O.S.SPEED B21 ADAM DRAKE 4 - 3.5cc Off-Road Buggy Racing Engine
Main changes (compared to AD3):
- Cylinder liner: Revised port-design for more torque.
- Crankshaft: Inner diameter has changed for better low to mid end power.
- Outer head: Extra fin for better cooling, reduced weight, lower center gravity for better balance and new laser design with double anodized colors.
First deliveries are expected in December 2025.
Specs:
- Displacement: 3.49cc
- Bore: 16.4mm
- Stroke: 16.55mm
- Output: 2.65ps / 2.61hp @ 34.000RPM
- Practical RPM range: 4.000-42.000
- Engine Weight: 350g
