Malossi aluminum thermal unit D 75,5 piston pin 16
for PIAGGIO, APRILIA, GILERA, DERBI
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-20%
Special Price €764.00 Regular Price €954.89
The Malossi Ø 75.5 thermal unit is a high-quality product made of aluminum, ideal for 4-stroke mopeds.
The cylinder has a bore of Ø 75.5 mm and a stroke of 63 mm, ensuring a displacement of 282 cc.
The compression ratio is 12.5:1.
The material used for its construction is a primary alloy of silicon-hardened aluminum, with a silicon carbide-coated barrel in a galvanic nickel matrix.
The surface is cross-honed with two diamond passes, ensuring very precise tolerances.
The machining is carried out on high-precision CNC machines, with cylinder-piston couplings selected with a tolerance of 0.05 mm.
The heat exchange surfaces have been recalculated and increased to ensure excellent heat dissipation.
The piston is super compact and composed of three segments.
It is made with a special primary alloy of low thermal expansion silicon aluminum, with a tin coating on the sliding walls.
The piston is also machined on CNC machines, lightened and reinforced.
The heat exchange surfaces have been increased to ensure effective heat dissipation.
The piston rings are special, with high sliding properties and high mechanical resistance.
The first compression ring is made of nitrided and chromed steel, while the second ring is made of special cast iron.
The oil scraper is composed of three pieces of special alloyed and chromed steel.
The head of the thermal unit is made of gravity-cast primary aluminum alloy, hardened and sandblasted.
The machining is carried out on super precise work centers, ensuring millimeter tolerances.
The exhaust and intake springs are made of pre-tempered chromium-silicon steel and stabilized with a recalculated load, suitable for engine enhancement.
The valve guides have a recalculated profile and are obtained through a powder sintering process, using steel, phosphorus, carbon, copper, and manganese.
The valve seats are made of an alloy of steel, cobalt, molybdenum, and copper with a special thermochemical treatment.
The intake valves are increased in diameter to Ø 25 mm and made of special alloyed steel with a thermochemical treatment.
The exhaust valves are increased in diameter to Ø 22.2 mm and made of Nimonich 80 material, a nickel, chromium, titanium, and aluminum alloy.
