Engines – ALL-NEW Sisu Diesels comply with latest emission regulations
* All-new 6 cylinder turbo intercooled Sisu Diesel engines featuring common rail fuel injection and four valves per cylinder power the MF 8400 Series tractors.
* Common rail injection uses electronic control to regulate and optimise injection pressure for all operating conditions and loads.
* It also allows fuel injection to be phased in up to five different stages on a single stroke. By analysing the engine’s demand more than 100 times every second, the electronic control unit can then regulate the fuel quantity and injection timing to precisely suit the load. The phasing system is key to reducing emissions while maintaining good fuel economy.
* By employing four valves/cylinder, it makes it possible to fit the combustion chamber centrally in the top of the piston. This is fed by a vertical injector in the middle - the best position for optimum fuel combustion. Doubling up the number of inlet and exhaust valves improves gas flow and reduces ‘pumping’ losses. It also maximises the fuel and air mix, which again lowers emissions and improves fuel economy.
* All engines produce their rated power at 2200rpm, but as revs fall, the power output increases to produce maximum power at 2000rpm helping the tractors to respond effortlessly to peak demands.
* The engines’ high torque level - produced between 1200rpm and 1500rpm – maintains high output as conditions get tougher.
* If engine revs fall due to higher loads, the torque characteristics – with 30% back-up on the MF 8450 and 35% on all other models – help the tractor to keep going without adjusting the transmission setting.
* Engine Speed Control function memorises two engine rpm settings that can be activated at the touch of button. This makes it more convenient for operators to set, for example, working and headland turn speeds which can be recalled instantly.
