O.S. Engine 12XZ(P) Performance On-Road Engine  [OSMG1990]

Compact Competition Engine by O.S. Engine 12XZ

The O.S. Engine 12XZ targets 1/10 on-road racers who need a reliable, race-capable powerplant. Its construction reflects a focus on usable performance and durability under race conditions.

Optimised Torque and Driveability

Alterations to the crankcase and liner port profile improve torque delivery across the low and mid rpm range. That makes the engine more tractable when exiting corners and accelerating on shorter straights.

Design Highlights and Reliability

• Low-Friction Crankshaft: Surface treatment reduces internal friction and wear, and the silicone-filled crankshaft smooths induction for steadier running.
• Precision Balance: Tungsten balance weights help keep the engine running smoothly at higher revs.
• Optimized Cooling: The aluminium outer head is weight-reduced with machined openings to aid cooling during extended running.

Carburetor and Glow Plug Setup

The 12F(B) carburetor supplied with the engine is tuned to its characteristics, and the RP6 glow plug helps maintain consistent combustion throughout the practical operating range of 5,000 to 44,000 rpm.

The O.S. Engine 12XZ is a practical choice for club and national level competitors seeking a lightweight engine that balances torque, cooling, and straightforward tuning.