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O.S.Speed R21GT Engine

Item No. OSMG2095
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5 out of 5 Customer Rating

O.S.Speed R21GT Engine

Item No. OSMG2095
$559.99 Price reduced from $929.99 to
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Product Details

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

 

Product Specifications

Specs

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