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Knock characteristics of commercial LPG, with 83…87% propane and 9…15% alkenes have been investigated in a spark ignition engine for heavy duty vehicles. While knock characteristics of propane have been already studied, it was considered that there is at present a lack of information concerning a possible synergistic interaction in the end gas of propane with the alkenes, the second important component of LPG. Different conclusions existing on some issues, like the correlation between knock intensity and knock onset time on an individual cycle basis, emphasizing our insufficiencies in information, were also suggestive for our study. At last, special problems resulting from the need to make best use of the recorded pressure data, like the best way to isolating the high frequency component, were also addressed.