DiesOtto

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DiesOtto is an experimental car engine that aims to combine diesel-like efficiency with gasoline operation. The name blends Diesel and Otto, referencing the diesel engine and the Otto cycle. Mazda announced a car using a DiesOtto-style engine, called SKYACTIV-X, in 2017. The engine is an inline four-cylinder, 1.8 liters, producing about 235 horsepower and 400 Nm of torque. A starter-alternator replaces the flywheel, allowing the engine to stop at lights and restart instantly to save fuel. It runs in two modes: a low-demand mode based on HCCI, and a high-demand mode that acts like a normal spark-ignition gasoline engine with direct injection, turbocharging and variable valve timing. It also has a variable compression ratio, using a mechanism similar to a Lanchester shaft. Reported fuel use is under 6 L/100 km on an S-Class demonstration car, though exact conditions aren’t specified. Prototypes were shown in the Mercedes-Benz F700 concept and in a demonstration S-Class with an electric motor to mask the power transition.