Malossi VR-One reed valve crankcases
The VR-One is for power purists, for those seeking to push their Vespa to the limit. This crankcase has been designed to withstand increased power and is supplied with main bearings for the flywheel side (Ø25xØ52×15) and for the drive side (Ø25xØ62×12) which both use balls instead of rollers, which offer greater radial load tolerance capacity and an additional resistance to axial loads, which is not possible with the original roller bearings. Dedicated seals are also supplied.
The greater resistance to stress means the crankcase is perfect for assembly with the Malossi single-ring MHR cylinders, (210cc 57mm stroke), but especially with the 225cc 60mm stroke. The natural partner for this configuration is the Malossi 60mm stroke full circle crankshaft, which is perfect for reed valve induction with the new VR-One. Supplied with the complete reed valve assembly that, thanks to the new high-quality carbon fibre reeds, ensures an increase in power across all operating speeds and allows achievement of the highest performance.
The supplied manifold, designed according to Malossi's X360 technology used in their competition specification reed valves, consists of a die-cast flange connected to a Viton manifold rubber, which guarantees a perfect hermetic seal, and at the same time positions the inlet in the correct direction. The pipe has an inlet diameter of 30mm which is perfectly suited to the Dell'Orto PHBH 30 carburettor (not supplied).
The attention to detail is evident in every square millimetre of the crankcase and is clearly obvious. Using gravity casting, Malossi was able to strategically increase the reinforcement in the most stressed areas and to further treat the crankcases after casting, thus obtaining an extremely high mechanical strength. These crankcases are made of a high-quality Al Si 7 Mg aluminium alloy containing: silicon, to increase the mechanical resistance; manganese, for improved resilience and corrosion resistance and also copper and magnesium, to improve overall workability. The machining of the crankcases is performed entirely at Malossi's workshop using CAD/CAM techniques and takes place within highprecision CNC machining centres. All the support and sealing surfaces have been finished with diamond-tipped tools that guarantee smooth surface finishes and virtually perfect mating surfaces. Product features: front arm reinforced with tension discharge ribbing and cross-section profiles calculated to allow the correct flow and channelling of stresses and to guarantee a higher level of resistance. Factory-fitted brake shoe pivot. Electric start compatible. The crankcases have transfers ports that are perfectly profiled and sized for use with Malossi Ø68.5 cylinders. M8 studs for cylinder mounting are also included in the crankcase kit.
More info: www.ve-uk.com