Dual-scroll exhaust turbine enhances velocity, reducing turbo lag to an insignificant level without adversely affecting top-end performance. | 
Direct injection puts the fuel-injection nozzle right in the combustion chamber, enhancing combustion efficiency and allowing for a leaner mixture. The Ecotec turbo's piston is specially contoured to aim the injected fuel at the spark plug. | 
Additional resistance to detonation is achieved with oil spray injectors that fire oil into a cast-in channel inside the piston, taking heat away from it. |
| Ecotec 2.0-Liter Turbo Specifications |
| Assembly Site: | Spring Hill, Tennessee |
| Application: | '07 Pontiac Solstice GXP |
| Type: | 2.0-liter DOHC turbocharged I4 |
| Displacement (ci / cc): | 122 / 1,998 |
| Bore x Stroke (in x mm): | 3.38 x 3.38 / 86 x 86 |
| Block Material: | 319 aluminum |
| Cylinder Head Material: | 356 T6 aluminum |
| Intake Manifold: | Cast aluminum |
| Exhaust Manifolds: | Cast stainless steel |
| Compression Ratio: | 9.2:1 |
| Valve Configuration: | Overhead cam; four valves per cylinder (35.1 mm int. / 30.1 mm exh.) |
| Valve Lifters: | Hydraulic lash adjuster, roller finger follower |
| Throttle Body: | 58 mm |
| Firing Order: | 1-3-4-2 |
| Fuel System: | Gasoline high-pressure, variable-rail pressure, spark ignition direct injection (SIDI) |
| Horsepower (hp / kW): | 260 / 194 at 5,300 rpm (SAE certification pending) |
| Torque (lb-ft / Nm): | 260 / 353 at 2.000-5,300 rpm (SAE certification pending) |
| Fuel Shut-Off: | 6,300 rpm |
| Crankshaft: | Forged steel |
| Connecting Rods: | Forged steel |
| Additional Features: | Air-to-air intercooled dual scroll turbocharger system, variable valve timing, electronic throttle control, pressure-actuated piston cooling jets, extended-life spark plugs, extended-life coolant, GM oil level sensor, extended-life accessory drivebelt, Nimonic sodium-filled exhaust valves |
This shot of combustion chamber shows the four-valve layout, the centrally located spark plug, and the direct injection nozzle, located behind the intake valves. The Ecotec engine family has benefitted from many high-tech features that help make this turbo powerplant the most powerful engine per liter that GM has ever produced. | 
The direct injection system is shown here with the electronic control module. It uses a returnless delivery system that operates at over 1,200 psi. | 
This drawing shows the basic layout of the intercooler system. It reduces the charge temperature by over 200 degrees, greatly improving air density and the engine's resistance to detonation. |
Variable valve timing is used for both intake and exhaust valves. It is computer-controlled... | 
...and uses cam position sensors for precise control. Valve overlap can be optimized in this manner to increase torque. | |