June 14, 2019

Ultimate Racing M3X V2.0 nitro off-road engine

Modelix Racing have announced the release of the new Ultimate Racing M3X V2.0 3.5cc nitro off-road engine. Like its predecessor M3X, the V2.0 is based on the square stroke O.S. Speed B21 Ty Tessmann II edition engine. The engine has been specifically designed for maximum power, performance and tuneability while offering super smooth linear power over the whole RPM range. The carburettor, crankcase and crankshaft have been developed to improve fuel consumption while the cooling head has been redesigned by Modelix. It is not as low as the B2102 lower profile but it is lighter so it keeps the centre of gravity as low as the B2102 while improving its performance in very high temperatures. Unlike the previous M3X, the V2.0 comes with the 21 J3 carburettor. Its high-speed needle holder has been redesigned for a better fuel flow cooling, lowering the temp of the carb, offering improved idle stability, fuel mileage and overall engine performance. In addition, the uniball joint of the carb slide has also been modified with two stoppers instead of one. With this new modified design, racers can easier adjust the angle of the uniball joint without having to disassemble the engine. Also the original design of the O.S. backplate has been modified. It has been milled to improve the gas flow going to the piston and the backplate now is made of 7075-T6 Swiss aluminium to improve durability of both the conrod and backplate. Thanks to its design, you can remove the backplate without damaging the conrod even when it is on its lower position (PMI). The lateral grooves allow to easily remove the backplate without having to use any tool that can damage it.

The crankshaft selected for the V2.0 is of B2101 specification to increase the power at low RPM. The crankshaft has been designed to ensure an optimised fuel flow thanks to the aerodynamic design and the silicone filling while tungsten balancing ensures high efficiency. The crankshaft spins in two Japan-made bearings and the engine comes supplied with a 6.5mm aluminium venturi. Last but not last comes the 3+1 port sleeve that makes for low fuel consumption and very high but smooth and linear power supply.

– Displacement: 3.49 cc
– Power output: 2.61 hp @ 34,000 rpm
– Practical range RPM: 4,000 – 42,000 rpm
– Bore x stroke: 16.40 x 16.40mm
– Sleeve: 3 + 1 ports
– Rear ball bearing: steel
– Front ball bearing: steel
– Crankshaft: 14 mm
– Carburettor: 21 J3
– Glow plug: P3 Turbo
– Exhaust Position: rear
– Fuel type: 25% nitro

Source: Modelix Racing [modelixracing.com]


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