GM Opel Introduces More Efficient 1.8-Liter Engine

25 March 2005

GM’s Opel is introducing a new, more efficient 1.8-liter gasoline engine in its brands this summer. The all-new Ecotec engine increases horsepower and torque by up to 14%, while reducing fuel consumption by about 4%.

The all-new four-cylinder unit will debut this summer in the new Opel Zafira and be available in the Vectra and Signum, as well as other Opel models, in the near future.

The new Ecotec 1.8-liter offers 103 kW (138 hp) of power and 175 Nm (129 lb-ft) maximum torque. The engine features a number of technology improvement that provide the increase in efficiencies:

• Two continuously adjustable camshafts (DCVCP – Double Continuous Variable Cam Phasing) to optimize the charge cycle. Unlike conventional engines, where the crankshaft and camshaft are mechanically linked in a fixed Crank Angle (CA) via a toothed belt or a chain, this engine allows the intake and exhaust cam to twist relative to the crankshaft. This is continuously varied on the new 1.8-liter engine using an extremely compact, lightweight hydraulic vane-type phaser. The variable range is 60° CA on the inlet side and 45° CA on the outlet side.

  Depending on the engine’s speed and operating conditions, the valve timing can be selected for optimum performance or fuel consumption. Advantages of the double camshaft adjustment include higher power output and torque characteristics over a wide engine speed range due to optimized cylinder charging; reduced exhaust emissions thanks to high exhaust gas recirculation rates; and reduced fuel consumption via a de-throttled charge cycle.

• A two-step intake manifold with a rotary sleeve instead of flaps to minimize flow losses.

• A highly efficient oil-water heat exchanger.

• A map-controlled thermostat.

• A deep drawn exhaust manifold with an integrated catalytic converter.

The redesigned engine is 3% lighter than its predecessor, despite the addition of features such as DCVCP. The cylinder block alone is 20% lighter than its predecessor.

Separately, GM announced that a Zafira-based HydroGen 3 fuel cell vehicle will enter the Monte Carlo Fuel Cell and Hybrid Rally in April.