Ultimate Racing MXR Ceramic 3 Transfer .21 Offroad

Spanish based brand Ultimate Racing has launched their new MXR Ceramic 3 Transfer .21 Offroad Competition Engine.  Like its predecessor the MXS, this engine is manufactured by the prestigious Japanese brand O.S. Engines and in this case based on their square stroke Speed B21 engine.  Apart from the modifications that the MXS already had, such as the crankshaft and back plate, the sleeve of the MXR has been modified, modifying the ports to be able to vary the inlet and exhaust timing.  The inner head has also been modified and includes the innovative FlowMax venturi to improve performance, more specifically, to achieve greater power without compromising fuel consumption. This engine provides a really good power band with a ton of usable power.  It has a smooth bottom end which worked well on the bumpy track and then has a lot of mid-range pop and feel to it.  This engine is also available as Team Edition (broken in) and Combo with both, the 2141 and the 2142 pipes.

Source: Modelix [modelixracing.com]