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

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)

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