Honda's new 1.6-litre i-DTEC diesel engine

Honda’s New High Performance, Low Emission, Small Diesel Engine in Detail

Civic 1.6

The New Civic 1.6-litre i-DTEC: The Engine in Detail

Lightest Diesel Engine in its Class

Honda’s new 1.6-litre i-DTEC is comprised of an aluminium cylinder head joined to an open deck aluminium block. It is the lightest diesel engine in its class, weighing 47kg less than Honda’s 2.2-litre i-DTEC engine.

All the individual components have been redesigned to minimise their weight and size and advanced production techniques have helped reduce weight even further.

The thickness of the cylinder walls has been reduced to 8mm, compared with 9mm for the 2.2-litre i-DTEC. This is an exceptional achievement for a diesel engine. In addition, lighter pistons and connection rods have been utilised in the 1.6-litre i-DTEC.

Reduced Mechanical Friction

The key target for Honda’s development engineers was to reduce the mechanical friction of the 1.6-litre i-DTEC engine to the level equivalent of a petrol engine. “All the rotating parts have been carefully optimised to reduce their friction,” says Tetsuya Miyake. For example, a shorter and thinner piston skirt has been used. At 1500rpm, the 1.6-litre i-DTEC has around 40 per cent less mechanical friction than the 2.2-litre i-DTEC.

“This not only reduces emissions and improves fuel efficiency; it also improves the engine’s response, both on and off the throttle, making the car more fun to drive. We have reduced the mechanical friction of the engine to the level equivalent of an existing petrol engine, which is an outstanding achievement.”

Clever Turbocharger

The 4th generation Garrett turbocharger used on the 1.6-litre i-DTEC engine features an efficient variable-nozzle design and its rotational speed is precisely controlled by the car’s electronics, minimising turbo lag and providing an optimal combination of low- to mid-range pull and high-speed performance. The turbo has a maximum boost pressure of 1.5bar.

Efficient Fuel Injection System and Air Flow

Honda’s 1.6 i-DTEC uses a Bosch solenoid injection system which is capable of operating at a high pressure of 1800bar. A high fuel pressure means that the fuel is injected at a faster rate and the finer the atomization of the fuel spray. 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.

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.

Contact Avonvale Honda Solihull, Coventry, Northampton or Stratford-upon-Avon to find out more about the new 1.6-litre -DETC diesel engine.