D1146/D1146TI/DE08TIS MAINTENANCE MANUAL 1.2. Engine Specific Character 1.2.1. Toroidal combustion mode (D1146) The D1146 engine is operated in the toroidal combustion mode that was developed by this company with AVL Co. Australia. The feature of this mode in the fundamental structure is that there are combustion chambers in the centers of piston heads and swirling passages in the cylinder heads.
This swirling passages when intake stroke generates the strong swirling motion in the combustion chambers by giving the intake air a big moment, and when compression stroke, the special piston’s shapes causing very complicated and distorted flows by means of eddy current and squashed flows will make the air and fuel mix more smoothly. Also, when explosion stroke, a considerable output increase came to be expected with the accomplishment of nearly perfect combustion by the more smooth mixing of air and fuel which was injected through multi-nozzles in the combustion chamber.
This engine by means of Toroidal Combustion Mode has the specific character such as quiet and stable revolutional motion, multi-purpose application, economical fuel and oil consumption, etc. 1.2.2. OMEGA combustion bowl (D1146TI, DE08TIS) The OMEGA combustion bowl is a unit designed M1041A to perform high efficiency, low emission combustion. As the rim around the combustion bowl port of the upper of the piston has been machined in a smaller size than the interior of the combustion bowl, strong swirl is produced in the combustion bowl and strong squish flow makes the fuel be mixed more sufficiently with air.
Due to the application of OMEGA combustion system and optimal utilization of intake and exhaust port configuration within the cylinder discharge very low level of hazardous exhaust head, the D1146TI, DE08TIS diesel engines gases such as smoke, nitrogen oxide, hydrocarbon, or carbon monoxide and thus ensure high performance and low fuel consumption. 2 Printed in Jan. 2001 PS-MMA0415-E1A