Manifolds

The intake and exhaust manifolds together ensure the efficient supply and discharge of air through the combustion engine. The intake manifold is mounted on the engine block and funnels air from the air filter to the engine. In older engines the injectors are also mounted in the intake manifold to inject fuel so that it is carried along with the air into the cylinder. The intake manifold must ensure that all cylinders are optimally supplied with air. The exhaust manifold ensures the efficient removal of exhaust gases after combustion has taken place. As with the intake manifold, the exhaust manifold should have as few restrictions as possible and a smooth finish for optimum flow. The exhaust manifold is constructed in such a way that the exhaust gases from each cylinder come together at the right moment in the collector. After all, the cylinders take it in turns to give off their exhaust fumes. Turbocharged engines have a piece of flange in the exhaust manifold on which the turbocharger is mounted to act as an exhaust gas turbo.

When fitting the intake and exhaust manifolds, new gaskets must also be fitted for an airtight seal to prevent leakage. These gaskets can be found in the "Gaskets" category. If you have any questions or would like advice, please contact our product specialists. They will be happy to assist you.

Intake manifold

When the inlet valve opens, a vacuum is created by means of which air is sucked through the intake manifold and can enter the cylinder. In turbocharged engines, overpressure is created on the intake manifold and air is forced into the cylinder instead of being sucked in like a naturally breathing engine. Most modern engines are equipped with, for example, a variable intake section which allows the length of the inlet pipe to be adapted to the engine speed and throttle position. This optimises cylinder filling and contributes to the efficiency of the engine. It is advisable to check the function of such valves and control modules when the intake manifold is disassembled, as this type of element frequently fails due to contamination. It goes without saying that extreme engine damage occurs when a swirl valve comes loose and is sucked into the engine.

Exhaust manifold

The exhaust manifold ensures the efficient removal of exhaust gases after combustion has taken place. As with the intake manifold, the exhaust manifold should have as few restrictions as possible and a smooth finish for optimum flow. The exhaust manifold is constructed in such a way that the exhaust gases from each cylinder come together at the right moment in the collector. After all, the cylinders take it in turns to give off their exhaust fumes. Turbocharged engines have a piece of flange in the exhaust manifold on which the turbocharger is mounted to act as an exhaust gas turbo.