IC engine with divided combustion chamber - has piston projection to divide chamber into two unequal parts

摘要

The combustion chamber is divided into two unequal parts at piston t. d. c. by a projection (9) formed on the piston crown. The exhaust valve (6) and the spark plug electrodes are located in the smaller of the two part combustion chambers. Ignition takes place in the first chamber (8a). The ensuring flame passes over the piston crown projection as the piston descends to ignite the remaining charge. The combustion chamber volumes can be calculated to give a compression ratio greater than 12:1 in the larger chamber (8b). The smaller combustion chamber vol. is pref. equal to or less than 30% of the combined combustion chamber vol.