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This paper is intended to evaluate the engine performance indirectly through the engine cylinder vibration analysis based on the combustion excitation. The diesel based excitation which is considered the threshold for comparison is evaluated to compare it with the combustion propensity of the new combo fuel. The vibration recordings have been collected on the cylinder head, piston slap and the foundation of the engine to analyze them in the form log-log FFT plots and time waves which amply estimate the combustion propensity with alternate fuel replacing totally the diesel fuel. In parallel, the combustion pressures have also been measured with the engine data logger which collects the pressure data from the pressure transducer and the crank angle encoder and synthesizes them to present it in the form of log-log FFT plots using off line Vast –an software. The pressure plots and the time waves generated by the vibration analyzer are collated to understand the engine combustion phenomena in a lucid way. Finally after tallying, it is understood that the combustion with the new fuel (Beef Tallow methyl ester with 2% hydrated ethyl alcohol) is suitable for replacement of the petro diesel with the renewable fuel. Keywords—Beef Tallow Methyl Ester (BTME); Indirect Injection (IDI) diesel engine; Vibrations; Electronically controlled secondary fuel injection; Hydrated ethanol; Combustion analysis.

Combustion related vibration analysis of supercharged IDI diesel engine using beef tallow methyl ester with hydrated ethanol as an additive