MALOSSI Complete engine crankcase 1147901

Description V-One ROTARY VALVE

The V-One has been designed for anyone looking for a crankcase that is perfectly replaceable with the original, supplied with all the components necessary for assembly (see above) and that allows maximum interchangeability with market components. The V-One is suitable both for a complete restoration, as it does not require any modification to the vehicle and can be adapted to all original Piaggio parts, and for a simple "refresh" to give a touch of flair to the engine with a moderate tune-up, such as that offered by our Ø63 thermal group, item 3118005, which does not require any additional modification.

The main bearings were designed to accept the original crankshaft bearings and oil seals (not supplied). The

V-One can be equipped with the original Dell’Orto Si 24-24 carburetor; in particular, the assembly of the mixer is easy and made possible by the dedicated support pin, included and supplied already assembled. The original crankshaft or our rotary valve crankshaft with 57 mm stroke, item 5317510, can be used. Regardless of the choice, however, the supply has been revised and implemented thanks to our modern CAD systems that have profiled an optimized intake duct in the crankcase.

Malossi decided it was time to break with the past to create an iconic component for an equally iconic vehicle like the Vespa PX 80/125/150. Leveraging all the technology and knowledge acquired on the roads and tracks of the world, Malossi has developed the new crankcases V-One and VR-One. The design, study, research and production of these crankcases are the ways in which Malossi seeks to pay homage to the fans of these vehicles. The two models allow mechanics, restorers and, in general, all owners of a Vespa PX 80/125/150 to choose the modification route that best suits their needs:

• The enthusiast, the restorer, the traveler, everyone is looking for a component that is capable of perfectly replacing the original, that does not require any modification to the vehicle and that offers the maximum choice in terms of components. The V-One SPORT crankcase will be compatible with both traditional components and the main items currently on the market




• The mechanic in search of maximum performance, the best internal fluid dynamics and the greatest possibility of engine development will be able to purchase the crankcase VR-One MHR

Technical characteristics

The technical and technological advancement of Malossi is the greatest strength of our products, the reason why we are convinced we have created one of the best crankcases ever produced.

Puntos fuertes

An innovative twist is evident in every square millimeter of the crankcase, which stands out clearly even to the least experienced mechanics. The permanent gravity mold casting, which differentiates these crankcases from the original models, obtained instead with a die-casting process, in combination with the use of modern shell molds, results in better internal shaping, created with maximum precision.

Using gravity casting we were able to strategically increase the sections in the most stressed areas and subject the crankcases to an improvement treatment after casting, thus obtaining extremely high mechanical resistance. These products are made of a high-quality Al Si 7 Mg aluminum alloy (EN AB and AC 42000) containing in the appropriate quantities: Silicon, to increase mechanical resistance; Manganese, to improve elasticity and corrosion resistance; and also Copper and Magnesium, to improve overall workability.

The processing of the crankcases is carried out entirely in our workshop using CAD/CAM processes and takes place within high-precision CNC machining centers. All support and sealing surfaces have been worked with diamond tools that are able to guarantee very low surface roughness values and practically perfect couplings.

Advantages

Both crankcases share a series of basic features, such as the front arm reinforced with ribs for stress relief and sections with a calculated profile to allow correct flow and stress channeling and ensure a higher level of resistance.

Both models include rods for the brake shoes, which are installed directly at the company with presses capable of applying the forces necessary to create the couplings required by our designers.

In addition to the brake blockers, the crankcases are supplied with the M7 studs necessary for mounting the gear selector.

Finally, all versions include the original electric starter, whose actuator can be mounted on the corresponding plane formed in the volute.

The mounting of the crankcase on the vehicle does not require the purchase of any additional components, in fact, both versions are equipped with both a front Silent Block on the connection arm to the body and a rear anti-vibration device connected to the shock absorber.

Fluid dynamics has finally been implemented! As our standard models are equipped with transfer ports properly profiled and sized for a perfect coupling to our Ø63 cylinders, however, without excluding the possibility of mounting other thermal groups and even offering an increase in performance with the latter, mechanics are therefore not forced to work the crankcases to assemble higher performance cylinders. The M7 studs for cylinder mounting are also included in the package!

Thanks to the interventions listed, reaching higher powers is no longer a problem. Even the usual problem of crankcase oil leaks has been solved through:

Increase of the pump crankcase walls, which also contributes further to the mechanical resistance of the crankcase

Use M8 bolts instead of the originals M7

Extremely precise processing of the sealing surfaces. We have eliminated the crankcase gasket, which deteriorated and became the main reason for oil leaks. Now the crankcases are perfectly matched and sealed using gasket paste, resistant even to the highest operating temperatures

But we didn't stop there! After years of assembling and disassembling original crankcases, working on them and testing thousands and thousands of solutions with the goal of proposing constantly updated components, we encountered firsthand inefficiencies and problems that we analyzed to then propose our solutions: this is the case of the crankcase fastening system which in the original components is created with the classic bolt-nut system, notoriously uncomfortable and not user-friendly.

Such a precious vehicle deserves the best possible maintenance and this implies the need to assemble and disassemble the various components to replace them or even just to check for correct operation, servicing them when necessary. Anyone who has had to deal with the original crankcases without disconnecting the block from the vehicle will certainly have encountered difficulties in handling the components that make up the block due to the uncomfortable and inaccessible position of the nuts which, once unscrewed, tend to fall to the ground and get lost somewhere. Our solution is as simple as it is sophisticated: do away with the nuts!

By creating threads in the left crankcase (or transmission crankcase) and seats on the right side (or ignition crankcase) we have eliminated the need to have nuts to tighten the two components. To prevent the screw from being hit accidentally and avoid damage during operation, with the risk of damaging the thread, wherever possible we have created seats on the right side that allow for a complete countersinking of the screws, thus placing them out of any danger.

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Products reserved exclusively for competitions in places specifically designed according to the provisions of the competent sporting authorities. We decline all responsibility for improper use