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An experimental investigation of the PJC (Pulsed Jet Combustion) system in a research engine is presented. The modus operandi is based on the introduction into the combustion chamber of a turbulent plume formed by a jet of rich combustion products issued from an orifice of a generator plug. This study is a continuation of previous investigations performed with the use of, sequentially, a constant volume vessel and a single compression machine. The PJC generator was supplied with a rich mixture via a Bosch injector. Methane was used as a fuel. Pressure records of a piezo-electric transducer were processed by a computer data acquisition system. The investigations were performed for lean combustible mixtures (ϕ=0.625, 1.0) over a wide range of spark advance angles. Direct comparison between the PJC system and conventional spark ignition was made for optimal ignition advance angle.