Exhaust manifold collects exhaust gas from the engine cylinders and channels it to the exhaust pipe. Generally, exhaust manifold is essential exhaust components made of cast iron or stainless steel. It disconnected to all exhaust ports on the cylinder head of the engine. It releases gases generated by the combustion process creating room for fresh air in the cylinders. The more oxygen the engine can burn the more power it can generate.
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Headers are exhaust manifolds that have an exhaust head pipe for each cylinder. The head pipes converge in a tube known as the collector. The exhaust valves open up when the fuel is burned to allow waste gases to escape. The cylinder contains high pressure which pushes the gases into the manifold. The manifold is designed in a way that it sucks exhaust from the cylinder.
Exhaust manifold work in tandem with gaskets to prevent harmful exhaust gases from finding their way into the vehicle cabin and harming the passengers.
How it works
Oxygen and gas mix in the cylinders where the fuel is burned by spark plug ignition. The manifold is connected to these cylinders directly. When the automobile engine starts, exhaust stroke the piston moves the cylinder bore upwards hence reducing the volume of the chamber. The highly pressurized exhaust gases escape through the exhaust valve into the exhaust manifold.
Some exhaust manifold has exhaust oxygen sensor mounted on the exit. These sensors measure the amount of oxygen on the exhaust gases and transmit this information to the engine computer. The information used to configure formulations of mixing air and fuel in the cylinders.
Exhaust gases collected by the manifold moves through the rest of the exhaust system components before being channeled to the catalytic converter, then muffler before leaving through the exhaust pipe.
High-performance automobiles use exhaust headers in place of the exhaust manifold. This is because the priority in these cars is maximizing horsepower over efficiency. Headers have low gas flow restrictions so that they can extract gas exhaust rapidly through highly effective scavenging. However, they can affect torque in low engine speeds. While it is possible to replace an exhaust manifold with a header, it is quite hard to do the opposite.
Usually, people replaced exhaust manifold with headers to increase torque and horsepower. The exhaust manifold, on the other hand, is designed for longevity and fitting. If the manifold cracks the vehicle will become irritatingly noisy. An engine warning light will also come on. The exhaust gases will also sneak to the vehicle interior. If the exhaust manifold gaskets are damaged, the same situation is bound to happen.
Cracked exhaust manifold are majorly caused by age and heat.
Symptoms of a bad exhaust manifold:
- Extremely noisy engine
- A decrease in fuel efficiency and performance
- Burning smell originating from the engine
Read more about your car’s exhaust system: