Otto cycle values.
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Citation
Douglas, R., Currie, J., Chopra, A., and Ma, T., "An Experimental Single Cylinder “ECCLINK” VCR Engine," SAE Technical Paper 921695, 1992, https://doi.org/10.4271/921695.Also In
References
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