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O.S.Speed R21GT Combo Set
  • Overview
  • Specs
  • Reviews
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Overview

We are proudly announcing O.S. SPEED R21GT for a relatively new category 1/8 GT class. The new engine aims at IFMAR world championship to be held in the United States in January, 2020. So the design of the engine is fully conformed to IFMAR regulation. The crankcase is modified version of R2101, cylinder/piston is new design: 5 scavenging ports + 3 exhaust port, the crankshaft is also newly designed: double counter weight made of Phosphor bronze for better torque, of course the crankshaft is DLC coated to minimize mechanical friction and with silicon filler for light weight. The carburetor is also new design, 22E(B)GT double adjustment type carburetor for smooth and better response from cornering with a 7.0mm restrictor, which conform to IFMAR regulation. The cooling head is designed to optimize heat dissipation and light weight.

Video Overview

 

Piston & Cylinder

Piston & Cylinder

5-scavenging port + 3 exhaust port design is conforming to IFMAR regulation

 

Crankshaft

Crankshaft

DLC coated, Silicon filler, double counter weights for powerful torque and response

 

 
Carburetor

Carburetor

New carburetor 22E(B)GT: Double adjust type, smooth acceleration from cornering

 
Bore: 0.633" (16.08mm)
Carb Type: Slide Valve w/7mm Restrictor Installed
Crankshaft Threads: UNF 1/4-28
Crankshaft Type: SG
Cylinder Type: Five Scavenging Ports, three Exhaust Ports
Cylinders: One
Displacement: 0.213 cu in (3.49cc)
Engine (Only) Weight: 13.2oz (369g)
HP: 2.65ps, 2.61hp @ 34,000RPM
Height: Bottom/Mounting Tabs to top of Cylinder Head 3.4" (86.5mm)
Length: Backplate to Front Bearing, 2.5" (64.6mm)
Muffler Type: Tuned Muffler
Oil Type & Content: 12-16% Synthetic Oil Mixture in Fuel
Plug Type: RP6 Turbo Type, Medium Heat Range
RPM Range: 4,000 - 42,000
Recommended Fuel: 10-30%, 20% Nitro Content for Break-In
Stroke: 0.677" (17.20mm)
Type: 1/8 scale On-Road GT Racing Engine
Width: At Mounting Tabs 1.8" (45mm),

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