After the great success of the crankcases, Malossi completes the work: as of today, the Ø 47 BIG D.E.P.S. aluminum thermic units are available again!

The only cylinders on the market for CIAO/SI with split exhaust and symmetrical transfers!!!!

The exhaust connection is bolt-on and offers two major advantages:

Extreme strength and possibility of replacement in case of breakage
Possibility to increase the exhaust outlet, further increasing performance

These results were made possible by the decompressor valve supplied in the kit, which is smaller in size than the original Piaggio valve.

The head has a hemispherical central combustion chamber.

Malossi BIG D.E.P.S. Aluminum Thermal Assemblies represent the ultimate balance of performance and component durability! The BIG D.E.P.S. have been designed and manufactured with the precise objective of obtaining thermal units capable of high reliability together with the refinement of internal thermo and fluid dynamics systems.

Malossi technicians, thanks to the experience gained in the preparation of competition engines, have taken the thermodynamics of the aluminum thermic units to the highest levels and taken care of the internal fluid dynamics of the thermic unit (see the transfer, exhaust and combustion chamber ducts), obtaining a high turbulence in the combustion chamber that has allowed to consistently reduce the specific consumption and to drastically reduce the exhaust polluting emissions.

Technical characteristics

Split exhaust
Symmetrical exhaust ports
Head with hemispherical central combustion chamber
Reduced size decompressor valve
Distribution: 6 transfers
Cylinders obtained by gravity casting in specific steel shells.
Material: tempered and stabilized high-silicon aluminum primary alloy.
Machining on high-precision CNC machine tools.
Barrel with silicon carbide coating in a galvanic nickel matrix and cross polishing with diamond passes to very tight tolerances.
Recalculated heat transfer surfaces.
Exhaust ducts and transfers designed and tuned for maximum thermodynamic efficiency.
Segments made of spheroidal cast iron with high mechanical strength with ground and lapped anti-wear hard chromium coating on the contact surface.
Dimensional shape and roughness checks.
Cylinder piston coupling: selections of 0.010-0.005 mm.
Hydraulic seal checks carried out at 100%.
2 muffler fittings; augmented Ø 27 - standard Ø 22

Thermal groups BIG D.E.P.S.: the perfect match to the Malossi crankcase !