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OS MAX-21XR-B VER.3



O.S. Engines have announced the soon release of their new 21XR-B Ver.3 3.5cc nitro engine. The sports engine incorporates the DNA of the ultra-successful O.S.Speed line, transplanted into a more budget-friendly package for the average racer. A newly designed crankshaft will improve engine response thanks to a different shape and timing while a more lightweight piston further assists with a crisp engine response on throttle input. The OSSpeed-style conrod will offer exceptional durability while a redesigned combustion camber insert optimises power supply especially in the low to medium RPM range while offering stable engine performance at high speeds. Other features include a redesigned cooling head, the engine uses the double adjustment 21 J3-1 carburettor and it comes with 6mm off-road and 7mm GT specific venturi inserts.

Specifications:

  • Displacement: 3.49cc
  • Bore: 16.27mm
  • Stroke: 16.8mm
  • Practical RPM: 4,000-40,000
  • Maximum output: 2.45ps/33,000RPM
  • Weight 381g
  • Standard equipment: T-P3 glow plug, orange 6mm venturi, yellow 7mm venturi, exhaust seal

 

 
 

990 Lei


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