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Radio Control > Engines > Car & Truck Engines > 16 and Over
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Product details

E2101 Force .21 4 Port
Item ID: OFN52210 | Retail Price: $155.95
Phil's Hobby Shop price: $124.79
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Product description

Ask us a question about E2101 Force .21 4 Port

             This is a .21 FORCE 4-PORT OFNA engine.
This engine is used to power 1/8th scale R/C kits.
*NOTE* Some kits require extra items to install and operate
this engine. Check kit requirements for these parts.


  • Oversized flow-through Blue anodized cylinder head
  • ABC construction (Aluminum piston with a chromed brass cylinder)
  • Rear exhaust
  • Ball Bearing-supported crankshaft
  • Slide Valve rotatable Carburetor
  • Needle valve adjusted by a screwdriver


  • (1) .21 OFNA Force engine w/Slide Valve Carburetor
  • (1) Flywheel (8.3mm ID x 24.6mm OD x 7.4mm Thick)
  • (2) Brass collets (these hold flywheel in place)
  • (1) Black silicone O-ring (15mm ID x 19mm OD x 11mm Thick)
  • (1) Running and parts information sheets


  • Displacement: 3.48cc (.21 cubic inches)
Bore: 16.6mm (.654")     Stroke: 16mm (.63")
Weight: N/A
Power Output: 1.7 BHP at 30,000 RPM
Practical RPM Range: 2,500-35,000 RPM
Crankshaft Thread Size: 1/4-28
Length: 63mm (2.58") from front of front bearing to back of backplate
Width: 29.6mm (1.17") the width neglecting the mounting flanges
37mm (1.46") distance across crankcase measured between the centers
Height: 100mm (5.50")


  • -Fuel with 5%-30% Nitromethane (15% is recommended) and a lubricant content of 18% or more
  • -Muffler (or tuned pipe with header).
  • -Glow plug (OSMG2690).


  • Also available with a pull start (OFNG5211), check kit for fit.
  • Mounting dimensions are different than the O.S.RX,RG series engines.
  • Weight in box: 0.43 kg (0.94 lb)
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