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Racing Cylinder ATHENA 70 cc
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Description
for MINARELLI vertical 50ccm 2T AC
aluminium
47,6mm
1 piston ring(s)
pin 10mm
with cylinder head
TUNING RACE – for professionals Product description
New racing cylinder with sophisticated features for the air-cooled MINARELLI engines with upright cylinder. With the newly developed racing cylinder, ATHENA offers many technical refinements and details that have never been seen before in this area. The result is one of the most powerful racing cylinders in the 70cc segment. What are the advantages of the ATHENA racing cylinder
New mounting system
Newly designed intake and exhaust ports
Newly designed piston to maximise intake flow
REINVENTED MOUNTING SYSTEM The traditional bolt-based head and cylinder mounting system has been replaced by a new system of special bolts very similar to those used on high-performance engines. The fastening of the cylinder to the crankcase (Racing type) with these bolts and a special Allen key results in a reduction of the thermal expansion of the cylinder, which leads to a more efficient fastening and, on the other hand, allows the ingenious redesign of the exhaust port that makes this product so special and unique. A REVOLUTION IN CONNECTIONS The vast experience of Athena’s technicians in the 2T sector has enabled them to challenge the traditional design in this cylinder. The intake and exhaust ports have been completely redesigned: by analysing the engine’s thermofluid dynamics, the overall performance in terms of power and torque has been greatly improved. The intake port has been reinvented by adding a CNC-milled fifth port to ensure a higher gas flow into the combustion chamber. NEW RACING PISTON The flat top piston was designed with special attention to the interaction with the intake port. The CNC-machined port on the piston skirt is designed to maximise intake flow to allow higher pressure on the pump housing and better lubrication of the needle bearing. The technical details at a glance
Bore:
7.60mm
Capacity: 70ccm
Compression ratio: 13.8:1
The best setup – our
