O.S. SPEED R21 Eurospec 3 Nitro On-Road Engine

** Available to special order. Estimated Lead time on delivery 1-2 weeks **

O.S. SPEED R21 Eurospec 3 Nitro On-Road Engine

OS-1FP00 O.S. SPEED R21 Eurospec 3 Nitro On-Road Engine

The O.S. SPEED R21 EURO 3 Combo Set is the definitive competition package engineered to dominate international 1/8 on-road racing circuits. Serving as the direct evolution of the championship-winning EURO II, this factory-matched set pairs the newly developed R21 EURO 3 powerplant with the race-proven TR03 (EFRA2196) tuned silencer and MR05 exhaust manifold for maximum performance right out of the box.This new powerhouse features a 9-port cylinder liner with redesigned ports, delivering enhanced performance.

Features:

• New 7-Port Cylinder Liner: Engineered with refined port profiles for explosive low-end punch and extended top-end over-rev.

• Specially Treated Piston: Advanced surface treatment drastically reduces frictional resistance and prevents micro-seizures under heavy loads.

• Precision Counterbalanced Crankshaft: Integrated tungsten counterweights deliver smooth rotational acceleration and crisp throttle response out of tight corners.

• Ceramic Rear Ball Bearing: Lightens rotational mass and reduces internal friction for lightning-fast RPM transitions.

• High-Efficiency Heatsink Cooling Head: Redesigned aerodynamic cooling fins deliver stable operating temperatures throughout grueling 45-minute main finals.

• Carburretor Dust Cover Ring: Protects against dust ingress and prevents fuel weeping around the carburetor linkage boot.

Specification:
Displacement： 3.49 cc / 0.213cu.in.
Bore: 16.08mm / 0.633 in.
Stroke: 17.20mm / 0.677 in.
Output :2.80 ps / 2.76 hp / 35,000 r.p.m.
practical rpm range: 4,000-45,000 r.p.m.
Engine Weight:337g / 11.89 oz.

Included Items:
1x O.S Speed R21 Eurospec 3 Nitro Engine, 1x T-RP7 Glow Plug, 8.5mm Carburettor Reducer, 2x Exhaust Seal/Gasket's, Dust Cap Set 12-30 (1x 3mm、1x 16mm、1x 18mm).