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O.S. Speed R2101 & 21XZ-B VII Engines

1/8-scale competition on-road & 1/8-scale competition buggy engines

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Two methods for serious performance boost of your race rides from O.S. Engine!

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

  • Performance that rivals that of the acclaimed Speed 21XZ-B Spec II
  • Shares the same piston, liner and con rod as the Speed version
  • Lightening holes in the cylinder head reduce overall weight
  • Other enhancements include a lower CG and improved cooling
  • A 22B2 single needle carb makes tuning a breeze
  • Optimized power band
  • Silicone filled crankshaft with tungsten counter weights
  • Blue anodized head
  • Incredible throttle response
  • 7 mm carb reducer is included

KEY FEATURES OF SPEED R2101

  • Shares many of the 21XZ-Bís 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.

SPECIFICATIONS
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)
PRACTICAL RPM:4,000-45,000 4,000-45,000
POWER OUTPUT:2.7 hp @ 33,000rpm 2.7 hp @ 34,000rpm
WEIGHT: 11.99 oz. (340g) 12.77 oz. (362g)
ITEM NO.:OSMG2043 OSMG2053
PRICE:$499.99 $319.999

Learn moreóO.S. ENGINE!

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Last edited by Paul Onorato; Mar 04, 2014 at 11:20 AM..

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Old Mar 28, 2014, 12:34 PM
Paul Onorato's Avatar
United States, CT, Brookfield
Joined Jun 2013
2,110 Posts
VIDEO - O. S. 21XZ-B VII engine

Check out this informative video about the O. S. 21XZ-B VII engine which helps illustrate why this engine is so good.

O.S. 21XZ-B V2 1/8 Scale Buggy Engine (1 min 20 sec)
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Old Apr 08, 2014, 12:50 PM
Paul Onorato's Avatar
United States, CT, Brookfield
Joined Jun 2013
2,110 Posts
VIDEO of the O. S. Speed R2101

Cool little video on the O. S. SPeed R2101 engine.

O.S. Speed R2101 (1 min 16 sec)
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Old Apr 09, 2014, 03:08 AM
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10x8's Avatar
Australia, NSW, Petersham
Joined Sep 2005
1,252 Posts
Awesome.

Still have O.S. powered .21 machines., on and off road. Never miss a beat, start first time and tune easy. Remind me of Honda.
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Old Apr 09, 2014, 09:42 AM
Paul Onorato's Avatar
United States, CT, Brookfield
Joined Jun 2013
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Quote:
Originally Posted by 10x8 View Post
Awesome.

Still have O.S. powered .21 machines., on and off road. Never miss a beat, start first time and tune easy. Remind me of Honda.

No doubt, you can definitely rely on an O. S. powerplant.
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Old Apr 14, 2014, 04:22 AM
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i think so,No doubt, you can definitely rely on an O. S. powerplant. thank you
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Old Apr 14, 2014, 09:34 PM
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jhazz138's Avatar
United States, MN, Andover
Joined Nov 2013
268 Posts
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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Old Apr 14, 2014, 10:06 PM
Paul Onorato's Avatar
United States, CT, Brookfield
Joined Jun 2013
2,110 Posts
Quote:
Originally Posted by jhazz138 View Post
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?
Yes absolutely. O.S. Engine is a trusted and high-quality engine manufacturer.
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