The Mitsubishi 4J1 engine is a new range of all-alloy straight-4engines. The main goal was declared as reduction on-road CO2 emission on new vehicles.[1]
The new 4J10 MIVEC engine features the use of a next-generation MIVEC system that continuously regulates intake valve lift, opening duration and timing. The new MIVEC system together with improved combustion stability and a reduction in piston friction provide an improvement in fuel economy without any loss in engine performance (output and torque) over the 4B10MIVEC engine (1.8-liter, inline-4, 16-valve DOHC).
The 4J11 engine is the newly developed engine further improving the fuel economy. This engine can keep the same output performance as the conventional 4B11 engine by using the new MIVEC system.
