Mazda may have come up with a game changer in regards to clean engine technology of the future. The company came out with news recently that it is releasing the first ever compression gasoline powered engine. The engine, known as SkyActiv-X, will be commercially available beginning in 2019. This technology combines the best of acceleration of gasoline engines with the fuel efficiency of diesel engines. Diesel fuel can only be ignited through compression where as gasoline powered engines require a sparkplug to start combustion. The company promises roughly 20-30% more fuel efficiency than the SkyActiv-G diesel engine and roughly 40-50% more fuel efficient than the older, mid-2000s engine models.
The advantages are huge for the company. Compression engines are simply more efficient in terms of energy output and energy savings. The use of direct injection of gasoline allows for correct combustion timing at the top of the cylinder without the use of high octane fuel. Diesel engines are about 30% more efficient overall from a thermal energy perspective than gasoline powered engines with roughly 137,000 btu of energy available vs. 120,000 btu in a gas powered combustion engine. Diesels will tap more into the potential energy available to them in the diesel fuel.
This translates into an engine that produces more horsepower and torque per gallon of fuel than a traditional powered gas engine. This also means less harmful emissions output per engine as well as less trips to the gas station. Some industry analysts have speculated that the only drawback could be safety concerns with regards to fuel leaks through the cylinders. With diesel it is non-flammable unless it is compressed, however, a raw gasoline leak on the block or valves could potentially cause major engine fires. Hopefully, Mazda engineers have addressed this issue, but this technology is still in its infancy.
Only time will tell how the new engine will play out in the market and what the future made hold for the more fuel efficient combustion engines.