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Supercharger: Single-stage variable-speed centrifugal type supercharger driven through a barometrically controlled clutch; MW50 injection into the supercharger intake. Fuel system: Bosch direct fuel injection; Oil system: Dry sump with one pressure and two scavenge pumps; Cooling system: Liquid-cooled, pressurized; Reduction gear: 0.594:1
The final development, which was fitted to the 100-series Merlins, was an S.U. injection carburettor that injected fuel into the supercharger using a fuel pump driven as a function of crankshaft speed and engine pressures.
This is the last version of M271 engine family. Dimensions are the same as E18 ML and DE18 ML, but the supercharger has been replaced with a turbocharger; like the DE18 ML it uses the CGI (Stratified Charged Gasoline Injection) gasoline direct injection. Output ranges from 156 PS (115 kW; 154 hp) at 5200 rpm to 204 PS (150 kW; 201 hp) at 5500 rpm.
The term fuel injection is vague and comprises various distinct systems with fundamentally different functional principles. The only thing all fuel injection systems have in common is the absence of carburetion. There are two main functional principles of mixture formation systems for internal combustion engines: internal and external.
The direct fuel injection system, advanced piston and combustion chamber design and the supercharger provide improved fuel consumption and emissions, as these engines meet EU5 emission regulations in Europe and Rest of World (ROW) and ULEV 70 emission regulations in North American Specification (NAS) markets.
Supercharger: Gear-driven single-speed centrifugal type supercharger (later, hydraulic-driven) rated to 4,000 m (13,000 ft) [6]) Fuel system: Direct fuel injection Oil system: Dry sump with one pressure pump at 0.3–0.35 atm (4.4–5.1 psi; 0.30–0.35 bar) and two scavenge pumps
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