O.S. Speed R2104 .21 9-Port On-Road Nitro Engine (Turbo) [OSMG2025]

Description

This is the O.S. Turbo Speed R2104 .21 9-Port On-Road Nitro Engine, a factory tuned engine solely developed for 1/8 racing competition. This redesigned engine boasts 9-port piston liner to improve torque in low-middle power range. It also produces enough power as designed even for high traction tracks. The redesigned crankshaft counter weight enables smooth power transition from low to top. Distance of each fin of the heat sink head is enhanced for better air flow for cooling and better balance. The heat sink head is anodized in both black and red for a high contrast and powerful aesthetic.
Features:
Cylinder Liner:
This engine boasts a 9-port piston liner to improve torque in low-middle power range. It produces enough power as designed even for high traction tracks.
Outer Head:
Distance between the cooling fins is enhanced for better air flow and better balance. The heat sink head is anodized in two colors: black and red.
Inner Head:
A silicon O-ring fit to the inner head prevents dust from coming into the engine.
Crankshaft:
The redesigned crankshaft counter weight enables smooth power transition from low to top.
Carburetor:
The carburetor is 21M2(B), which has been proved to be consistent and reliable for generations (R2101, 2102, 2103)
Specifications:
Bore:
16.08mm (0.633" )
Carb Type:
Slide valve
Crankshaft Threads:
UNF 1/4-28
Crankshaft Type:
Threaded
Cylinder Type:
Nine port liner
Cylinders:
Single
Displacement:
3.49 cc (0.213 cu in)
Engine (Only) Weight:
340g (11.99oz)
HP:
2.8 ps / 2.76 hp at 35,000 RPM
Height:
91.2mm (3.6"), total height
Length:
94mm (3.7") backplate to of crankshaft
Plug Type:
OS RP7 turbo, cold heat range
RPM Range:
4,000 - 45,000
Recommended Fuel:
10 - 30% nitro content, 20% recommended for break-in
Starter Type:
Bump
Stroke:
17.20mm (0.677" )
Type:
1/8 scale buggy engine
Width:
45mm (1.8") at mounting tabs
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