OS SPEED B21 ADAM DRAKE 4 COMBOSET

The O.S. SPEED B21 Adam Drake Edition 4

is a high-performance .21 (3.5cc) nitro engine for 1/8 scale off-road RC buggies and trucks, a collaboration with legendary driver Adam Drake, featuring redesigned cylinder/piston for more torque, a DLC crankshaft with tungsten weights, a new two-tone cooling head for better cooling and lower center of gravity, and enhanced low-to-mid-range response for competitive racing.

Key Features:

• Engine Type: .21 (3.5cc) Nitro, Semi-long stroke.
• Performance: High torque, improved mid-range response, low fuel consumption.
• Cylinder Liner: New 3-port design with revised porting for better power delivery.
• Crankshaft: DLC coated, with double tungsten weights for smoother rotation and better balance.
• Cooling Head: Tall, lightweight black head with blue anodized accents (Adam Drake's signature color) and a silicone O-ring for efficient cooling and a lower center of gravity.
• Carburetor: 22E with included 6.5mm and 8.0mm (or 7.5mm) venturis for tuning.
• Rear Cover: Features pressure surfaces to reduce connecting rod wear.
• Bearings: Ceramic rear bearing.

• Displacement： 3.49ccm
• Bore: 16.4mm
• Stroke: 16.55mm
• Output: 2.65 ps - 34,000 r.p.m.
• Practical r.p.m.Range: 4,000-42,000 r.p.m.
• Weight: 352g