Malossi Manifold D 25 straight pitch 50.8 for PHBL 23/24/25 B carburetors

The Malossi Ø 25 straight rubber intake manifold with a 50.8 center distance is designed for PHBL 23 - 24 - 25 B carburetors.

This intake manifold serves as an access corridor for the air-fuel mixture into the engine through the reed valve.

The overall performance of the engine depends on various factors, including volumetric, thermodynamic, and mechanical efficiency.

Volumetric efficiency represents the ratio between the amount of mixture entering the combustion chamber and the engine displacement.

One of the main influences on volumetric efficiency is the friction encountered by the mixture during its path from the air filter to the combustion chamber.

The intake manifold plays a fundamental role in minimizing this loss by avoiding abrupt changes in section and sharp edges along the mixture's path.

In addition, the manifold acts as an accumulation lung for the fresh charge, allowing the mixture to accumulate when the reed valve closes.

Each manifold has a specific range of engine speeds in which it offers maximum performance.

In addition to these functions, the manifold also supports the carburetor, connecting it to the engine crankcase or cylinder, and dampens vibrations to prevent fuel and air emulsion in the carburetor float bowl.

With its years of experience in the field of engine fuel systems, Malossi has developed a new line of rubber and aluminum alloy manifolds for the next generation scooters.

These manifolds have been tested and developed by Malossi's research department, both on the road and on race circuits.

Malossi rubber manifolds feature a composite structure, with an aluminum insert embedded in a plastic material resistant to oils and gasoline.

This ensures a rigid attachment base to the crankcase and good elasticity of the manifold body.