Nozzle Installation Angle
The installation angle of the fuel injection nozzle is greater than that in conventional engines, so that uneven atomization of fuel between injections can be reduced. Excellent matching between intake swirl ratio and the shape of the combustion chamber has resulted in uniform mixing of fuel in the combustion chamber. Therefore, performance including combustion efficiency, startability, noise, and exhaust emission has been improved. On the 4TN94L, -98 and -98T by using 2 inlet and 2 exhaust valves, air intake and expulsion is markedly improved. Vertically mounted injector nozzle minimizes imbalance of spray pattern.
Combustion Chamber
It increases the fluid energy of the air and fuel charge. The swirl effect produced in the chamber continues while combustion occurs, aiding mixing and results in lower exhaust emissions compared to conventional chambers.
Fuel Injection Equipment
MP Type Fuel Injection Pump
A new MP pump has been developed especially for the TNV engine series. Our aim was to make improvements over a wide range of areas to even further reduce emissions. Features are:
-High injection pressure
-Use of a mono plunger reduces uneven injection between the cylinders.
-Timing Control Device system optimizes injection to take into account speeds, loads and the startup phase.
-New mechanical governor helps to maintain cleaner exhausts.
-Minimal variation from chosen revs at low speed using constant pressure valve.
Fuel Injection Nozzle
-Multiple numbers of very small holes are used to achieve uniform atomization.
-Holes are not simply drilled, their inside edges are carefully rounded to promote even flow and direction of spray, also to reduce resistance.
-Low sack nozzle profile improves combustion. Double corn shape protects from cavitation.
Noise Level Reduction
Cylinder Block Noise Reduction
It increases the fluid energy of the air and fuel charge. The swirl effect produced in the chamber continues while combustion occurs, aiding mixing and results in lower exhaust emissions compared to conventional chambers.
Muffler Noise Reduction
Original CAE technique is used to design a muffler with optimized volumes and sound isolation materials.
