While the 2.7-litre CRD engine will become available in Limited trim level Grand Cherokee, the new Overland will be fitted with the new, high output version of the Jeep 4.7-litre V8 petrol engine.
Producing 255 bhp – 16 per cent more power than the highly-acclaimed standard 4.7-litre V8 – and 314 lb ft torque – an eight per cent increase over standard – this engine provides the Grand Cherokee Overland with a top speed of 128 mph. This compares with the 124 mph top speed of the standard 4.7-litre V8, which will continue to be available on Limited versions.
The 4.7-litre HO engine is mated to the Jeep five-speed 45RFE automatic transmission. This transmission provides an overdrive gear for increased highway fuel economy and reduced engine noise at highway speeds.
Overland accelerates from zero to 62 mph in just 8.3 seconds, compared with 9.0 seconds on the standard 4.7-litre Grand Cherokee.
To produce the extra power and torque, Jeep engineers in the Chrysler Group’s Powertrain Platform Team began by adding symmetric pop-up-style pistons to the standard Grand Cherokee 4.7-litre PowerTech V8 petrol engine, raising its compression ratio. Next, they modified and fine-tuned the cylinder heads, connecting rods, crankshaft and intake manifold. Stereo knock sensors were also added. The engine is built at the Chrysler Group’s Mack Avenue Engine Plant in Detroit, Michigan.