Structure of the 1.3-liter i-DSI combustion chamberIn a conventional engine, there is only one spark plug per cylinder but the i-DSI engine has two spark plugs in each cylinder. The i-DSI engine fires its two spark plugs at different times to ensure the mixture of fuel and air burns thoroughly whatever the prevailing conditions. At lower engine speeds, the spark plug nearest the inlet valve is fired much earlier than usual while the plug nearest the exhaust valve is fired later than usual. At higher rpm, the sparks are fired simultaneously.In a normal engine, fuel and air enters the cylinder of an engine through the inlet valve, designers concentrate on optimizing the swirl of the mixture to ensure fuel is atomized thoroughly and evenly.
The i-DSI uses a radical twin-spark ignition system with just two valves per cylinder. It improves efficiency and power while reducing fuel consumption and emissions. Timing of sequential ignition, on the intake and exhaust sides, is controlled depending on the speed and workload of the engine.
Cut-away view of the 1.3-liter i-DSI engine and new Honda Multimatic S transmission
Two spark plugs per cylinder are arranged diagonally to accelerate flame propagation in the combustion chamber, thus achieving rapid combustion of the air-fuel mixture and obtaining high output from a minimum amount of gasoline. This intensive combustion at any rpm not only controls knocking, but also permits a much higher compression ratio, achieving a maximum output of 63kW (86PS) at 5700 rpm*2, and maximum torque of 119Nm (12.1kg-m) at 2800 rpm*3. The engine is paired with Honda's newly-developed, lightweight, compact Multimatic S continuously-variable-speed transmission, which minimizes engine power loss to achieve ultra-high fuel efficiency of 23km/L*4 --- world class top level for a gasoline powered production vehicle, and compliant with 2010 fuel efficiency standards. Furthermore, harmful exhaust emissions have also been greatly reduced: the i-DSI engine's clean performance is recognized by the National Ministry of Transportation's "Low Emissions Excellence" certification.
[Notes]
The engine has also been made 8% lighter and more compact than Honda's previous 1.3- liter engines. This was achieved by reducing the valve angles to create a smaller combustion chamber, and by incorporating a more compact air cleaner, a serpentine auxiliary drive system, a plastic intake manifold, a stainless-steel exhaust pipe, and other innovations.
The lightweight, compact, high-performance i-DSI engine in tandem with a newly developed Honda Multimatic S transmission creates a new breed of small car that achieves ultra-high fuel efficiency and clean emissions coupled with superior performance. In addition, the smaller engine room makes for a roomier passenger compartment.
[Notes]
| *1 | DSI: Dual & Sequential Ignition |
| *2,3,4 | Values determined by in-house testing. |
The engine has also been made 8% lighter and more compact than Honda's previous 1.3- liter engines. This was achieved by reducing the valve angles to create a smaller combustion chamber, and by incorporating a more compact air cleaner, a serpentine auxiliary drive system, a plastic intake manifold, a stainless-steel exhaust pipe, and other innovations.
The lightweight, compact, high-performance i-DSI engine in tandem with a newly developed Honda Multimatic S transmission creates a new breed of small car that achieves ultra-high fuel efficiency and clean emissions coupled with superior performance. In addition, the smaller engine room makes for a roomier passenger compartment.
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