The Mitsubishi 4G63T engine is a 2.2-liter, twin-turbocharged engine that displaces 1,997 cubic centimeters with a bore of 85 millimeters and stroke of 88 millimeters. The 4G64T offers power output of 240 to 280 horsepower and compression ratios ranging between 7.5:1 and 9.9:1.
The Mitsubishi 4G63T was produced from 1987 to 2007 and used in a variety of models up until 2006. The engines are best known for being used to power the Mitsubishi Evolution series of cars. From 1987 to 2007, the engine was improved but the basic design never changed. Three generations of the 4G63T were produced, each time making small changes to increase efficiency and power.
The first generation engines in the Evolution I, Evolution II and Evolution III models. They had reworked exhaust and intake ports, new injectors, larger intercoolers, lighter connecting rods and larger turbochargers. The compression was raised to 8.5:1 in the Evolution one and two models, and it was also raised in the Evolution III to 9.0:1, which used an even larger turbocharger than previous models.
The second generation engines powered the Evolution IV, Evolution V and Evolution VI models. The major change for this generation was that the cam drive and flywheel were relocated opposite of previous models. These engines used lightweight pistons and compression ratio was 8.8:1. The exhaust and intake manifolds were also reworked to increase air flow. Mitsubishi also reduced turbo lag by adding an air injection system. The Evolution V was mostly the same as the Evolution IV except it used a larger turbocharger. The Evolution VI had improved engine cooling by adding cooling channels to the pistons, reconfiguring the layout of the coolant path and added a larger oil cooler.
The third generation was introduced in the Evolution VII and modifications included adding hollow camshafts to the valvetrain. Also, a revised intake manifold and a higher flowing exhaust improved air flow. Water spray nozzles were also placed in front of the intercooler to cool the air that enters it. The Evolution VIII was revised even more, including an update of the intercoolers cooling system by adding a better water pump and making water pipes larger. There were modifications to reduce engine weight, which included forged steel connecting rods, new exhaust manifold, heavy duty aluminum pistons and a revised drivetrain. The evolution IX was the last model to use the 4G63T engine, and it included a few changes, such as variable valve timing, two piece rings, extended reach spark plugs and a revised turbocharger.