Daewoo D1146, Maintenance Manual

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D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
2
Printed in Jan. 2001 PS-MMA0415-E1A
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
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
head, the D1146TI, DE08TIS diesel engines
discharge very low level of hazardous exhaust
gases such as smoke, nitrogen oxide,
hydrocarbon, or carbon monoxide and thus
ensure high performance and low fuel
consumption.
M1041A