Cylinder VMC Thug 144 ccm aluminum, direct intake for Vespa PV125 and ET3
Modern aluminum cylinder with direct intake for anyone looking for a powerful smallframe engine suitable for touring with clean power delivery.
The VMC Thug 144 is designed as a modern smallframe cylinder for riders who want to build a fast and powerful street engine without going straight into a completely extreme high-rev concept. Its basic character is clearly designed for fast touring: powerful from below, easy to ride on long distances and at the same time with sufficient technical reserves for later expansion stages. This is exactly what makes the Thug so interesting. It is not a nervous special part, but a very good basis for powerful PV and ET3 engines suitable for everyday use.
VMC
Thug 144
60 mm bore
aluminum
Direct intake
Fast Touring
What makes the VMC Thug so special
144 cc with 51 mm stroke: plenty of displacement for powerful acceleration and good pulling power
Aluminum cylinder: much more thermally stable than classic cast iron concepts
Direct intake with diaphragm: modern intake control instead of classic rotary valve housing
Basic character suitable for touring: strong bottom end, clean rideability and suitable for long distances
Fast touring instead of the old cast iron school
VMC expressly positions the Thug as a modern further development of classic sporty smallframe cylinders. The move to aluminum and reed valve intake brings precisely the advantages that are appreciated today in a powerful street engine: more stable thermals, clean mixture control and an overall wider usable band. The result is an engine that rides much more maturely on the road than many older concepts.
Timing and technical basis
Timing: approx. 124° / 184°
Ducts: 6 transfer ports and 1-piece outlet
Stud bolt spacing: 56 mm
Exhaust connection: 32 mm
Gilardoni NiKaSil as a strong base
A real asset of the Thug is the NiKaSil-coated raceway from Gilardoni. This stands for high thermal stability, low friction and very constant conditions, even when the engine is under constant strain on longer stages or in summer temperatures. This is precisely what makes the cylinder particularly interesting for fast tours.
Direct intake with large reed pack
The Thug works with a large diaphragm pack in the style of the Yamaha RD350, giving the intake side a clearly modern design and providing a very good basis for stable carburetor tuning and clean filling.
Direct intake on the cylinder
Large reed valve package: RD350 type
Intake manifold: for 28 to 30 mm carburettors included in the scope of delivery
Silicone hose included: reinforced version with fabric insert
8-fold bolted head
The cylinder head is held in place not only by the four classic stud bolts, but also by four additional bolts. This 8-fold screw connection significantly increases the stability of the composite and helps to prevent leaks or distortion in the heavily loaded area.
Important note on installation
For installation on Piaggio housings with 51 mm stroke and 97 mm connecting rod, the cylinder mount in the engine housing must be turned out to a diameter of 64 mm and a depth of approx. 8 mm so that the cylinder sleeve can be inserted cleanly into the housing.
VMC supplies a steel guide for this purpose, which is screwed to the cylinder stud bolts. This means that this work can also be carried out cleanly by hand with a milling cutter.
Well thought-out scope of delivery
The Thug is not supplied naked, but as a well-prepared kit. In addition to the cylinder and head, the essential parts for the intake side and assembly are also included. This simplifies assembly considerably and also makes the cylinder interesting for ambitious mechanics who do not want to search for every detail individually.
| Cylinder | Aluminum, NiKaSil-coated from Gilardoni |
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| Head | 8-fold bolted |
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| Intake manifold | 28/30 mm, plug-in connection |
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| Connection | High-quality silicone hose with fabric insert |
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| Seals | Complete set of seals included in the scope of delivery |
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| Milling aid | Steel guide for processing the housing holder |
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Frame and installation environment
VMC specifically names the Thug for classic smallframe vintage frames such as Special 50, ET3, Primavera and 50 N/L/R. In addition, the cylinder is designed so that it can be mounted on Vespa 50 and Ape 50 housings without having to remove the half-moon dust cover. It is also compatible with fan wheels and starter ring gear.
Brief technical overview
| Manufacturer: VMC | VMC |
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| Type | Thug 144 |
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| Bore | 60 mm |
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| stroke | 51 mm |
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| Displacement | 144 cc |
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| Type of construction | Aluminum, direct intake |
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| Coating | Gilardoni NiKaSil |
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| Transfer port | 6 |
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| Outlet | 1-piece, 32 mm connection |
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| Control times | approx. 124° / 184° |
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| Intake | Direct intake, large reed pack |
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Conclusion
The VMC Thug 144 is a modern smallframe cylinder with a very attractive concept: aluminum instead of cast iron, direct intake instead of the old rotary valve routine and a design that is clearly aimed at powerful, fast touring operation. If you want to build a powerful, easy-to-ride PV or ET3 engine and are looking for a modern technical basis, this is a very interesting cylinder with a lot of potential.
FAQ about the VMC Thug 144
The Thug is clearly designed as a powerful touring cylinder with a sporty reserve. Plenty of bottom-end torque, easy to ride on longer routes and still a strong basis for later upgrades.
Yes. For Piaggio housings with 51 mm stroke and 97 mm connecting rod, the cylinder mount must be machined to a diameter of 64 mm and a depth of approx. 8 mm.
An intake manifold for 28/30 mm carburetors is included in the scope of delivery.
The raceway is coated with NiKaSil from Gilardoni. This ensures high thermal stability, low friction and a very good basis for a durable road engine.
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