GRUPPO TERMICO MALOSSI 68,5 IN ALLUMINIO CVF2 CON SPINOTTO 16 PER VESPA COSA - PX E 2T 200 CC

The Vespa never dies

1983: the Ø 68.5 aluminium cylinder is born, a turning point in the development of the Vespa .

Made of Nicasil aluminum, with a super light piston, 1.2 mm semi-trapezoidal rings, the new cylinder immediately became a legend, a real must for all enthusiasts.

2008: the cylinder is updated, with the addition of the head with hemispherical combustion chamber and central spark plug.

2013: the cylinder, although still made of Nicasil aluminium, is completely redesigned in the transfer ducts, both main and rear, and in the exhaust duct, and presented in three versions:

• MHR : Art. 3116349

The MHR version differs from the SPORT not only in the exhaust port but also in the decidedly racing transfer diagrams.

The perfect centering between the head and the cylinder is guaranteed by two centering bushings placed on two studs, while the O-ring ensures a perfect seal.

2016: completing the long list of updates comes the new piston with a black skirt, the result of a molybdenum sulphide treatment. The semi-trapezoidal segmentation and the crown remain unchanged, while the real innovation is in the completely new mold, in which the new slots allow not only a perfect connection with the latest generation of the cylinder, but also interchangeability with its previous versions. The ribs, completely revisited, ensure a very light design and even greater resistance.

Art. 3116349

MHR Ø 68.5 aluminium CVF2 cylinder kit, Ø 16 pin: Sports-racing use

Suitable for use with heavily tuned engine crankcases , with carburettors of Ø 30 and above, with Malossi Power Exhaust BLACK Sound muffler Art. 3217143 .

Warning : it is absolutely essential to use fuel taps with increased flow rate.

TECHNICAL FEATURES

ALUMINUM CYLINDER

• Cylinders obtained by gravity casting in specific steel shells.
• Material: primary aluminum alloy with high silicon content, tempered and stabilized.
• Processing: on high-precision numerically controlled machine tools.
• Barrel with silicon carbide coating in a galvanic nickel matrix and cross-polished with diamond passages with very tight tolerances.
• Heat exchange surfaces recalculated and increased.
• Exhaust ducts and transfer ports designed and tested for maximum thermodynamic efficiency.
• Dimensional checks of shape and roughness according to Malossi standards.
• Piston cylinder coupling selections of 0.005 mm.
• 100% hydraulic seal check carried out.