Yanmar EF-494T - Combustion System; Low Emission Technology Applied to TNV Engine

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
86
3.2 COMBUSTION SYSTEM
3.2.1 Low emission technology applied to
TNV engine
<Fuel injection technology>
(1) MP4 pump
 Atomization by high-pressure injection (70
MPa)
 Injection timing optimized by using a multi-
functional timer mechanism
<Fuel injection technology>
(2) New type nozzle
Increased number of nozzle hoes (5 nozzle holes)
Finer atomization by making the nozzle hole
diameter smaller
Uniform injection by rounding the edge of each
nozzle hole
(A) Nozzle for TNV engine
(R) Rounded inlet of nozzle hole