FIREWALL 1246482 - Caterpillar

Illustration 1 g01914622
Air inlet and exhaust system (typical example) (1) Exhaust manifold (2) Inlet manifold (3) Engine cylinders (4) Air inlet (5) Turbocharger compressor wheel (6) Turbocharger turbine wheel (7) Exhaust outletEngines which are naturally aspirated pull outside air through an air cleaner directly into the inlet manifold (2) . The air flows from the inlet manifold to the engine cylinders (3) . The fuel is mixed with the air in the engine cylinders. After the fuel combustion occurs in the engine cylinder, the exhaust gases flow directly to the outside air through the exhaust manifold (1) .Turbocharged engines pull outside air through an air cleaner into the air inlet (4) of the turbocharger. The suction is caused by the turbocharger compressor wheel (5) . Then, the turbocharger compressor wheel compresses the air. The air flows through the inlet manifold (2) which directs an even distribution of the air to each engine cylinder (3) . Air is pulled into the engine cylinder (3) during the intake stroke of the piston. Then, the air is mixed with fuel from the fuel injection nozzles.Each piston makes four strokes:
Intake
Compression
Power
ExhaustThe sequence of the strokes by all of pistons in all of the engine cylinders provide constant air flow to the inlet system during the engine operation.The exhaust stroke and the timing of the valve mechanism pushes combustion gases out of the open exhaust valve through the exhaust manifold (1) . The exhaust gases flow through the blades of the turbocharger turbine wheel (6) which causes the turbine wheel and