Continuously refined over the years, the legendary cast iron cylinder kits for Vespa now come with a new code, after having undergone a further upgrade regarding above all the main rear transfer ports, the exhaust duct and the intake duct, which has been significantly increased in size.
This is the only thermal group of its kind that uses an O-ring as a sealing gasket between the head and the cylinder. The new head also features a centering track to allow it to mate perfectly with the cylinder.
By improving low-end torque in particular, this engine further increases performance.
Continuing on its path of tireless and total renewal and continuous research into the best possible technical solutions, Malossi has created a new piston specifically for the cast iron cylinder intended for the Vespa. Borrowed from the construction technology underlying the piston that equips the aluminum cylinder, the new piston gains a ring and much more strength. Its intake slot is split to increase its strength and for better guidance inside the cylinder barrel. This solution has made it possible to obtain both further rigidity, eliminating the upper slot from both sides of the piston, and an excellent flow to the transfer ports.
Peeking inside the piston crown gives you an idea of the almost maniacal work that characterizes the entire design and development phase of this new product. Extrusion has been abandoned in favor of a structure with more pronounced ribs that guarantees the piston a first-rate resistance, while making it significantly lighter.
Once again, with this evolution, Malossi technicians have exceeded all expectations!
Cast iron Ø 57.5 thermal group
Cylinder
Material: special self-lubricating, wear-resistant cast iron alloys with a very high degree of refinement, obtained by gravity casting using the Shell Moulding process.
Processing: on high-precision numerically controlled machine tools.
Heat exchange surfaces recalculated and increased.
Exhaust ducts and transfer ports designed and developed for maximum thermodynamic efficiency.
Dimensional checks of shape and roughness according to Malossi standards.
100% piston-cylinder fit in 0.010-0.005mm selections.
100% hydraulic seal check carried out.
Piston
Material: Special high-silicon aluminum alloy with low thermal expansion.
Processing: on numerically controlled machines.
Lightened and strengthened.
Increased heat exchange surfaces.
Segments
Segments in high mechanical resistance spheroidal cast iron with wear-resistant hard chrome coating on the contact surface, ground and lapped.
Head
Material: Special die-cast aluminum alloy.
Geometry of heat exchange surfaces recalculated and increased.
Processing on super precise numerically controlled machines with diamond tools.
Antioxidant surface treatment.
Compression seal with Viton gasket.
Hemispherical combustion chamber with squish and spark plug in the center.
Ø 57.5 mm
Urban / sport use
Power Range 12 / 18
Easy processing level
Recommended carburetor Shb 20/ phbl 25
Race 51
Compression ratio 1:11.4
No. of segments 2
No. of decantings 7
Hemispherical head
Central Candle iw f 24
Compatibility Table
ESA 3114930 VESPA ET3 125 CYLINDER HEAD D.57.5 CAST IRON BASE+CVFL 2ND SERIES
Code: 3114930
The Product may be reserved exclusively for competitions in places specially designated for such purposes according to the provisions of the competent sports authorities. We decline all responsibility for improper use.
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Billaricambi staff
