Owned Mazda SKYACTIV engine is claimed to have the highest compression ratio is 1:14. This compression according Trainer Mazda Motor Indonesia, Ari Wibowo Tristianto the dream of all engineers in the automotive world, where torque and fuel efficiency can be achieved better.
Unfortunately the high compression impact on the needs of high-octane fuel and the risk of frequent knocking (tickle).
"The higher the compression, the higher the risk of knocking. You see, the pressure generated during combustion is increasing. The fuel can be burned itself prematurely," said Ari.For some manufacturers, rewind ignition timing an option in a knocking. However, a solution has resulted in a significant reduction in torque.
"The fuel efficiency can be achieved, but the torque drops if you use this way. So the same thing. So how to solve it, SKYACTIV have a solution," he said.To work around this, Mazda taken a different approach by changing the shape of the piston. If the general average of the piston head, SKYACTIV has a protruding upper trapezoid shape. Then at the top created a niche, much like the crater.
Dinisiasi combustion spark plug can be manipulated to be more evenly distributed. Due to the blast centered in a niche which then spreads balanced throughout the room. With perfect combustion engines cause money can be cooled more quickly and have an impact on the prevention of the symptoms of knocking.
"The fuels are burned alone it is because the temperature in the engine room is still very high," he explained.
In addition due to the combustion chamber is still hot, knocking may occur because of fuel waiting to enter into the machine is already heating up in advance. To that end, the direct injection system is required. You see, this technology not only prevents the fuel heats up, but also capable of cooling when sprayed into the combustion chamber.
"Through the injector, fuel is sprayed into small particles. Each particle has a large surface when exposed to air, so it is cooler," he said.
In addition to room temperature, this design is able to raise the boiling point of the fuel. Didh point higher can prevent the fuel burns itself.
"We found that boiling point that could be improved. The analogy is like this, ar it boils at a temperature of 100 degrees Celsius, with the container convex, the boiling point of water can be increased. Interestingly, when boiling can be manipulated to provide interventions such as inserting objects. It can we apply into the combustion chamber so that fuel is not burned myself, "he explained.Unfortunately, although able to achieve such high compression, for the Indonesian market should lower specifications Mazda becomes 1:13 due to the unavailability of appropriate fuel.
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