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The 20V configuration was mainly designed for haul trucks. Detroit could push the envelope of the 16V (in the marine version it could produce 2,400 hp (1,790 kW) @ 2100 RPM) but it would require special parts. They wanted 2,500 hp (1,864 kW) with standard production parts, so the 20V149 was born.
Diesel engines are typically well suited to turbocharging due to two factors: A "lean" air–fuel ratio, caused when the turbocharger supplies excess air into the engine, is not a problem for diesel engines, because the torque control is dependent on the mass of fuel that is injected into the combustion chamber (i.e. air-fuel ratio), rather than the quantity of the air-fuel mixture.
Diesel engines are used in aircraft, automobiles, power generation, diesel–electric locomotives, and both surface ships and submarines. The Diesel cycle is assumed to have constant pressure during the initial part of the combustion phase (to in the diagram, below). This is an idealized mathematical model: real physical diesels do have an ...
1952 Shell Oil film showing the development of the diesel engine from 1877. The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is called a compression-ignition engine (CI engine).
In diesel engines, the top ring can expose the oil to temperatures over 315 °C (600 °F). Motor oils with higher viscosity indices thin less at these higher temperatures. [5] Coating metal parts with oil also keeps them from being exposed to oxygen, inhibiting oxidation at elevated operating temperatures preventing rust or corrosion.
The letter "H" in this case refers to "horizontally-opposed", an alternative term for flat engines; these engines can also be said to look like a "H" or conjoined "H"s, albeit from the top and in schematic form. The Saab H engine is a straight-four engine produced from 1981 to 2009. The letter "H" represents "high compression".
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