OS Engine Speed 21XZ-B Spec III (L-OS1AN00)
The 21XZ-B Spec III is that latest evolution of the popular 21XZ-B racing engine from OS. OS are known worldwide for developing race winning 1/8th Off Road World Championship engines and this latest iteration is a result of constant refinement. Using the latest OS design techniques and technology lots of small improvements have added up to a noticeable step forward in performance. These improvements not only enhance the outright performance but also the drivability and usability in high pressure race situations.
• The Spec III has a long stroke for optimum torque
• Improved low-to middle-range torque for corner exits
• 3 scavenger ports and 3 exhaust port cylinder
• Reduced weigh head for a lower CG
• DLC-coated crankshaft with pressed-in tungsten weights
• 21J carburettor with 6.5 mm restrictor
Note:This engine does not include a tuned pipe or manifold.
| Specifications | |
|---|---|
| Glow Plug | Turbo P-3 Glowplug (Included) |
| Weight | 353g (12.45 oz) |
| Capacity | 0.213 cu.in. (3.49cc) |
| Bore | 16.27mm (0.641″) |
| Stroke | 16.80mm (0.661″) |
| Power Output | 2.61 hp (2.65 ps) @ 34,000rpm |
| Practical RPM | 4,000 – 42,000 |
