A small spark ignition combustion engine (air-cooled, single cylinder, 290 cc-displacement) is operated with a combustible gas, bio-syngas, from the autothermal fixed bed gasifier with Cedar pellet and the cylinder pressure is measured for combustion analysis. The city gas (13A) is used as the reference at the same load. The engine speed is 1,800 rpm. As a result, the thermal efficiency with the bio-syngas is higher than that with 13A. The NOx concentration in the exhaust is less than 100 ppm in any cases. The low averaged cylinder temperature should be the reason.
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