Reds Racing 521 GTS engine

Reds Racing have introduce their new generation of nitro GT engines called the 521 GTS. The new engine, available in steel or ceramic bearing versions, features high reliability, tuning stability and great fuel mileage, combined with specific technical changes in the porting and new materials. This 5 port engine claims to offer higher power and better fuel efficiency compared to other engines. The S line features a new and unique high stiffness crankcase design and uses all new materials and casting technology. The engine is produced with pressure die casting, which is a very high quality process, while previous generation R line crankcase was with gravity casting. Another big improvement is the brand new aluminium carburettor, again made using pressure die casting. The decision to change carburettor materials from plastic to aluminium further improves idle stability and tuning. The new carburettor is 30° inclined for better fluid dynamics to increase engine power and has an insulator to reduce carburettor temperature and increase idle stability at high temperatures.

The new carburettor retainer allows better blocking of the carburettor without damaging the plastic bush thus guaranteeing better reliability and less maintenance. Internally the 521 GTS Engine features new materials for piston, sleeve and crankcase in order to optimise thermal expansion and improve power. The idea was to develop a high power engine even more powerful than the M5GT engine with exceptional fuel mileage. Finally a new high torque 5 ports sleeve offers improved torque and power output.

Specifications
Category: 1/8 GT
Displacement [cm^3]: 3,5
Bore [mm]: 16,05
Stroke [mm] 167.3
Inlet ports: 5
Outlet ports: 1
Crankshaft: balanced
Backplate: aluminum
Front ball bearing: 7x19x6 rubber seal made in Japan
Rear ball bearing: 14×25,4×6 Swiss made ceramic os steel
Carburettor diameter [mm]: 7.0 stock  (7.5, 8.0, 8.5 and 9 optional)
Carburettor: VCX2-A aluminum (2 needles)
Weight [g]: 350
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

Source: Reds Racing [

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