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Antiguo 06-Sep-2006, 14:46   #4
TRD-Power
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Fecha de Ingreso: 04-June-2006
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Lancer Evolution drivetrain layout.

Engine
The Lancer Evolution sedan is powered by a strong, highly-refined version of the venerable, turbocharged, intercooled, 2.0-liter, 16-valve, DOHC, four-cylinder, 4G63 engine that has powered the previous seven versions of the Lancer Evolution sedan. In the U.S. market, this turbocharged four-cylinder motor first gained notoriety as a performance engine with its appearance between the fenders of the first generation Eclipse (1989-1994). Within the tuner community, these engines became popular for their reliability, power and a responsiveness to tuning that facilitated increases in output. In the Lancer Evolution sedan series each subsequent version of the 4G63 showed increases in power and torque, while improving drivability with reductions in turbo lag that broadened the engine’s torque and responsiveness.
The U.S.-specification Lancer Evolution’s 4G63 utilizes a revised and reinforced cast iron block filled with a reciprocating assembly consisting of a durable forged steel crankshaft, and 150 mm forged steel connecting rods; cylinders are filled with low compression (8.8 to 1) pistons cast in durable, lightweight AC8A (T6) aluminum designed to withstand forced induction cylinder pressures for an extended period.
The cylinder block’s five main bearings are reinforced with a supportive bearing cap girdle that helps stabilize the crankshaft at high speeds. The rugged forged steel crankshaft features a 61 mm main journal diameter and 57 mm rod journal diameter, large enough to endow the crank with superior strength, and yet not so large a surface area to present a challenge for lubrication at high rpm. The bottom of the engine block is also equipped with oil jets that open under high oil pressure levels to help cool the bottom of the piston and provide additional lubrication to its friction surfaces. With an 85.0 mm bore and an 88.0 mm stroke, this engine displaces 1,997 cc that is electronically limited to 7,000 rpm. Power production for the turbocharged, intercooled, 16-valve engine is 271 horsepower at 6,500 rpm and 273 lbs.-ft of torque at 3,500 rpm.
This engine’s aluminum cylinder head casting features intake and exhaust ports designed to maintain higher intake mixture and exhaust gas flow velocities and bolster the engine’s responsiveness in the lower to mid-range engine speeds without compromising high speed intake and exhaust airflow characteristics. With four-valves per cylinder, the engine exhibits a high-level of air flow efficiency that, with the help of a metal reinforced, three-layer head gasket, makes the engine package more capable of withstanding the high cylinder pressures associated with a forced induction application.
Turbocharger
The rugged 2.0-liter, four-cylinder engine relies on turbocharged and intercooled forced induction to produce more power than most V6 engines available today. Attached to the Lancer Evolution’s high-flow, thin-wall vacuum cast stainless steel exhaust manifold is a Mitsubishi TD05HRA-16G6-9.8T twin scroll turbocharger.

4G63’s twin-scroll turbocharger is attached to a high flow exhaust manifold helping to improve the compressor’s efficiency.


With the twin scroll turbine housing design, the exhaust gases flow through the exhaust manifold into a pair of passages, instead of a single larger volume passage.This helps the cast iron turbine housing to smoothly and efficiently direct the exhaust energy over the turbine wheel, yielding improvements in the engine’s low-to-mid range engine throttle response and torque production. The compressor side of the turbocharger features a lightweight heat resistant Inconel turbine wheel with reduced mass to help the unit produce higher boost levels with improved engine response.
The turbocharger is equipped with an internal wastegate that helps regulate boost level by acting as a bypass valve to relieve exhaust gas flow and reduce boost pressure. At 3,500 rpm, under wide open throttle, the turbocharger produces a peak boost pressure of 19 psi. The turbine wheel is attached to an efficient compressor wheel via a shaft that is lubricated by pressurized engine oil. A large capacity engine oil cooler helps control temperature and maintain the viscosity of the Mobil1® synthetic oil used in this high-performance engine to ensure many miles of durable service. The lightweight compressor wheel ingests and pressurizes ambient air that is passed through a large front mounted intercooler which lowers intake air temperature to help produce more power and reduce the potential of detonation.


















Large, external air-to-oil cooler helps control oil temperatures and promote engine and turbocharger durability.The efficient twin-scroll turbine housing design directs exhaust flow over the Inconel turbine wheel.
Engine Weight Savings

























Lancer Evolution’s engine features numerous weight savings refinements that help improve the vehicle’s performance.


In the interest of refinement and increased performance from the Lancer Evolution engine, Mitsubishi engineers have progressively improved the design with numerous weight saving measures. The Lancer Evolution’s engine is equipped with a super-lightweight cast magnesium rocker arm cover, which, along with hollow camshafts, helps reduce the engine’s top-side weight and reduces it’s center of gravity in the chassis. The reduced mass of the hollow intake and exhaust camshafts, along with more compact, tapered, bee-hive shaped valve springs, featherweight aluminum retainers, and lighter, natrium-filled exhaust valves reduce valvetrain inertia and help improve the engine’s responsiveness. The stainless steel, natrium-filled exhaust valves also help lower the temperature of the bell end of the exhaust valve by retaining less heat. The cylinder head is also equipped with hardened, sintered metal exhaust valve seats that are better able to resist the forces of heat and pressure.














The Lancer Evolution motor utilizes hollow, belt driven camshafts that help reduce valvetrain weight and inertia.

The 2.0-liter engine’s elastomer-filled, vibration-dampening crankshaft pulley is manufactured from aluminum and reduces pulley weight by 340 grams over the standard Lancer engine’s pulley. The engine’s accessories are powered by a single serpentine belt system driven by the crankshaft pulley. In addition, the engine utilizes a more compact balance shaft arrangement to help give a smooth-revving character while reducing the power-robbing inertia of the balance shafts.























The turbocharged 4G63 engine equipped in the Lancer Evolution sedan uses high-flow, natrium-filled exhaust valves to help reduce valvetrain mass and help reduce the amount of heat retained by the exhaust valve’s bell shaped end.




















Compared to the Lancer sedan’s springs and retainers, the valve springs used on the Lancer Evolution series are smaller, stronger and with the help of an aluminum retainer, reduce valvetrain mass.

























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