O.S. Speed Adam Drake 4 (AD4) Engine/75mm Header/TB02-2090SC Pipe Combo Set(Drake In Service Done) - OS-1FH01D

🏁 Adam Drake Edition 4 — Engine & Pipe Combo Overview

The O.S. SPEED B21 Adam Drake Edition 4 (AD4) Combo Set combines the newest evolution of Adam Drake’s signature .21 engine with the race-proven TB02-2090SC tuned pipe and 75mm header, delivering a complete performance package engineered for serious 1/8 buggy competition.

Co-developed with world-renowned racer Adam Drake, the AD4 features a newly refined 3-port cylinder liner with optimized port geometry for smoother power delivery and more efficient combustion. A revised crankshaft bore enhances low–mid range throttle response, providing exceptional drivability in the most demanding track conditions.

Paired with the 2090SC pipe and 75mm header, this combo delivers crisp throttle response, increased top-end speed, and improved overall powerband efficiency. The striking two-tone cooling head features Adam Drake’s signature blue anodizing with an updated laser-etched design, giving the engine both performance and premium visual appeal.

Features:

• Complete engine + pipe combo for maximum performance
• Refined 3-port cylinder liner with improved port timing
• Modified crankshaft bore for enhanced low–mid power
• Two-tone anodized cooling head with Drake signature blue
• Updated laser-etched head design
• TB02-2090SC tuned pipe for high-efficiency power output
• 75mm header optimized for smooth, controllable power band
• Ideal for high-competition 1/8 nitro buggy applications

Engine Specifications:

• Displacement: 3.49cc / 0.213 cu.in.
• Bore: 16.4mm / 0.646 in.
• Stroke: 16.55mm / 0.652 in.
• Output: 2.65 ps / 2.61 hp @ 34,000 RPM
• RPM Range: 4,000–42,000 RPM
• Weight: 352g / 12.42 oz.

Includes:

• (1) O.S. SPEED B21 Adam Drake Edition 4 Engine
• (1) TB02-2090SC Tuned Pipe
• (1) 75mm Header
• (1) O.S. SPEED T-P3 Glow Plug
• (2) Carb Reducers (6mm & 8mm)
• (1) Exhaust Seal Ring
• (3) Dust Caps (3mm, 16mm, 18mm)

Part Number: OS-1FH01D