O.S. Engine announces two new competition-grade engines for 1/8-scale on-road (Speed R2101) and 1/8-scale off-road (21XZ-B VII). The Speed R2101 brings together the benefits of the 21XZ-R and 21XZ-B into one engine purpose built for on-road duties. It features a specially developed 7+3 port cylinder liner that offers smooth acceleration, great power and improved economy. For improved fuel flow, the crankcase was redesigned and the DLC coated crankshaft comes with pressed-in weights and is silicone-ported. Topping it off is an awesome-looking, black anodized, machined aluminum cooling head finished off with the laser-etched Speed Tuned graphics. For you 1/8-scale off-road guys, the O.S. 21XZ-B VII gives you a competition-level engine at a more affordable price. O.S. engineers were able to make it lighter, lower and cooler running while still producing power similar to the Speed Spec II.
KEY FEATURES OF 21XZ-B VII
KEY FEATURES OF SPEED R2101
|ENGINE:||SPEED R2101||21XZ-B VII|
|DISPLACEMENT:||.213 cu. In. (3.49cc)||.213 cu in (3.49cc)|
|BORE:||.633 in. (16.08mm)||.641 in. (16.27mm)|
|STROKE:||.677 in. (17.2mm)||.661 in. (16.8mm)|
|POWER OUTPUT:||2.7 hp @ 33,000rpm||2.7 hp @ 34,000rpm|
|WEIGHT:||11.99 oz. (340g)||12.77 oz. (362g)|
Learn moreóO.S. ENGINE!
.Last edited by Paul Onorato; Mar 04, 2014 at 10:20 AM..
I am runing an O.S. in my savage. Its my first nitro and I have been succesfull runi.g and tuning it so without any help. Just read up and watched videos. Here's my question is O.S. considerd a "high end" brand? I know it comes down to prefrences and may vary depending on the aplication but is that the level this company is at?
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