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The results of research work on unsupercharged and turbocharged V-type engines with natural gas fuelling systemhave been presented in the paper. For lower emission the original gas supply system has been designed which ensuresvery proper control of air-fuel ratio in both cylinder banks. It was stated, that lowering the emission needs very precisecontrol of gas-air ratio, application of lean mixture on partial loads, control of turbocharging and appropriate choice ofconverters with palladium catalytic coach.

The analysis of ways to ensure low emission (methane inclusive) from natural gas fuelled engines