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This paper analyzes the potential problems in the exploitation of the older   generation of spark-ignition engines with higher octane number of petrol   (unleaded petrol BMB 95) than required (leaded petrol MB 86). Within the   experimental tests on two different engines (STEYR-PUCH model 712 and GAZ 41)   by applying piezoelectric pressure sensors integrated with the engine spark   plugs, acceleration sensors (accelerometers) and special electronic block   connected with distributor, show that the cumulative first and second   theoretical phase of combustion when petrol of higher octane number (BMB 95)   is used lasts slightly longer than when the low-octane petrol MB 86 is used.   For new petrol (BMB 95) higher optimal angles of pre-ignition have been   determined by which better performances of the engine are achieved without a   danger of the combustion with detonation (also called knocking)

Research of combustion in older generation spark-ignition engines in the condition of use leaded and unleaded petrol