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COOLING HEAD
The MXR is equipped with the same cooling head as its predecessors (MXS, MTS). This 8-fin cooling head has a very low center of gravity and has been designed to focus most of the airflow directly to the glow plug. By cooling the glow plug we get a more stable carburetion and idle.
CARBURETOR
Once again, the MXR comes with the 21 J3 carburetor. Unlike the original OS carburetor, its high-speed needle holder was redesigned for a better refrigeration of the fuel flow into the carburetor, lowering the temp of the carb, and consequently it is more stable with a great idle stability, improves fuel mileage and overall engine performance.
Besides this, the uniball joint of the carb slide was also modified with two stoppers instead of one. With this new modified design, you can easier adjust the angle of the uniball joint without having to disassemble the engine.
This carb offers a higher accuracy tuning, a very interesting advantage to experienced drivers.
BACKPLATE
Same as in the MXS, the MXR backplate has been modified. The backplate is CNC machined and made of 7075-T6 Swiss Aluminum. It has been milled to improve the gas flow going to the piston and improving engine efficiency and performance.
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.
CRANKSHAFT
The crankshaft of the MXR is an evolution of the DLC B2102 but with two balanced tungsten in order to increase the inertia to rotation.
BEARINGS
The MXR comes with the original OS ceramic bearing in the rear and Ultimate Racing steel double sealed in the front.
VENTURI
The MXR comes with the 6.5mm Ultimate Racing FLOWMAX venturi. With an innovative design, longer than the standard O.S. venturis and wider at the base, unlike all others, makes the inferior part of the venturi and the carburetor have exactly the same diameter. This new geometry improves fluid dynamics, providing extra power that allows the use of smaller venturis without decreasing power, and as a consequence improves fuel mileage.
SLEEVE AND PISTON
Starting from the great base of the MXS, the sleeve of the MXR has been modified, modifying the ports to be able to vary the inlet and exhaust timing to achieve more power without compromising fuel consumption.
The sleeve with 3 inlet port and an exhaust port guarantees a low fuel consumption with a very high but smooth and linear power.
Both, the sleeve and piston are made from a high strength aluminum bar to improve its durability.
TECHNICAL SPECIFICATIONS
Displacement: 3,49 cc
Power Output: 2.65 PS/2.61 hp @ 34,000 rpm
Practical Range RPM: 4,000 - 42,000 rpm
Bore x Stroke: 16,40x16,40mm
Sleeve: 3 + 1 ports
Rear Ball Bearing: ceramic
Front Ball Bearing: steel
Crankshaft: 14 mm
Carburetor: 21 J3
Glow plug: P3 Turbo
Exhaust Position: rear
Fuel type: Recommended Nitrolux Energy3 16%-25%.
PIPE AND HEADER
This is the Ultimate Racing Super Strong EFRA 2141 exhaust system. This EFRA 2141 hi-quality aluminum exhaust has been designed to improve the overall performance of your engine. It produces a precise and linear throttle response in the low to mid RPM range with a great top end speed. This pipe set will provide great power to your engine up to the high RPM range to produce a great and easy to drive power curve. All these characteristics will provide great torque for those very demanding tracks with sharp corners and hard to clear jumps. This EFRA 2141 exhaust system is a great choice for your 1:8 off road engine, and it’s specially recommended for the M3R, M3X, M4R and M5 Ultimate engines This exhaust system includes the pipe, the manifold, 3 short springs, 2 medium springs, 1 long spring and 2 manifold gaskets.
Wallie builds is the top option for any racer looking to have the best available car at the track. These kits are built to be winners and give you the best opportunity for wins and podiums.
- Wallie Builds will cover shipping charges to anyone in the US.
- Once the sale leaves beachRC and arrives at Wallie Builds we will take full responsibility for the order.
- Anything with the build will be handled by Wallie Builds.