Malossi ALUMIN-CYL. 57,5 pin 15 MHR VESPA-PIAGGIO

Technical features

Cylinder

• Material: alluminium
• Cooling: liquid
• Bore: Ø 57,5 mm
• Stroke: 51 mm
• Capacity: 132 cc
• Compression ratio: 1:12,7
• Cylinders obtained by gravity die-casting in permanent steel moulds.
• Material: hardened and tempered high silicon content primary aluminium alloy.
• Machining: on numerically controlled high precision machine tools.
• Cyliner with silicon carbide metal-spray coating on a galvanic nickel matrix, cross-honed with passes with diamonds for very tight tolerances.
• Recalculated and upgraded heat exchange surfaces.
• Exhaust and transfer ports designed and tested for maximum thermodynamic performance.
• Dimensional and surface finish quality control performed according to Malossi’s internal specifications.
• Cylinder and piston selected for a fit of 0.005 mm.
• Checking of all the seals carried out.

Piston

• Material: special aluminium alloy with high silicon content and low thermal expansion.
• Machining on numerically controlled machine tools.
• Lightened and reinforced.
• Heat exchange surfaces increased.

Piston rings

• Piston rings in very strong modular cast iron with ground, wear-resistant, hard chrome metal-spray coating on the contact surface.