2019 Jeep Cherokee Limited – Evolution of Renowned Mid-size SUV. 2019 Jeep Cherokee Limited – Drive, Interior and Exterior.
The 2019 Jeep Cherokee offers a practical and dependable choice for everyday adventures with premium on-road manners and impressive fuel efficiency – courtesy of three engine offerings. One of the most technologically advanced engines in the automotive industry, the all-new 2.0-liter direct injection turbocharged inline four-cylinder engine is rated at 270 horsepower and 295 lb.-ft. of torque and is mated to a high-efficient nine-speed automatic transmission. Benefits of the new engine include outstanding fuel economy with engine stop-start (ESS) technology, low emissions, quick 0-60 miles per hour (mph) launch performance, and enhanced drivability.
The all-new 2.0-liter I-4 features a twin-scroll, low inertia turbocharger with an electric actuated waste gate for exceptional responsiveness and performance, even while traversing over difficult terrain. The turbo is mounted directly to the cylinder head to reduce emissions and improve durability. A dedicated cooling circuit lowers the temperature of the intake air, throttle body and turbocharger.
The 2.0-liter turbocharged I-4 engine is part of the Global Medium Engine architecture family and features double overhead camshafts (DOHC), dual independent camshaft timing, and a cooled exhaust gas recirculation (C-EGR) system. This is the first time that the combined use of a twin-scroll turbocharger, C-EGR system, central direct injection and the independent liquid cooling intake of air, throttle body and turbo have been employed together. This combination of technologies enables the high levels of performance and reduces fuel consumption.
Direct injection, coupled with turbocharging, enables more efficient combustion, reduced emissions and increased performance. The 2.0-liter I-4 engine’s fuel pump supplies the engine’s 2,900-psi high-pressure common-rail injection system. These high pressures produce better fuel atomization and allow for more precise fuel delivery than port fuel-injected systems, which in turn improves both performance and efficiency.
The cast aluminum alloy cylinder head features a central injector and high tumble intake ports. This combination provides high charge motion and balanced air flow to improve fuel efficiency and performance. Integrated into the cylinder head is a water-cooled exhaust manifold to reduce emissions while providing increased engine reliability.
The 2.0-liter I-4 engine features a low-pressure, sand cast-aluminum block with cast-in iron liner with an 84mm bore and 90mm stroke for a total displacement of 1,995cc. Cast-aluminum pistons, with a 10:1 compression ratio, have four valve pockets to accommodate the dual variable-valve timing [VVT] system. Each cylinder bore is fitted with gallery-mounted piston oil cooling jets to limit piston temperatures, reduce spark knock and increase piston durability. Select-fit main and rod bearings enable reduced clearances to help lower system oil demand and oil pumping effort. In addition, floating piston pins utilize diamond-like coating (DLC) for reduced friction.
The high-energy ignition system includes a high-energy ignition coil for better fuel efficiency. Precious-metal spark plugs with iridium and platinum provide lasting durability. Located in the center of the cam cover, the spark plugs are easily accessible when service is required. Sodium-filled exhaust valves and plasma-coated piston rings also help extend the engine’s life and bolster durability.
A variable displacement two-stage oil pump provides high oil pressure under high speed but switches to a low-pressure mode for improved fuel economy during typical driving conditions. The piston cooling is also managed by the two-stage oil pump to enhance fuel economy under normal driving conditions while improving durability under demanding, high-load engine operation. A large capacity oil cooler extends the oil change interval and ensures engine durability.
An inverted tooth primary chain drives both the intake and exhaust camshafts and minimizes noise. Camshafts are robotically assembled using hollow shafts and have polished cam journals to reduce weight and improve durability for engine stop-start operation. The use of hollow shafts provides a 3.5-lb. weight reduction when compared to an equivalent solid shaft.