MHR  63 ALUMINUM CYLINDER HEAD CVF2 WITH  15 PIN AND 60 STROKE

Ø 63 ALUMINIUM THERMAL GROUP

A completely new thermal unit is born, designed in every part to achieve maximum performance and durability. Every aspect of the system has been studied to maximize mechanical resistance, fluid dynamics, and improve combustion: the result is a top-of-the-line kit in terms of build quality and technological advancement.

TECHNICAL CHARACTERISTICS

Cylinder

Crafted entirely from scratch, from high-strength aluminum alloy with a nickel-chromium-plated liner. Consisting of a central core with a constant thickness around the liner and transfer ports, it ensures constant heat exchange, thus controlling the gas inlet temperature in the chamber and optimal heat exchange at the exhaust. It has aerodynamically profiled cooling fins around the core, designed to be penetrated by the cooling air with the best possible efficiency. The greatest innovation is the completely revised and updated transfer ports, introducing the CVF according to the latest developments obtained thanks to experience gained from competition. The transfer ports have now been increased to 7, a distinctive feature of Malossi kits, thanks to which it has been possible to obtain the best fluid dynamic performance.
The connection to the muffler is made possible by a flange-fitting assembly secured to the cylinder by 4 cylindrical head screws and an O-ring sealing the exhaust duct inserted to prevent any leakage from the cylinder unit. This extremely simple assembly system allows for the maximum resistance to accommodate all types of mufflers on the market with a Ø 37 inlet, avoiding any problems with unscrewing or rotation due to vehicle vibrations.
The connection to the head is now achieved through high-precision centering on the support surfaces, achieved using numerically controlled machines. A set of multi-thickness base gaskets is supplied to allow the user to adjust the compression to suit a wide variety of uses.

Piston

Cast from an innovative material consisting of a steel core coated with an aluminum-silicon alloy, which provides extreme lightness as well as excellent corrosion resistance, even at high temperatures, and reflection of combustion heat, the heat flow is then directed toward the dissipation surfaces, promoting cooling of the combustion chamber and maintaining it within the optimal temperature range. The internal part of the skirt features ribs immersed in the casting, which have achieved the right amount of strengthening in the areas most subject to mechanical stress while also allowing for maximum piston weight reduction. The windows in the rear section and the diametrical recesses ensure the maximum possible flow of fresh charge to the cylinder transfer ports.

Head

Another revolution in the construction philosophy of 2-stroke engines: the cooling fins have been sized to optimize the heat flow from the chamber to the outside but are now also profiled according to modern simulations to allow the maximum possible penetration of the air coming from the cooling system, which now laps the head with an increase in efficiency of over 10% compared to a traditional straight-fin system.
The distinctive hemispherical combustion chamber is machined to tolerances of a tenth of a millimeter and develops highly turbulent combustion, with pressure peaks calculated at the most suitable engine speeds to achieve maximum performance in terms of torque and power. The extremely high temperatures reached in this particular boundary between the head and the cylinder, which often cause hot spots and detonations, are regulated thanks to an aerospace-inspired solution: a vacuum chamber duct made with two bulkheads and a series of inlet and outlet deflectors. Thanks also to a precise surface profile, these convey a portion of the cooling air, forcing it not only to lap the surfaces but also to expand, decreasing, thanks to a precise physical principle, the pressure and therefore the temperature of the walls bordering the combustion chamber.

Attention:
It is absolutely essential to use fuel taps with increased flow rates.

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