REDS 721 Pista S Series .21 Competition On-Road Nitro Engine

The REDS 721 Pista S Series .21 Competition On-Road Nitro Engine features extreme power, high reliability and tuning stability. Combined with specific changes in the porting and materials, this 7 port engine features higher power and better fuel efficiency compared to any other engine. The engine comes with a DLC Coated crankshaft and backplate for improved engine durability. The crankshaft can last approximately 3 times longer than a standard crankshaft thanks to the extreme hardness of the diamond coating. Even the conrod life is lengthened about 50%. 

REDS recommends the 2113 pipe and M on-road manifold, with REDS original spare parts and accessories for the best performance. 

What is different?

To make it simple REDS Racing’s next generation engine will be produced with unique materials and technologies from different suppliers - all assembled in-house.

• Crankcase design: REDS Racing S line features a unique high stiffness crankcase design. It is all updated materials and casting technology. The engine is produced with pressure die casting, this is a very high quality process, as opposed to the M line crankcase that was manufactured with a gravity casting process.
• Carburetor and Venturi: Another big improvement is the updated aluminum carburetor made from pressure die casting. The carburetor materials have been changed 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. 
• Materials: S line 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 previous Reds Racing engines with exceptional fuel mileage. This goal has been achieved. 
• 7 Port Sleeve: A high torque 7 port sleeve was used for great torque and power output. Basically, the exhaust boost design combined with the inlet ports layout ensures an increase in power throughout the entire RPM range.

Specifications:

Category: 1/8 on-road

Displacement: 3.5cc

Bore: 16.04mm

Stroke: 17.32mm

Inlet ports: 7

Outlet ports: 3

Crankshaft: balanced with low friction DLC Coating 

Backplate: aluminum with low friction DLC Coating

Front ball bearing: 7x19x6 rubber seal made in Japan

Rear ball bearing: 14x25.4x6 Swiss made ceramic

Carburetor diameter: 9.0mm stock  (8.0 and 8.5 optional)

Carburetor: VCX3-A aluminum (3 needles)

Weight: 336g

Recommended Glow plug: REDS TS7

Recommended pipe: REDS 2113 + M

Recommended fuel: 16-25% nitro, 8% oil

Break-in fuel: 12% oil