Common rail

In Common Rail engines the fuel can be delivered in up to five stages during a single ignition. The electronic engine management can analyse and adjust the amount of fuel needed by the engine over 100 times per second. The multi-stage fuel injection plays a major role in lowering emissions. At the same time, optimal fuel efficiency can be maintained.

Advantages of common rail engines

• Exceed Tier III emissions standards
• high fuel injection pressure, precise fuel injection timing and efficient intercooling help manage emissions
• CR engines react quickly to changes in load
• Strong torque achieved at low rpm. Torque remains high even if engine speed drops during work, making work efficient and improving fuel efficiency
• Basic construction of SisuDiesel engines offers long life:
     - intercooler
     - wet cylinder liners, centrally supported
          • reduces cylinder liner vibration
          • minimises wear on cylinder liners and pistons
          • low oil consumption
     - fuel system located on cold side of engine
     - fuel filters can be easily changed without tools and without leaking fuel.
     - easy access to maintenance components
• optimal ignition thanks to CR preinjection
   - lower noise levels
   - new and pleasant engine sound
• four-valve-per-cylinder technology improves fuel flow through cylinders and reduces heat load around cylinders.

Low idle

A new Valtra innovation is low idle for Common Rail engines. The ordinary idling speed is 850 rpm. When the tractor is parked and the hand brake engaged, the engine speed drops to a pleasantly quiet 650 rpm further reducing fuel consumption. When starting driving again the control lever must be lifted to N position, and the idling speed is immediately increased to 850 rpm to make use of the high start-up torque of the engine.

Power bulge

Power bulge means that the engine delivers the maximum power at lower rpm than the rated speed. T Series CR engines have a rated speed of 2200 rpm, but the maximum power is achieved at 2000 rpm. The power bulge is approximately 3-4 hp.

Benefits
• Improved fuel efficiency
• Reduced noise levels
• Less downshifting
• Increased productivity

Permatorque

SisuDiesel engines feature Permatorque, which offers a torque reserve (A) from the rated rpm to the rpm of the maximum torque. In the T Series the maximum torque is achieved at 1500 rpm (EcoPower 1100 rpm). Permatorque (B) means that the torque remains constant until 1000 rpm. High torque at low rpm (C) enables a smooth start up during PTO work and moving off with heavy loads.

Transport boost

Models with Common Rail fuel injection offer extra power boost for transport driving, which enables efficient transports. The power increase is 5-6 percent at field speeds. Transport boost offers extra power in gears H2, H3 and H4. The power bulge is also available in transport boost mode.

Ecopower

Farmers and contractors are constantly seeking out new ways to respond to the needs of cost-efficiency and rising fuel prices. EcoPower was introduced by Valtra in 1999. The new Common Rail technology adds new dimensions to the third generation of EcoPower.
In T151 models, the EcoPower function lowers the maximum engine speed by 400 rpm. This reduces fuel consumption by up to 10 percent. At the same time, the average piston speed is reduced by 20 percent, which also extends the life of the engine by around 20 percent. Lower engine speeds also lower engine noise by several decibels, which in turn improves driving comfort. Another new property in EcoPower is the chance to switch between the efficient Eco Mode and the standard Power mode.

Two tractors in one

EcoPower has many new exciting features. Two driving modes can be selected:

Ecospeed

EcoSpeed is based on the 50-km/h transmission, but the highest speed is limited to approximately 40km/h (max possible speed is 43km/h depending on load).

• Engine speed at max speed of 40 km/h is around 1800 rpm depending
  on tyre size
• Speed with H4, Delta PS 2nd gear: 40 km/h at 2200 rpm
• Speed with H4, Delta PS 3rd gear: 40 km/h at 1800 rpm
• Lower fuel consumption
• Lower noise, less wear
• Available for T131-T191 models

Note that the speed chart for EcoSpeed models is the same as for 50-km/h models apart from the limitation in H4 to 40km/h. 
  
Special output with Sigma Power

The nominal power output of T191 Sigma Power models is 189 hp. When the PTO is sufficiently loaded, the maximum output of the engine increases to 211 hp and the engine provides 22 hp of additional power for use at the PTO shaft. Sigma Power models are ideal for use with implements that require a lot of PTO power, such as power harrows, rotary tillers, mulchers and shredders.

Cruise control

Cruise control allows the driver to set the desired driving speed or PTO speed. The pre-set speed is maintained automatically regardless of changes in load. When turning in the headland or stopping work, the speed can be temporarily be returned to idle or other pre-set speed at the push of a button. The working speed is then regained automatically by pushing the button again. Cruise control makes daily work simpler and faster. The quality and productivity of work are also improved.