If you like your nitro power mixed with foam tires and pavement, O.S. Engines’ latest mill is all you. The Speed R201 is based on the red-hot 21XZ-B Speed Spec II (as used by Ty Tessmann to win The Dirt Nitro Challenge), and tuned for high-revving road action. Full press info from O.S. below.
A BIG boost in performance for 1/8 scale on-road!
Take the winning heritage of the 21XZ-R, combine it with the 21XZ-B’s superb features and what do you get? The Speed R2101: the top choice for 1/8 scale on-road! Its specially designed 7+3 port cylinder liner ensures smooth acceleration, great power and improved economy. The DLC coated crankshaft comes with pressed-in weights and is silicone-ported. The crankcase is a new design that provides efficient fuel flow from intake to exhaust. Sporting laser-etched Speed Tuned graphics, the Speed R2101’s machined outer head results in improved cooling and a lower center-of-gravity.
– Shares many of the 21XZ-B’s extraordinary features, applied to competitive on-roading.
– Builds on the winning heritage of the 21XZ-R.
– Newly designed 7+3 port cylinder liner ensures smooth acceleration, great power at maximum rpm and improved fuel mileage.
– DLC coated crankshaft, pressed-in weights and silicone-ported.
Displacement: 0.213 cu in (3.49 cc)
Bore: 0.633 in (16.08 mm)
Stroke: 0.677 in (17.2 mm)
Practical RPM: 4,000-45,000
Output: 2.7 hp @ 33,000 rpm
Weight: 11.99 oz (340 g)