I.c. engine charge tumble intake system

摘要

The charge intake passage 31 has a straight portion 33 whose centre line is approximately parallel to the face of at least the exhaust valve for generating a tumble charge flow in the cylinder 40. A valve 27 associated with a partition wall 26 in the intake passage 31 may prevent flow in a region of the passage at light engine loads to increase the tumble at low charge flows. The charge control valve (27a, Figs. 4 to 6) may take various forms. The angle ( theta 1, Fig. 2) which the roof (41b) of the combustion chamber containing the intake valve makes with the cylinder axis (42) may be less than that ( theta 2) made by the roof 41a containing the exhaust valve. The engine may have intake passage or direct into the cylinder fuel injection.