REDS 521 GTS Ceramic 5-Port .21 Competition On-Road Nitro Engine

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REDS 521 GTS Ceramic 5-Port .21 Competition On-Road Nitro Engine
Price: $429.99
Discontinued Online
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
The REDS 521 GTS Ceramic 5-Port .21 Competition On-Road Nitro Engine features high reliability, tuning stability and great fuel mileage. Combined with specific technical changes in the porting and new materials, this 5 port engine features higher power and better fuel efficiency compared to any other engine in its class.

Manifolds and Pipes have been specifically developed for the S line. Reds recommends to use the engine with Reds Racing 2113 pipe and Short manifold, TS7 glow plug and Reds Racing GT Clutch system.

What is different?
To make it simple REDS Racing’s new generation engines are produced with different materials, from different suppliers and with new technologies. All assembled in-house. 
  • Crankcase design: REDS Racing S line features a unique high stiffness crankcase design. It features updated materials and casting technology. The engine is produced with pressure die casting, this is a very high quality process. Previous generation R line crankcase was with gravity casting.
  • Carburetor and venturi: Another big improvement is the aluminum carburetor made from pressure die casting. Reds decided to change carburetor materials from plastic to aluminum to further improve idle stability and tuning. On a technical note, the carburetor is 30° inclined for better fluid dynamics to increase engine power. Finally, the carburetor has an insulator to reduce carburetor temperature and increase idle stability at high temperatures. 
  • Clamping System: The carburetor retainer allows better blocking of the carburetor without damaging the plastic bushing thus guaranteeing better reliability and less maintenance.
  • Materials: 521 GTS Engine features updated materials for the piston, sleeve and crankcase in order to optimize thermal expansion and improve power. The idea was to develop a high power engine even more powerful than M5GT engine with exceptional fuel mileage. We have achieved it.
  • 5 Port Sleeve: High torque 5 port sleeve for improved torque and power output. 
Specifications:
Category: 1/8 GT
Displacement: 3.5cc
Bore: 16.05mm
Stroke: 167.3mm
Intake ports: 5
Exhaust ports: 1
Crankshaft: balanced
Backplate: aluminum 
Front ball bearing: 7x19x6 rubber seal made in Japan
Rear ball bearing: 14x25.4x6 Swiss made ceramic 
Carburetor diameter: 7.0 stock  (7.5, 8.0, 8.5 and 9 optional)
Carburetor: VCX2-A aluminum (2 needles)
Weight: 350g
Engine temperature: 110-130°C  (depending on air temperature)
Recommended Glow plug: REDS TS7
Recommended pipe: REDS 2113 + S
Recommended fuel: 16-25% nitro, 8-10% oil
Break-in fuel: 12% oil 

This product was added to our catalog on March 17, 2021

Ashlin Williams
Verified Owner
Wednesday, Nov 30 2022 (about a year ago)
REDS 521 GTS Ceramic 5-Port .21 Competition On-Road Nitro Engine
Great engine for the price. I haven't run it a lot, its still not even totally broken in. Has a lot of pinch.