Malossi MHR TEAM aluminum thermal unit D 39,88 50cc piston pin 12 LC

The Malossi MHR TEAM Ø 39.88 thermal unit is a high-quality and high-performance product, ideal for riders participating in National and European Trophies.

This thermal unit is the natural evolution of the Malossi MHR line and has contributed to the victories of official teams in cross and speed trophies.

The cylinder is made with a special alloy of aluminum with a high percentage of silicon and titanium, which guarantees high resistance to high temperatures.

Thanks to a special heat treatment, the cylinder maintains its mechanical and dimensional characteristics constant up to temperatures of 250°C.

The machining operations are carried out with very tight dimensional and shape tolerances.

The inner surface of the cylinder is coated with silicon carbides on a nickel matrix, which gives the cylinder a very high hardness and remarkable wear resistance.

The piston is made with a special alloy with a high percentage of silicon, which guarantees resistance to heat and deformation to temperature variations.

The outer coating in tin reduces friction.

The structure of the piston is reinforced to withstand the stresses of a competition thermal unit, but at the same time, it is light to reduce inertia forces.

The segment is made of spheroidal cast iron with high mechanical resistance, with a hard chrome wear-resistant coating on the contact surface.

The head of the thermal unit is decomposable and has been specifically designed to ensure the disposal of heat generated by a high specific power engine intended for competition.

The head is made of a special alloy of hardened aluminum with a high silicon content and is directly fixed to the cylinder barrel.

The outer surface of the head is bathed in coolant, ensuring a large heat exchange surface.

The head is independent of the outer walls, allowing it to follow the expansion of the cylinder.

The combustion chamber is made with numerical control machines to guarantee precise dimensional and shape tolerances.

The decomposable head system is completed with a cover that ensures the sealing of the coolant.

The geometry and squish of the combustion chamber have been specifically designed for use in the Scooter Speed Trophy and Scooter Cross Trophy.