The O.S. SPEED DRAKE AD4 engine is a high-end solution designed for enthusiasts looking for exceptional performance. Developed in collaboration with American champion Adam Drake, this engine incorporates advanced technologies to offer an optimal driving experience.

Engine specifications:

• Displacement: 3.49 cm³
• Bore: 16.40 mm
• Stroke: 16.55 mm
• Power: 2.61 horsepower at 34,000 rpm
• RPM range * 4,000 to 42,000 rpm
• Weight: 350 g
• 21J carburetor

These specifications guarantee increased linear power and responsiveness, tailored to the demands of buggy and truggy racing.

Innovations and improvements:

• AD4 cooling head: Featuring an additional fin for improved heat dissipation, this cooling head helps maintain optimal operating temperatures, even during hot summer sessions.

• Cylinder design: The specific configuration of the AD4 cylinder optimizes engine torque, providing smooth acceleration and better handling on the track.

• DLC-treated crankshaft: The AD4 DLC crankshaft, with its new modified inner diameter, improves power at low and medium rpm, ensuring a more responsive and controllable ride.

• Glow plug insert with silicone O-ring: This design reduces vibration and prevents dust infiltration, extending engine life and maintaining consistent performance.

• AD-specific blue reducers (restrictors): Two venturis with diameters of 6 and 8 mm ensure efficient power transmission, optimizing responsiveness and smoothness.

• Backplate with pushplate: This innovation reduces friction against the connecting rod, extending its life and maintaining high performance over the long term.

• 16.8 mm long stroke configuration: This feature improves engine torque, providing smoother acceleration and better grip on different types of terrain.

• Ceramic rear bearing: This high-quality bearing ensures smoother rotation and increased durability, reducing wear and maintaining optimal performance.

Box contents:

• OS P3 Gold glow plug
• 6 mm venturi
• 8 mm venturi
• Exhaust gasket
• Set of dust plugs (3 mm / 16 mm / 18 mm)

The O.S. SPEED DRAKE AD4 engine represents the pinnacle of nitro combustion engine technology.

Its advanced technical features and specific innovations make it the preferred choice for demanding modelers seeking power, reliability, and precision in their performance.