OSMG1CJ01-1 O.S. Speed B21 AD3 Adam Drake 3 Competition .21 Nitro Engine w/2100SC Pipe Broken In by Adam Drake

The O.S. Speed B21 AD3 Adam Drake 3 Competition .21 Nitro Engine is the latest evolution of the legendary B21 race engine, developed in collaboration with multi-time ROAR Champion Adam Drake. Engineered for competitive 1/8-scale nitro buggy racing, the AD3 delivers exceptionally smooth power, outstanding fuel efficiency, and championship-level performance.

This special OSMG1CJ01-1 version includes the O.S. 2100SC tuned pipe, 75mm manifold, and is professionally broken in by Adam Drake using his proven EBIS (Engine Break-In Service) oil bath process. The result is a race-ready engine with improved reliability, easier tuning, and consistent performance right out of the box.

Features

• Professionally broken in by Adam Drake using the EBIS oil bath process
• O.S. Speed B21 AD3 competition .21 nitro engine
• Includes O.S. 2100SC tuned pipe and 75mm manifold
• Updated crankcase design for smoother, more linear power delivery
• Redesigned cylinder liner with optimized port timing
• DLC-coated crankshaft with larger double tungsten counterweight
• Lightweight cooling head with a lower center of gravity
• Steel-lined rear cover plate for reduced friction and improved durability
• Ceramic rear bearing for long-lasting performance
• 21J carburetor for precise tuning
• Includes 6.5mm and 7.0mm anodized carburetor reducers
• O.S. Speed P3 Gold glow plug included

Specifications

• Displacement: 3.49cc (.21 cu in)
• Bore: 16.4mm
• Stroke: 16.55mm
• Output: 2.61 HP @ 34,000 RPM
• Practical RPM Range: 4,000–42,000 RPM
• Engine Weight: 350g (12.35 oz)

Package Includes

• (1) O.S. Speed B21 AD3 Competition .21 Nitro Engine (EBIS Broken In)
• (1) O.S. 2100SC Tuned Pipe
• (1) 75mm Exhaust Manifold
• (1) Engine-to-Manifold Gasket
• (1) O.S. Speed P3 Gold Glow Plug
• (1) 21J Carburetor
• (1) 6.5mm Carburetor Reducer
• (1) 7.0mm Carburetor Reducer