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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.
| Parameter | Value |
|---|---|
| Displacement | 3.49cc / 0.213 cu.in. |
| Bore | 16.40mm |
| Stroke | 16.55mm |
| Output | 2.65 ps / 2.61 hp @ 34,000 r.p.m. |
| RPM Range | 4,000 - 42,000 r.p.m. |
| Weight | 352g |