O.S. Engines have introduced the new R2104 on-road nitro engine for 1/8 cars. The factory tuned engine features a new 9-port liner and piston design to improve torque in low-middle power range. It produces enough power even in high traction tracks. The redesigned crankshaft counter weight allows smooth power transition from low to top. Distance of each fin of the heat sink head is enhanced for better air flow for cooling and better balance. The heat sink head is anodized in black with some red detail. The O.S. Speed R2104 engine is available as engine only or including the T-2080SC exhaust and a new manifold MR02 that improves air flow.
Source: O.S. Engines