49134 - 00021 Excavator Turbocharger For Diesel Engine 6SD1 RHC7

49134 - 00021 Excavator Turbocharger Engine 6SD1 / RHC7 Excavator Part

Specifiion

Description

Turbochargers were originally known as turbosuperchargers because all forced induction devices are classified as superchargers. Technically, turbochargers are superchargers, however today, the term "supercharger" is typically applied only to mechanically driven forced induction devices. The key difference between a turbocharger and a conventional supercharger is that a supercharger is mechanically driven by the engine, often through a belt connected to the crankshaft, whereas a turbocharger is powered by a turbine driven by the engine's exhaust gas.[20] Compared with a mechanically driven supercharger, turbochargers tend to be less responsive. Twincharger refers to an engine with both a supercharger and a turbocharger. Belts, chains, shafts, and gears are common methods of powering a supercharger, placing a mechanical load on the engine. For example, on the single-stage single-speed supercharged Rolls-Royce Merlin engine, the supercharger uses about 150 hp (110 kW). Yet the benefits outweigh the costs; for the 150 hp (110 kW) to drive the supercharger the engine generates an additional 400 hp (300 kW), a net gain of 250 hp (190 kW). This is where the principal disadvantage of a supercharger becomes apparent; the engine must withstand the net power output of the engine plus the power to drive the supercharger.

Characteristic

1.Lowering the rotational inertia of the turbocharger by using lower radius parts and ceramic and other lighter materials
2.Changing the turbine's aspect ratio
3.Increasing upper-deck air pressure (compressor discharge) and improving wastegate response
4.Reducing bearing frictional losses, e.g., using a foil bearing rather than a conventional oil bearing
5.Using variable-nozzle or twin-scroll turbochargers

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