Valtra, a Leading Tractor Brand from AGCO - Common Rail Engines to Power N and T Series Tractors
Valtra N121, N141, T170, T180 and T190 tractors are to be powered by SisuDiesel Citius-series engines. Featuring Common Rail technology Citius-series engines meet Tier3/Stage3A emission legislation.
Valtra is a leading brand of the AGCO Corporation who also own brands Massey Ferguson, Fendt, Gleaner, Iseki and Challenger.
The T Series models are fitted with six-cylinder engines while N Series have four-cylinder units.
The T170, T180 and T190 will use the SisuDiesel 74CTA-4V engine, with a displacement of 7.4 litres.
The engines are equipped with an air-to-air intercooler and have four valves per cylinder.
This allows the fuel to be injected directly from above the piston, making the ignition more efficient.
The N121 will use the SisuDiesel 44CWA engine and the N141 the 49CWA engine.
The 49CWA has the same piston bore as the 44CWA, but extra displacement has been gained by increasing the stroke.
The N141 offers extra power up to 160 horsepower, making it the most powerful tractor in its class.
At their heart the new engines have third generation of electronic engine management, EEM3. N Series tractors offer extra power, or transport boost, whenever the main gear is in H2 or higher.
The maximum power of the new engines is greater than its nominal output, giving more power when the rpm begins to drop as loads increase.
Another new feature is continuous fuel system management when the engine is running and if the engine is threatened by a major malfunction, the system automatically limits the power to a minimum, allowing the tractor to be driven safely to the field side or workshop.
The EEM3 system improves fuel economy, improves cold starting and makes servicing easier.
Together, Common Rail and EEM3 allow the fuel injection to be divided into up to five different stages during a single ignition.
The more injection stages, the lower fuel consumption and noise.
For drivers, the new Citius engines offer many advantages: The engines react faster to throttle changes and are significantly quieter.
The knocking that is typical of diesel engines has been eliminated by pre-injecting fuel and evenly increasing ignition pressure.
The timing gears have a new profile resulting in reduced mechanical noise.
A additional feature on N Series tractors reducing fuel consumption further is a low idle; when the tractor’s handbrake is applied this automatically drops to just 650 rpm.
26-Oct-2006