GMSA introduces advanced diesel engine for Captiva

GENERAL Motors South Africa (GMSA) has announced the introduction of a 2.2 litre turbo diesel engine option for the popular Chevrolet Captiva SUV.

This latest generation common rail diesel engine with variable geometry turbocharger produces 135kW @ 3800 r/min and 400Nm of torque at 2000 r/min. Drive is through a 6-speed automatic transmission to all four wheels.

Chevrolet’s 2.2 litre DOHC turbo and intercooled diesel engine is one of the most powerful and fuel efficient engines in its class.

At the core of this is its advanced design and the incorporation of a high-pressure common rail fuel injection system – the system pressure is 1800 bar – together with variable geometry turbocharger (VGT).
Highlights of this latest generation turbo diesel engine include a double overhead camshaft configuration with four valves per cylinder and variable swirl combustion chamber design for optimised combustion, enhanced performance, and minimised emissions with reduced diesel particulates. Engine vibration and knock have also been minimised for improved durability.

Camshaft timing is by way of a chain drive for improved timing accuracy and lower maintenance costs. A hydraulic tensioner in the chain drive ensures that the system always operates within its tight timing specification. The chain drive system also contributes to a reduction in engine noise and vibration.

The diesel injection system is a high-pressure common-rail design operating at a pressure of 1800 bar. Precise timing and measurement of the fuel charge is accomplished by the use of solenoid type injectors. This system ensures an optimised fuel/air mixture and injector spray pattern into the combustion chamber.
This all-new engine has a very rigid engine block, an aid to reduced NVH (noise, vibration and harshness). The advanced combustion chamber design has enabled the compression ratio to be reduced from in excess of 17:1 on previous engines, to 16,3:1. The result is an engine that boasts higher specific power with lower emissions than on the previous design.

Already a clean burning engine by design, the Chevrolet 2.2L engine has a high efficiency exhaust gas re-circulation cooler that channels unburnt exhaust gas back into the induction system for lower emissions. This system not only assists in lowering emissions but also improves engine life by improving combustion and reducing engine knock and vibration.

Other features of this engine include oil-jet cooled pistons, a balance shaft module integrated into the oil cooler for significantly reduced noise and vibration, and a dual-mass flywheel that eliminates low frequency resonance and transmission noise at low engine speeds. -Words and image: www.quickpic.co.za