Published: 16 Aug 2017

How does the Mazda HCCI work??

When Mazda announced that it was going to introduce petrol-powered Homogenous Charge Compression Ignition (HCCI) engine from 2019 the motor industry stood up and took notice. Seen by many as the holy grail of engines due to low emissions and superb efficiency, Jennings Motor Group takes a look at just what they are.

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What is a HCCI engine?

Using compression to ignite a mixture of fuel and air, it works in a similar way to a traditional diesel engine. With a standard petrol engine utilising a spark plug to ignite, HCCI is tough to implement with petrol-power due to a specific temperature being required to the fuel-air mix to combust.  When the engine is too hot then the timings become unpredictable; when it is too cold then there are issues with the ignition process.

Mazda HCCI solution

To create consistency Mazda have found a solution and that is to include a spark plug to ignite the fuel and air mixture should the temperature be too low. When the temperature is conductive to a HCCI engine then the technology takes over, such as when travelling on a motorway or in town.

Said to offer 20-30% more fuel efficiency than the existing engine options, HCCi engines also known as SKYACTIV-X, will also have the option of supercharge when required. It is unknown which model will be the first to feature a HCCI engine option.

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