OS Speed B21 Adam Drake 4 (AD4)

OS SPEED B21 ADAM DRAKE 4: The Champion's Evolution (AD4 Edition)

🏁 Power and Control: The Fourth Generation of a Legend

The OS Speed B21 Adam Drake Edition 4 (AD4) engine represents the latest collaboration between legendary driver Adam Drake and O.S. Engines engineers. Designed to dominate in 1/8 Nitro Buggy and Truggy categories, this engine further refines the winning formula of its predecessors.

The AD4 version introduces key improvements: a newly designed 3-port liner to increase torque, a crankshaft with optimized balancing to improve low-to-mid RPM response, and a lighter cooling head with a distinctive two-tone design.

⚙️ Edition 4 New Features

• New Liner and Piston: Retains the semi-long stroke configuration (16.55mm) but with a redesigned exhaust port to optimize gas flow and generate more usable power.
• Modified DLC Crankshaft: The crankshaft features DLC coating to reduce friction and a new inner diameter that improves power transition.
• Lightweight Cooling Head: New fin design with double anodizing (Black/Blue) that reduces weight, lowers the center of gravity, and improves cooling during long finals.
• Combustion Chamber (Inner Head): Redesigned with an O-Ring to reduce vibrations and prevent fine dust ingress.

Technical Specs (AD4)

📦 Box Contents

• OS Speed B21 Adam Drake 4 Engine.
• P3 Turbo Plug (Gold).
• 6.0mm Reducer (Blue).
• 8.0mm Reducer (Blue).
• Exhaust gasket and dust caps.