O.S.Engines B21 Adam Drake 4 Off-Road /T2090 Combo

O.S.SPEED B21 ADAM DRAKE 4 - 3.5cc Off-Road Buggy Racing Engine - With T2090 Exhaust

O.S. Engines would like to introduce new O.S.SPEED B21 ADAM DRAKE 4. The latest collaboration engine with world famous O.S. Team driver Adam Drake.

The cylinder liner, crankshaft & cooling head has been redesigned to Adam Drake’s spec for better balance, more torque and more power for better driving performance.

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.
Combustion chamber: Redesigned for more torque
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: 352g

Included:
T2090 Exhaust Set: TB02 EFRA2089 Pipe & MB01-75 manifolder
Glowplug: O.S.SPEED P3
Reducers: 6II (blue) AL2 & 8mm (blue) AL
Exhaust seal ring
Dust cap set: 3/16/18mm