|Honda’s 1.6L i-DTEC engine. Click to enlarge.|
The new 1.6-liter i-DTEC diesel engine to be applied first in the Civic is the first engine from Honda’s Earth Dreams Technology series to be launched in Europe. This new engine offers 88 kW (120 PS, 118 hp) of power and 300 N·m (221 lb-ft) of torque at 2000 rpm with CO2 emissions of 94 g/km (equivalent to 65 mpg US, 3.6 l/100 km). (Earlier post.)
Reduced weight. Honda’s new 1.6-liter i-DTEC features an aluminium cylinder head joined to an open deck aluminium block. It is the lightest diesel engine in its class, weighing 47 kg (104 lbs) less than Honda’s 2.2-liter i-DTEC engine. All the individual components were redesigned to minimize their weight and size; advanced production techniques have helped reduce weight even further.
|Cylinder and piston. Click to enlarge.|
The thickness of the cylinder walls has been reduced to 8mm, compared with 9mm for the 2.2-liter i-DTEC—an achievement for a diesel engine. In addition, lighter pistons and connection rods have been utilized in the 1.6-liter i-DTEC.
Reduced mechanical friction. The key target for Honda’s development engineers was to reduce the mechanical friction of the 1.6-liter i-DTEC engine to the level equivalent of a gasoline engine. All the rotating parts were optimized to reduce their friction, notes Tetsuya Miyake, project leader for the engine. For example, a shorter and thinner piston skirt was used. At 1500 rpm, the 1.6-litre i-DTEC has around 40% less mechanical friction than the 2.2-liter i-DTEC.
Turbocharger. The 4th generation Garrett turbocharger used on the 1.6-liter i-DTEC engine features an efficient variable-nozzle design and its rotational speed is precisely controlled by the car’s electronics, minimizing turbo lag and providing a combination of low- to mid-range pull and high-speed performance. The turbo has a maximum boost pressure of 1.5bar.
Fuel injection system and air flow. Honda’s 1.6 i-DTEC uses a Bosch solenoid injection system which is capable of operating at 1800 bar. With a high fuel pressure, fuel is injected at a faster rate and the fuel spray is atomized more finely. This improves the fuel mixing with the air resulting in a cleaner and more efficient combustion helping to achieve the low emissions and fuel consumption.
|High swirl head port inlet. Click to enlarge.|
Honda’s engineers have also worked to improve the volumetric efficiency of the cylinders, employing a high intake flow and a high swirl head port precisely controlling the combustion process to reduce hot spots that create unwanted emissions. The engine air flow is managed by using an EGR (exhaust gas recirculation) system that operates at high and low pressure to reduce NOx emissions.
The new 1.6-liter i-DTEC engine was specifically designed for the European market, to meet growing customer demand for low emission diesel engines. The new engine will be built at Honda’s European manufacturing facility in Swindon, UK.
Demonstrating the importance of this new diesel engine to Honda’s sales plans in Europe, a new purpose built diesel engine production line has been installed at Honda of the UK Manufacturing (HUM). This new line is capable of producing up to 500 diesel engines in one day. The new line will produce both the new 1.6-liter i-DTEC and the existing 2.2-liter i-DTEC engines.
The 1.6-liter i-DTEC diesel engine will also be applied to the new CR-V (also built at HUM) later in 2013.