Experimental data obtained in a single-cylinder, variable compression ratio, spark ignition (SI), cooperative fuel research (CFR) engine when operating on CH4, H2, CO, simulated reforming product gas (2H2 + CO), and some of their mixtures are presented. The dependence of the value of some key operational and combustion variables, including the knock and lean operational limits, combustion duration, and exhaust emission on fuel composition, is investigated. The significant effect of the presence of H-bearing species such as CH4, H2, or H2O on the combustion and knock characteristics of dry CO is also highlighted. Guidelines as to the suitability of these fuels for SI engine applications are provided.
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