O.S 13646 .21VG(P) ES w/New 21F Carb
This is the O.S. Max 21VG (P) ES Electric Start, Rear Exhaust Monster Truck and Buggy Engine with the 21F Slide Valve Carburetor.
Excellent mid-range power for 1/8 scale buggies and trucks to compete in ROAR sanctioned events.
Features
O.S 13646 .21VG(P) ES w/New 21F Carb
Preinstalled E.S. Starter backplate is designed to use the Duratrax Kwik-Pit Super Start for the HPI Savage or the HPI Roto Starter System (HPIP8711)
Advanced Bi-Metallic Liner (ABL) cylinder liner construction This process uses a double layer of plating material rather than one thick layer. This helps the metal bond to the cylinder and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve for better compression and longer life.
Machined aluminum piston, 3-port cylinder liner and double bushed knife edge connecting rod
21F two needle slide valve carburetor with insulated sleeve to
prevent fuel vaporization
SG (pilot) type one-piece crankshaft
Two year limited warranty through manufacturer
Specifications
Displacement: 0.211 cu in (3.46cc)
Bore: 0.654" (16.6mm)
Stroke: 0.63" (16.0mm)
Practical RPM: 3,000-36,000
Power Output: 2.0 ps/30,000 RPM
Weight: 15.27oz (433g)
Crankshaft Size: 1/4-28
Factory Needle Valve Setting: 2.5 turns open from closed position
Mixture Control Valve Setting: Adjust so that carb is approximately
1mm open at idle
Metering Needle Valve Setting: Flush with the ball link body
Distance Between Mounting Holes Same Side: 21mm (.83")
Distance Between Mounting Holes Opposite Side: 37mm (1.5")
Height Bottom of Mounting Tabs to Top of Cylinder Head: 87.4mm (3.4")
Width of Mounting Tabs: 45mm (1.8")
Width of Crankcase Below Mounting Ears: 30.8mm (1.2")
Distance from Front Bearing to end of Crankshaft: 29.5mm (1.2")
Distance from Center of Engine to Front Bearing: 44mm (1.7")
Distance from Center of Engine to Backplate: 21.3mm (.84")
Contents
O.S. Max 21VG (P) ES Electric Start Monster and Buggy Truck Engine, 21F carb, illustrated manual, exhaust manifold seal, #8 glow plug, and preinstalled E.S. Starter backplate
Requirements
Duratrax Kwik-Pit Super Start System or the HPI Savage Roto Starter System (HPIP8711)
Car blend nitromethane fuel with 10-30% nitromethane content, 16% nitro content recommended as starting point
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.
Comments
Some notes on Slide Valve and Rotary Carburetors:
Rotary Carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied.
Slide Valve Carbs provide greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed.
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