OS1CH00 OS SPEED B21 ADAM DRAKE EDITION II
This is the competition nitro engine OS Speed B21 ADAM DRAKE EDITION II realized with the collaboration of Adam Drake.
This new edition comes with a new design cylinder liner with new porting and a new design crankshaft with double tungsten counterweight. The new bore x stroke is designed with Adam Drakes's requirements in mind. This OS engine includes some carburetor reducers (6.5mm and 8.0mm) to suit both powerful drive and fuel economy drive OS SPEED 5. P3 GOLD plug is used for more consistent idlin
Drake model that was born with the advice of world-class pro-racer Adam
Drake from USA.
Features:
- The Bore/Stroke ratio of the Drake-spec engines is 16.4x16.55mm and are unique to this engine (and it’s processor).
- Newly designed crankshaft for further improved driving feeling (different tungsten balancing).
- New updated combustion chamber that use an additional O-ring which reduce vibration and seals out most of the dirt that can accumulate around the sleevsd upper/outer edge.
- The new carburetor also has its locking screw turned around 90 degrees so its much easier to reach/tighten.
- Two carburetor venturi inserts are included: 6.5 & 7.0 mm
- Also available as a combo set including an exhaust system
Specifications:
- Stroke volume: 3.49 cc
- Bore: 16.4 mm
- Stroke: 16.55 mm
- Output: 2.61 hp @ 34.000RPM
- Practical RPM Range: 4.000 - 42.000
- Weight: 353 g
