In this paper the experimental results of spark ignited (SI) engine fuelled with lean mixture of simulated producer
gas compared with chosen gaseous fuels are presented. The SI engine test fuelled with simulated producer gas,
natural gas and simulated biogas with variable value of excess air ratio has been done. The experiments were carried
out on the petrol engine with a low engine displacement. Typical SI engine was selected in order to evaluate the
potential application of gaseous fuel (i.e. producer gas, natural gas or biogas). These types of engines are available
on a wide scale and commonly used in automotive sector because of the low purchase price and operating costs. It is
expected that after minor modifications, the engine can easily operate in micro CHP system. The main goal of this
work is to determine the performance of the engine and its impact on the environment during the combustion of the
lean producer gas mixtures. The study shows the impact of both the excess air ratio and the type of fuel used for
engine performance and emission index. Combustion of lean mixtures of producer gas leads to an increase of carbon
monoxide in the exhaust. Increasing the value of excess air ratio affects the growth of indicated efficiency of the
engine
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