Malossi RACING Manifold D 22/28 length 29 inclined Minarelli horizontal

The Malossi RACING Ø 22x28 inclined intake manifold is an essential component for Yamaha, MBK, and Minarelli vertical 2-stroke 50cc engines. This intake manifold serves as an access corridor for the air-fuel mixture in the engine, through the reed valve.

The overall performance of an 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.

The intake manifold plays a fundamental role in volumetric efficiency, as it must allow the passage of the mixture with minimal loss. It is important to avoid sudden increases in section and sharp edges along the mixture's path.

In addition, the intake manifold acts as a fresh charge accumulator, allowing the mixture to compress against the reeds when the reed valve closes. Each manifold has a range of engine speeds in which it expresses maximum efficiency.

The manifold also serves the purpose of supporting the carburetor, connecting it to the engine crankcase or cylinder. In this way, it prevents vibrations that could cause fuel and air emulsion in the carburetor float bowl.

Malossi, with its many years of experience in engine fuel systems, has developed a new line of rubber and aluminum manifolds for the new generation of scooters. These manifolds have been tested and developed by the Malossi experience 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 fuels. This ensures a rigid attachment base to the crankcase and good elasticity of the manifold body.

Please note that some modifications to the surrounding plastics may be necessary to install MHR manifolds.

SPECIFICATIONS

• Material: NBR
• Holes: Ø 6.7
• Conduit: Ø 22
• Inlet: Ø 28
• Total length: 29
• Carburetor application: PHBG 15-21 Racing (hexagonal 28), PHVB 22, PHBL 22-25

COMPATIBILITY NOTES

For the installation, it is necessary to make some small modifications to the surrounding plastics.

The manifold is not compatible with the original air filter.