The amazing 45.2 engine is, of course, the centre piece of RXV technology. Aprilia was the first manufacturer in the world to believe in the validity of V twin architecture in a market segment in which all other marques still cling rigidly to single cylinder engines. Aprilia’s high-tech V twin design has already proven to be 100% reliable in competition. Even homologation for road use has not compromised the technology and performance of this exceptional engine, which is produced entirely by Aprilia. Since the earliest stages of the design process, the 45.2 has evolved to keep pace with chassis development and to give the RXV an unbeatable mix of power and handling.
The 77 ° V angle is the result of extensive testing, not only to increase strength, but also to reduce vibration. Because the Aprilia engineers have to start the engine balancer shafts. Although this engine still vibrates far less than the 45.2 one single cylinder alternative.
In the MY ’09 the flywheel has increased in weight to improve power delivery and achieve a smoother ride.
Just as much effort has been put into weight reduction, and the 45.2 engine sets a new record for a V twin with an electric starter. Abundant use has been made of prestige lightweight materials. The central crankcase sections are in aluminum-silicon alloy; external engine casings are in magnesium; the valves are in titanium; and all gears are exceptionally light in weight.
2009 Aprilia RXV 550 MSRP: $8,599*, 5.5 – $9,299* USD