RUDDOG Racing RNX.4 .21 Offroad Competition Engine
RUDDOG Racing has announced its latest offroad engine offering with the new .21 competition spec RNX.4. Building on the success of its predecessor, the RNX22.3, the RNX.4 has been developed in collaboration with top racers including Marcus Kaerup who ran a prototype stage version of the RNX.4 at the 2024 World Championships in Redovan, Spain, where he secured a place in the A-Main. This latest version features significant improvements in runtime, drivability, and durability, ensuring maximum efficiency and consistency on the track. At the heart of the RNX.4’s improvements is the newly designed DLC-coated crankshaft, which increases durability, and improves fuel flow efficiency for a more responsive and consistent power band. In addition, the optimised internal engine head is specifically designed for the different nitro percentages of fuel used in the EU and international markets, ensuring maximum performance and reliability in racing conditions. Further enhancements include the Revolution Design Ultra Backplate, which improves fuel flow and efficiency, delivering extended runtime and smoother throttle response. Another premium addition is the Revolution Design Ultra Carburetor Dust Cover Seal, enhancing the carburetor’s sealing to protect against dust and debris, prolonging engine life, and ensuring consistent performance in harsh racing conditions.
Features
Based on the proven RNX22.3 engine platform
Prototype-tested at the 2024 World Championships by Marcus Kaerup
Newly designed DLC-coated crankshaft for reduced friction and improved durability
Optimized inner engine head in two variants for 16% and 25-30% nitro fuel to maximize performance and reliability
Revolution Design Ultra Backplate for improved fuel efficiency and longer runtime
Revolution Design Ultra Carburetor Dust Cover Seal for better carburetor protection and durability
Optimized power curve for increased drivability and control
Enhanced fuel economy for longer stints between refuels
Includes RUDDOG engine bag for safe storage and transport
Source: Ruddog [ruddog.eu]
