From REDS Racing:
Reds Racing is enthusiastic to introduce an necessary evolution inside its high-end off-road nitro engine lineup.
As a part of this growth, Reds Racing unveils a brand-new engine household referred to as the X Line, which can run alongside the present flagship 721 Superveloce Gen5 – S Line Model 2026.
The brand new X Line debuts with the 321 ESTREMO™, a 3-port engine designed to supply a distinct driving character in comparison with the well-known 721 S Line platform.
The 721 S Line will proceed to be totally produced in Italy, sustaining the identical philosophy, engineering method, and efficiency traits which have outlined it through the years.
The brand new 321 engine is manufactured in Japan and has been totally developed in accordance with Reds Racing design, engineering, and testing specs. Ultimate meeting and tuning are carried out instantly by Mario Rossi and Marco Rossi, guaranteeing the efficiency requirements and precision anticipated from Reds Racing engines.
A Collaboration Between Two Icons of RC Engine Expertise
The event of the brand new 321 ESTREMO™ represents an necessary collaboration between REDS Racing and probably the most revered corporations within the RC engine trade, O.S. Engines.
REDS Racing was based by Mario Rossi, probably the most influential figures in RC engine historical past and co-founder of the legendary Novarossi model since 1984. His many years of expertise in high-performance racing engine design have helped form a few of the most profitable engines ever produced.
By combining REDS Racing’s Italian racing engineering and growth philosophy with the manufacturing experience and precision of Japanese engineering, this mission brings collectively the perfect of two worlds.
The results of this collaboration is a brand new engine platform designed to ship excellent efficiency, reliability, and drivability—an engine that represents the proper mix of Italian racing ardour and Japanese manufacturing excellence.
Superior 3-Port Engine Design
From a technical standpoint, the 321 contains a 3-port configuration designed to ship elevated torque, leading to a driving really feel that differs considerably from the present 721 platform.
The cylinder and sleeve design has been developed ranging from the traditional Japanese 3-port structure, well-known for its simplicity, reliability, and powerful torque traits. Reds Racing engineers additional refined this idea by introducing further inside movement channels designed to information and optimize the air-fuel combination motion contained in the cylinder.
These channels enhance cylinder filling effectivity, enhancing the combustion course of and rising general efficiency.
The cylinder is paired with an ultra-lightweight piston, particularly designed to scale back reciprocating mass. By minimizing the transferring lots contained in the engine, Reds Racing engineers had been in a position to additional enhance engine responsiveness and maximize general energy output.
The result’s a design that maintains the simplicity and drivability of a standard 3-port engine, whereas incorporating superior particulars that enhance inside fluid dynamics and general engine effectivity.
Optimized Combustion Chambers
REDS Racing engineers additionally devoted intensive growth work to the combustion chamber design to ensure constant efficiency with completely different racing fuels.
Two devoted combustion chamber configurations have been developed, permitting the engine to carry out optimally with each 25–30% nitro gas and 16% nitro gas.
Every combustion chamber has been particularly designed to completely match the traits of its respective gas mix, guaranteeing the perfect steadiness of efficiency, reliability, and gas effectivity below a variety of racing situations.
AirBoost™ Backplate
One other key innovation featured on the brand new 321 engine is the REDS Racing AirBoost™ backplate, a real focus of know-how designed to additional improve engine efficiency and effectivity.
The AirBoost™ backplate has been engineered to extend mid-to-high RPM energy, enhance gas effectivity, and supply a quicker return to idle.
Its inside design options two devoted channels that direct the air-fuel combination towards the rear part of the switch ports, making a supercharging impact that improves cylinder filling and considerably enhances engine energy.
As well as, the AirBoost backplate is coated with a DLC (Diamond-Like Carbon) therapy, which reduces sliding friction between the connecting rod and the backplate. This superior coating improves engine effectivity, reduces put on, and contributes to decrease gas consumption.
Straightforward to Tune, Constructed to Win – 21J with Venturi XFlow™
To ensure extraordinarily simple tuning and constant efficiency on each observe, the 321 ESTREMO contains a carburetor primarily based on the legendary O.S. Velocity 21J, probably the most dependable and broadly used carburetors within the RC racing world.
REDS Racing engineers chosen the confirmed 21J platform and additional enhanced it with the Venturi XFlow™ system, designed to maximise airflow and enhance carburetion stability.
Because of its Extremely Quick design, the Venturi XFlow™ optimizes the air consumption path and permits the engine to breathe extra effectively. This leads to quicker throttle response, simpler carburetor tuning, and stronger general engine efficiency.
The Venturi XFlow™ is accessible in three sizes to adapt the engine to completely different observe situations and racing preferences:
- 6 mm – Most torque and improved gas effectivity
- 7 mm – Good steadiness between energy and drivability
- 8 mm – Most airflow and top-end efficiency
This method ensures steady carburetion and exact throttle response, giving drivers the arrogance wanted to push the engine to its limits in any racing situation.
REDS Extremely-Light-weight Cooling Head
The REDS ultra-lightweight cooling head has been engineered to maximise warmth dissipation whereas minimizing general engine weight.
Its optimized fin construction improves cooling effectivity and helps preserve steady engine temperatures even throughout demanding racing situations, guaranteeing constant efficiency throughout lengthy finals and intense competitors.
Excessive Sturdiness and Precision Engineering
The brand new engine integrates a number of superior sturdiness enhancements designed to maximise efficiency and reliability.
Each the crankshaft and the backplate characteristic DLC (Diamond-Like Carbon) coating, a know-how identified for its distinctive hardness and intensely low friction coefficient.
Because of this superior therapy, the crankshaft sturdiness can enhance by as much as 3 times in comparison with a traditional metal crankshaft, whereas additionally lowering inside engine friction.
The diminished friction between the connecting rod and backplate additionally helps prolong conrod life by roughly 50%, enhancing long-term reliability throughout demanding racing situations.
The crankshaft contains a double-balanced design, whereas its inside geometry has been revised to enhance each energy traits and engine smoothness.
The engine crankcase has been manufactured in accordance with the best high quality requirements, guaranteeing glorious rigidity, good part alignment, and most sturdiness.
Key Technical Options:
- 3-port engine design centered on excessive torque output
- Superior cylinder and sleeve design with optimized inside movement channels
- Extremely-lightweight piston to scale back reciprocating mass
- REDS ultra-lightweight high-efficiency cooling head
- AirBoost DLC-coated backplate for improved energy and effectivity
- DLC-coated crankshaft with double balancing
- Carburetor primarily based on O.S. Velocity 21J design
- Venturi XFlow™ consumption system out there in 6, 7, and eight mm sizesTwo
- devoted combustion chambers for 16% and 25–30% nitro fuels
Two Engines, Two Racing Philosophies
With the introduction of the 321 ESTREMO, Reds Racing now affords two distinct engine platforms designed to go well with completely different observe situations and driving kinds.
REDS 721 Superveloce
- 7-port engine structure
- Distinctive top-end pace
- Excellent gas effectivity
- Extraordinarily easy and linear energy supply
- Best for high-speed tracks and European-style layouts
REDS 321 ESTREMO
- 3-port engine structure
- Robust bottom-end torque and acceleration
- Glorious throttle response and drivability
- Designed for technical tracks with huge jumps
- Best for American-style layouts and demanding off-road situations
Collectively, the 721 Superveloce and the 321 ESTREMO give racers the likelihood to decide on the engine that greatest matches their observe situations, driving fashion, and racing technique.
With the introduction of the X Line, Reds Racing expands its presence within the off-road racing phase, providing drivers a brand new engine platform designed to ship a distinct efficiency philosophy alongside the established 721 S Line.
The 321 ESTREMO represents the proper fusion of Italian racing engineering and Japanese manufacturing precision, setting a brand new benchmark for efficiency, drivability, and reliability on the earth of off-road RC racing engines.
Technical Specs
Class: 1/8 Buggy and Truggy
Displacement: 3.5 cm³
Bore: 16.4 mm
Stroke: 16.4 mm
Inlet Ports: 3
Outlet Ports: 1
Entrance Bearing: 7×19×6 with single high-performance seal
Rear Bearing: 14×25.4×6 – 9 balls high-durability ceramic bearing
Carburetor Kind: VLX3-A aluminum lengthy needle
Venturi Diameter: 7.0 mm (optionally available venturi sizes: 6.0 mm and eight.0 mm – carburetor physique 9.0 mm)
Backplate: AirBoost DLC-coated backplate
Crankshaft: DLC-coated with two tungsten balancing weights
Weight: 345 g
Really helpful Equipment
To maximise the efficiency of your 321 Estremo™ engine, Reds Racing recommends pairing it with the next parts:
Glow Plug: REDS TS3 or TS4
Exhaust System: 2143 X-ONE X Line
Clutch System: REDS TETRA-X Clutch System
Gasoline: 16–30% nitro with 8–10% oil
Break-In Gasoline: 12% oil
Not suitable with S Line Exhausts, manifolds, gaskets, piston/sleeve/conrod set and spring set.
Out there variations:
#ENBU0042 321 ESTREMO 16% NITRO X Line
#ENBU0042B 321 ESTREMO 16% NITRO X Line Pre break-in service by Mario Rossi
#ENBU0044 321 ESTREMO 25-30% NITRO X Line
#ENBU0044B 321 ESTREMO 25-30% NITRO X Line Pre break-in service by Mario Rossi.
#COBU0036 COMBO 321 ESTREMO 16% NITRO with 2143 TORQUE XONE X Line
#COBU0036B COMBO 321 ESTREMO 16% NITRO X Line Pre break-in service by Mario Rossi
Go to Reds-Racing-USA.com
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