Intake and exhaust manifolds

The definition of manifold is different for different generators. Let's talk about carburetor or throttle body gasoline injection engine first. The intake manifold here refers to the intake pipe from the back of the carburetor or throttle body to the front of the intake port of the cylinder head. Its function is to distribute the mixture from carburetor or throttle body to the air intake of each cylinder. For port fuel injection engines or diesel engines, the intake manifold only distributes clean air to the intake of each cylinder. The intake manifold must distribute air, fuel mixture or clean air to each cylinder as evenly as possible, so the length of air flow channels in the intake manifold should be as equal as possible. The inner wall of the intake manifold is smooth, which can reduce the gas flow resistance and improve the intake capacity.

Use of intake and exhaust manifolds

1) is used to provide a pressure signal for judging the engine load.

2) Use the vacuum of the engine to assist braking.

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Exhaust header

It is a bifurcated pipe that concentrates the exhaust of each cylinder and leads it to the exhaust manifold, which is connected with the engine block. It is mainly used to reduce exhaust resistance and avoid mutual interference between cylinders.

When the exhaust gas is too concentrated, the cylinders will interfere with each other, which will increase the exhaust resistance and then reduce the output power of the engine. The solution is to separate the exhaust of each cylinder as far as possible, with one branch for each cylinder or one branch for two cylinders.

Some racing cars will use stainless steel pipes as exhaust manifolds, which can better reduce exhaust resistance. Exhaust manifold @20 19