This is the O.S. 21VZ-B V-Spec Limited Edition Engine.

FEATURES: Hardened chrome-plated 3-port cylinder liner with three intake and
            one exhaust port
          Machined billet aluminum piston with parallel rings to trap fuel oils
            for complete lubrication between piston and sleeve, cutouts in
            side of piston for lighter weight
          Modified cooling head from the O.S. Speed II World Championship
            engine with machined holes for lighter weight and better cooling,
            gold colored anodizing
          Slide valve 21J carburetor with four separate adjustments, high-speed
            mid-speed, low-speed and throttle stop, also includes 8mm and 9mm
            restrictors for specific race conditions
          SG-style crankshaft constructed of hardened and machined steel, fuel
            chamber's exit point is chamfered to provide a smmoth path for fuel
            and air mixture
          Knife-edge connecting rod for reduced weight and drag

INCLUDES: 21VZ-B V-Spec Limited Edition Engine, glow plug, 21J carburetor with
            8mm & 9mm restrictors, manual, exhaust gasket and dust cap set

REQUIRES: #203 Air Cleaner Assembly, OSMG2360
          Exhaust System: T-2060SC WN tuned silencer (OSMG2938) developed
            specifically for this engine
          Fuel: 10-30% nitro content, 20% recommended for break-in
          Most of the fuels we carry meet or exceed the lubricant content
            required for optimum performance and maximum engine life. In the
            past, the conventional lubricant content used in fuel was 18%. But
            with new advanced technologies, fuels like Red Alert and O'Donnell
            for example, have a better quality of lubricants even though the
            percentages of lubricant content are lower. These high-tech
            lubricants provide exceptional cooling and protection.

SPECS:    Displacement: 0.21 cu in (3.46cc)
          Bore: 0.654" (16.6mm)
          Stroke: 0.630" (16.0mm)
          Practical RPM: 3,000-40,000
          Power Output: 2.48 hp @ 33,000
          Weight: 12.7oz (360g) without muffler
          Height from crankcase bottom to top of cylinder head: 110.6mm (4.4")
          Height/crankshaft center to top of cylinder head:      95.3mm (3.8")
          Width including mounting ears:                           45mm (1.8")
          Width not including mounting ears:                     30.8mm (1.2")
          Width between mounting holes same side:                  21mm (.83")
          Width between mounting holes opposite side:              37mm (1.5")
          Cylinder head diameter:                                57.2mm (2.3")
          Length of exposed pilot shaft/crankshaft:              29.6mm (1.17")
          Internal thread size at end of crankshaft:                3mm

COMMENTS: Turbo glow plugs do not require a copper gasket.
          With the carb restrictors, the driver can select either
            low fuel consumption or high power, allowing a wide range
            of engine control. Usage is as follows:
              8mm: Suitable for technical and bumpy courses and when less fuel
              consumption is more important
              9mm: Suitable for high-speed and flat courses that require power

          NEEDLE SETTINGS: These are pre-set from the factory and require
            little or no adjustment
          Needle Valve: 2.5 turns open from fully closed position
          Metering Needle - Rotate until slotted head is extruded by 0.5mm
            into ball link body
          Mixture Control Valve - Rotate until slotted head is flush with ball
            link body

                                                                   jxs 02/11/10



– If you need more information, use these O.S. resources –

E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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