Carscoop MB DS 52
Mercedes-Benz DiesOtto
Manufacturer Mercedes-Benz
aka "DiesOtto"
Type Gasoline
Production/Introduction 2007 Frankfurt Motor Show
Status "Concept Only"
Displacement 1.8 litre (1800cc)
Aspiration Turbocharged
Configuration write the configuration of the cylinders
Cylinders Four (4)
Fuel System write if it is injected or carburated and the system used
Lubrification indicate the engine's type of lubrification
Output 238 hp (175 kW) @ N/A rpm
400 Nm of torque @ N/A rpm
Bore in inches
Stroke in inches
Compression write compression ratio here
In. Valves in inches
Ex. Valves in inches
Firing Order Firing order of cylinders
Left Bank Write which cylinders are in this bank (write N/A if it it is inline)
Right Bank (same as above)
Length in inches
Diameter in inches
Width in inches
Height in inches
Dry Weight lbs. / kg.
Fuel Consumption 44 mpg (5.3 litres/100km)
Emission/s CO: g/km
CO2: g/km
NOx: g/km
Hydrocarbon: g/km
Particulate: g/km
Chief Engineer write here

The Mercedes-Benz DiesOtto is an experimental (also called concept-engine) automobile engine that is said "to incorporate the benefits of a diesel engine, but runs on regular old unleaded." [1]

Its name is an intended play on words, referring to the Diesel engine, first introduced by German engineer Rudolf Diesel, and the Otto cycle, as a reference to Nicolaus Otto, both being German (even though the paternity of the gasoline engine is still disputed between Nicolaus Otto and Alphonse Beau de Rochas).


Unique Attributes[]

The Diesotto is an inline 4 gasoline engine, with a 1.8l displacement. Its peak power is no less than 238 bhp/175 kW (that makes for 132 bhp/l) with a peak torque of 400 Nm (222 Nm/l). However, the revs at which these peake horsepowrer and torque are achieved are not specified[2].

The Diesotto features the following:

  • controlled auto ignition, much like that of a Diesel;
  • variable valve timing;
  • variable geomerty turbocharging;
  • variable compression ratio;
  • direct gasoline injection.

It is also fitted with a starter alternator to further increase its mileage in town conditions. Its principle of operation is to operate using controlled auto ignition on low demanding conditions (even shutting down the engine altogether at a stop thanks to the starter alternator), and harvest the full benefits of turbocharging and direct injection on high demanding conditions.

It is reported to achieve less than 6l/100km (or more than 47 UK mpg, 40 US mpg) in the body of an S class. However, it is unknown in what conditions this mileage is achieved. Nevertheless, these mileage figures are only bested by the smallest Diesel engines on sale in Europe, and in far smaller cars than the S class.


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Design quirks and oddities[]

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See Also[]

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