This is the O.S. Max Speed Tuned.21 VZ-B V-Spec2 Off-Road 1/8 scale
Racing Engine with Aluminum Heat Sink Head.
Ideal for Mugens, Infernos, and hybrid trucks.
****** Because of the expressed racing nature of this engine, ******
****** it is NOT covered by the O.S. 2 Year Warranty ******
****** per page 8 of manual. ******
FEATURES: V-shaped aluminum head with eighteen machined holes for lighter
weight and more efficient cooling
Hardened, chrome-plated, 4-port, cylinder and liner for
high durability and long life
Specially coated silicone filled crankshaft with precision ceramic
bearing that greatly reduces friction, plus a Tungsten weight for
for added balance
Machined piston features parallel rings that trap fuel oils
and use them as a seal to enhance compression and boost power
Reshaped crankcase core ensures smoother air flow and more consistent
performance
Slide Valve Carb with 7mm, 6.5mm and 6mm Carb restrictors with red
anodized finish allow tuning to specific track conditions, Low-
end Needle adjusts from side to side for maximum adjustment ease
INCLUDES: O.S. Max Speed Tuned.21 VZ-B V-Spec2 engine, 21JS , P3 glow
plug, 7, 6.5 and 6mm carb 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: Practical RPM Range: 3,000-40,000
Output: 2.5 ps @ 34,000 rpm
Displacement: 0.211 cu in (3.46cc)
Bore: 0.654in (16.6mm)
Stroke: 0.630in (16.0mm)
Weight w/o Muffler: 12.3 oz (349g)
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:
-6mm: Suitable for technical (narrow) and bumpy course when
less fuel consumption is more important.
-6.5mm: Suitable for high-speed and flat courses
that require power.
-7mm: Supplied with engine. Suitable for technical
and bumpy courses and when less fuel consumption
is more important.
NEEDLE SETTINGS: These are pre-set from the factory and require
little or no adjustment
: 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 01/05/09
ir/jxs
Click here for Units of Measure Conversion Calculators
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