Benefit of turbocharger ecotech engine (used in SATURN SKY REDLINE)

Benefit of turbocharger ecotech engine  (used in SATURN SKY REDLINE)

 

COMPACT AND LIGHTWEIGHT MODULAR DESIGN

GM Powertrain’s Ecotec 2.0-liter SC (supercharged) four-cylinder engine delivers impressive power for its size and weight. The Ecotec 2.0L SC slams out a formidable (estimated) 200 horsepower at 5600 rpm and a matching (estimated) 200 lb.-ft. of torque at 4400 rpm.The ECOTEC engines are compact and lightweight.  Even though the 2.0L SC includes a supercharger and intercooler, the fully-dressed powertrain requires no more space within an engine bay than the standard 2.2L unit.  And at 330 pounds (150 Kg), the 2.0L SC weighs only 23 pounds (10 Kg) more than the 2.2L.

ROBUST HEAD ASSEMBLY

The head assembly on the Ecotec 2.0L SC engine is an advanced design.  Semi-permanent mold technology produces a higher strength aluminum casting with enhanced port flow for improved induction and more efficient air delivery to the combustion chamber.

STAINLESS STEEL INTAKE VALVES

The Ecotec 2.0L SC engine design includes upgraded stainless steel intake valves for improved strength and corrosion resistance. Undercut stems are used to improve flow and reduce weight.

 SODIUM-FILLED EXHAUST VALVES

The exhaust valves on the Ecotec 2.0L SC engine have sodium-filled stems that promote valve cooling, resulting in longer valve guide and seat life and more thorough combustion. At normal engine operating temperatures, the sodium inside the valve stem fuses and becomes liquid.  The liquid sodium improves conductivity, promoting heat transfer away from the valve face and valve guide to the cooler end of the stem where it can more readily dissipate.  This helps maintain a lower and more uniform exhaust valve temperature while reducing wear on the valve guide for better alignment and a more positive seal between the valve seat and the valve face.

CHAIN CAM DRIVE

The camshafts on the Ecotec 2.0L SC engine are driven by a single roller chain that is only 12.5-mm wide compared to the much wider-toothed rubber-belt drive systems. The chain’s smaller dimensions contribute to shorter overall engine length for improved packaging efficiency.

 ROBUST PISTON AND ROD ASSEMBLY

The Ecotec 2.0L SC engine is designed from the inside out to handle the demands of a 200-horsepower supercharged engine.  A 5.6-mm piston top ring land is utilized for piston strength, allowing optimization of engine performance. The pistons themselves are cooled and lubricated by targeted oil jets that keep their underside, along with the cylinder wall, in a continuous oil bath.  The large 23-mm piston pin provides a larger bearing surface to better handle the increased loads of a supercharged engine.  The connecting rods have been upgraded, incorporating a larger forged I-beam section for added strength.

 ROBUST DROP FORGED STEEL CRANKSHAFT

Like the upper end of the engine, the lower end of the Ecotec 2.0L SC engine is also built to provide lasting performance and durability.  The crankshaft is a drop forged steel design that incorporates induction heat-treated fillets for added strength, and cross-drilled, chamfered oil passages for excellent lubrication characteristics. 

 IMPROVED LUBRICATION

With supercharged engines it is especially important to maintain a high level of lubrication that is effectively distributed to all moving parts.  To that end, the Ecotec 2.0L SC engine is built with a large seven-quart oil sump and a crankshaft-driven pump.  A block-mounted oil cooler is included to ensure proper lubricant cooling that promotes long engine life.

 FUEL DELIVERY

To better utilize the advantages of a supercharged engine, the Ecotec 2.0L SC engine is equipped with sequential port fuel injection and a 380 KPa /19.0 g/s returnless fuel delivery system that helps keep fuel cooler for more efficient combustion.

 IGNITION SYSTEM

Performance objectives are also evident with the Ecotec 2.0L SC engine’s coil-on-plug ignition system that delivers maximum voltage to the spark plug for optimal firing and combustion characteristics.  The system utilizes a 58X crankshaft position encoder system to ensure ignition timing will be accurate throughout the operating range of this performance engine.

 HIGH FLOW EXHAUST 

Completing the Ecotec 2.0L SC engine’s performance enhancements is a thin wall, large runner 2.25-inch exhaust manifold for improved flow and reduced back-pressure.  High exhaust flow is achieved by utilization of a large 2.5 inch system, combined with a catalytic converter borrowed from the GM Truck line, and a  much increased muffler volume.   Low exhaust backpressure is a key contributer to the Ecotec 2.0L SC engine’s impressive performance.