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One, that the exhaust gases intermingle with the fresh air needed for combustion, leading to some recirculation of burnt gas. Secondly, this co-mingling also raises the temperature of the intake gas. Both of these are much less of a problem in a diesel than a petrol engine, hence the Comprex's rarity in petrol-engined applications.
In an internal combustion engine, a turbocharger (also known as a turbo or a turbosupercharger) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the engine in order to produce more power for a given displacement .
A centrifugal supercharger is a specialized type of supercharger that makes use of centrifugal force in order to increase the manifold air pressure, MAP. An increased MAP allows the engine to burn more fuel, which results in an increased power output.
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
Following the war, the Turbo-Compound [4] system was developed to deliver better fuel efficiency. In these versions, three power-recovery turbines (PRT) were inserted into the exhaust of each group of six cylinders, and geared to the crankshaft by fluid couplings to deliver more power. The PRTs recovered about 20% of the exhaust energy (around ...
The most commonly used forced-induction devices are turbochargers and superchargers. A turbocharger drives its compressor using a turbine powered by the flow of exhaust gases, whereas a supercharger is mechanically powered by the engine (usually using a belt from the engine's crankshaft).