O.S. 21XZ-R Speed & 21XZ-R VII engines

O.S. have introduced two new 21XZ-R engines for 1/8 scale on-road racing with both featuring superb runtime. Engineered for added horsepower and faster lap times, the 21XZ-R Speed performed well at the 1/8 Scale On-Road Worlds in Miami, Florida with Team drivers coming home in 4th and 5th place with production models. The motor features a redesigned crankcase and carb to produce smoother transitions and higher speeds while the 21M slide-valve carb features 4 adjustable control settings, including a low-end metering needle for improved torque and fuel economy. A more-balanced conrod reduces vibration and wear. Equipped with many of the same performance features as the .21XZ-R Speed ABC, the 21XZ-R VII offers explosive acceleration and top-end for race-winning potential at a more economical price. It combines aggressive timing with easy starting so drivers can unleash its race-winning potential right out of the box, while the cylinder liner boasts 7 scavenger ports and three exhaust ports. Both engines are available in early August.

21XZ-R Speed Specifications:
Displacement: 3.49 cc (.212 ci)
Bore: 16.27 mm (.640 in)
Stroke: 16.8 mm (.661 in)
Practical RPM: 4,000 to 45,000
Power Output: 2.8 ps/2.84 hp/33,000 rpm
Weight: 338 g (11.9 oz)

21XZ-R VII Specifications:
Displacement: 3.49 cc (0.213 ci)
Bore: 16.27 mm (.640 in)
Stroke: 16.8 mm (.661 in)
Practical RPM: 4,000 to 45,000
Power Output: 2.8 ps/2.84 hp/33,000 rpm
Weight: 343 g (12.1 oz)

Source: OS Engines [osengines.com]