Ultimate MXR v2 Ceramic DLC Nitro Engine | 3 Transfers Square Stroke

Ultimate MXR v2 Engine with Complete Ultimate Airmax Filter

The .21 3-port Ultimate MXR v2 Ceramic competition engine is a high-performance product designed by Ultimate Racing in Spain and manufactured in Japan by O.S. Engines, renowned for their excellence in RC engine production. Based on the successful O.S. Speed B21 engine, this second version of the MXR has been upgraded with significant improvements to deliver outstanding performance in competitions.

Recommended pipe: Ultimate EFRA 2141 One Piece
Recommended glow plug: O.S P3 Gold / O.S P3 Turbo
Recommended fuel: Nitrolux Energy3 Fuel 16%

Main Features:

• New! Crankcase: Improved internal fuel flow enhances power and efficiency.
• New! Filter: All MXR v2 engines include a full Ultimate Airmax filter set.
• Cooling head: Same 8-fin head as the MXS with a low center of gravity, designed to direct most airflow towards the glow plug for better cooling and more stable tuning and idle.
• Carburetor: Modified OS 21J3 for better stability and more precise tuning thanks to a high-speed needle with a cooling housing, reducing temperature and improving long-run efficiency.
• Venturi: New 6.5mm FlowMax venturi, longer and wider at the base than standard OS models, improves fluid dynamics for more power and better fuel mileage.
• Backplate: Redesigned red backplate made from Swiss 7075-T6 aluminum with larger channels to improve fuel flow, boosting power and efficiency.
• Sleeve and piston: Redesigned timing with new ports for more power without increasing fuel consumption.
• Bearings: Rear O.S. ceramic bearing and front Ultimate Racing steel bearing with double seal.

Technical Specifications:

• Displacement: 3.49 cc
• Power output: 2.65 PS @ 34,000 rpm
• Bore & stroke: Square 16.40 x 16.40 mm
• Sleeve: 3 + 1 ports
• Rear bearing: O.S Ceramic
• Front bearing: Ultimate Racing Steel
• Crankshaft: 14mm balanced with 2 tungsten inserts
• Carburetor: Modified O.S 21J3 with exclusive needle holder
• Glow plug: P3 Turbo
• Weight: 345g

Common Spare Parts for Ultimate MXR: