OS Speed B2102 Level 21 3P Low Gravity Off-Road Nitro Engine
This is the O.S. Speed B2102 .21 Off-Road Nitro Engine. The innovative B2102 engine comes equipped with a low profile head which provides great influence to the running performance. The low-profile cooling head (-17mm) makes the vehicles center-of-gravity much lower, which improves car handling drastically without sacrificing cooling performance.
The B2102 also comes equipped with the O.S. 22C (B) carburetor for improved fuel mileage to go the distance; ten-minute runs on a single tank are no longer a privilege of top drivers with magic fingers.
FEATURES
Low cylinder head reduces the buggys center of gravity by 0.67 (17mm) for better stability during aggressive driving
Newly designed 22C slide valve carburetor for better fuel economy
Tungsten weighted crankshaft with diamond-like coating and silicon potting
Bypass of crankcase is modified for better performance
Tuned pipe is constructed of aluminum with polished natural finish and has an EFRA-2089 noise rating
INCLUDES
O.S. Engines Speed B2102 Engine with P3 Turbo Glow Plug
T2090SC Tuned Pipe
6.5mm Carburetor Reducer in Red
Exhaust Seal Ring
One each 3mm, 16mm and 18mm Dust Caps
Instruction Manual
REQUIREMENTS
Fuel: 10-30 nitro content, 20 recommended for break-in
Air filter, glow starter and track equipment
SPECIFICATIONS
Engine
Displacement: 0.211 cu (3.46 cc)
Bore: 0.646 in (16.40 mm)
Stroke: 0.646 in (16.40 mm)
Practical RPM: 4,000-42,000
Power Output: 2.65 PS2.61 hp 34,000 rpm
Weight: 12.25 oz (347 g)
Crankshaft Size: UNF14-28
Distance Mounting Hole Centers Same Side: 0.83 (21mm)
Distance Mounting Hole Centers Opposite Side: 1.45 (37mm)
Width of Crankcase below Mounting Tabs: 1.2 (31.6mm)
Width of Mounting Tabs: 1.8 (45mm)
Height Mounting Tab to top of Cylinder Head: 2.6 (65.9mm)
Height Mounting Tab to center of Exhaust Outlet: 1.1 (28mm)
Height Crankcase Bottom to top of Cylinder Head: 3.2 (81.5mm)
Length of Crankshaft end to Front Bearing: 1.2 (29.5mm)
Length of Crankshaft end to Backplate: 3.7 (94mm)
Length of Crankshaft end to Center of Crankcase: 2.9 (73.5mm)
Carburetor Settings
(Carburetor is preset from factory and should only require very
small adjustments)
Needle Valve: 3 turns open from fully closed
Mixture Control Valve: One turn screwed in from flush position with carb body
Metering Needle: 0.3-0.4mm protruding from flush position with carb body
Throttle Stop Screw: Approximately 0.5mm from carb body when viewed from above
T2090SC Tuned Pipe
Length: 6.6 (167mm)
Diameter: 1.4 (35.2mm)
Exhaust Outlet Diameter: 0.31 (8mm)
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