Malossi Aluminium cylinder D.47 pin D.12 BIG D.E.P.S.4 MHR for Piaggio

BIG DEPS 4 MHR è7 Cylinder kit

The cylinder draws its peculiar characteristics from the BIG DEPS range: the same aluminium alloy, barrel with nickel-chromium coating, the same redesigned central core and identical ring washing strategy.
The support surface in the front part of the cylinder continues to be worked with high precision diamond tools and has 4 holes for fixing of the exhaust flange.
The result has translated into a further and significant increase in performance!
Finally, the most reliable and safe strategy of coupling and centring between cylinder and head has also been applied to these cylinders: external centring!
Using this technique, the same used in our range of racing cylinders, the relative centring of the two components is obtained thanks to a high precision coupling created on a diameter external to the cylinder fixing studs.
This strategy is successful because it does not require any interface component, such as, for example, bushings, and moreover, being created on a diameter external to the studs, it can be used to exploit areas of the cylinder normally free from further tensions, typical of the geometry close to the barrel, where combustion takes place, without dangerously overloading the resistant structure.
The position makes the machining more agile and allows greater precision of the couplings.

TECHNICAL SPECIFICATIONS

• Material: primary aluminium alloy with a high content of tempered and stabilised silicon.
• Exhaust flange connection.
• Updated intake ports.
• Completely centralised exhaust port with re-profiled crosspiece!
• Single ring piston.
• New annealed aluminium head gasket.
• Fixing to the casing with 4 studs!
• Completely redesigned head.
• High precision coupling between head and cylinder thanks to an external centring.

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