Motor King 21K EVO/3

The King 21K EVO/3 Motor is NSR's choice for those who do not accept compromises on the track.

Reference NSR3023, this long can motor —pink head— has been a favourite among GT competitors for years precisely because it combines two qualities that rarely go together: a respectable top speed and torque that is noticeable from the first corner. It is not a motor for practice: it is for winning.

Main features

• Speed: 21,400 RPM at 12V
• Torque: 322 g/cm
• Format: Long Can
• Identification: pink head
• Generation: EVO/3, third evolution of the King 21K family

Behaviour and performance

The 21,400 RPM ensures competitive top speed on the long straights of any circuit. But where it really makes a difference is in corner exit: the torque of 322 g/cm allows for strong acceleration without the car losing rear grip, provided the transmission is well adjusted.

The EVO/3 generation introduces improvements in thermal stability compared to previous versions, resulting in more consistent performance during long endurance sessions. In long races or clubs where many heats are run back-to-back, this is a real advantage: the motor maintains its behaviour without degrading from accumulated heat.

The magnetic field generated by the motor also contributes to the aerodynamic loading effect, improving track adhesion and allowing for safer and faster cornering. This effect is especially valued on technical circuits with tight corners.

Recommended applications

This motor is designed for Long Can pods, the standard format in most NSR competition chassis aimed at GT. It is the usual choice for setups in GT3, GT Open and similar categories in both national clubs and international competitions under NSR regulations.

Its performance profile —high torque with moderate RPM compared to more radical motors— makes it particularly suitable for mixed circuits, where there are both fast straights and technical sections. If the layout rewards acceleration and braking more than pure top speed, the King 21K EVO/3 is hard to beat.

Usage recommendations

To get the most out of this motor, pay special attention to the gear ratio. A well-chosen pinion and crown gear will make the difference between a car that accelerates cleanly and one that slips or arrives loaded at the end of the straights. NSR offers a wide range of compatible pinions and crown gears for Long Can pods to adjust the ratio according to the circuit.

Regularly check the condition of the braids and the guide: a motor in perfect condition can lose up to 15-20% of its performance if the electrical contact is not optimal. Regular cleaning and maintenance are as important as the choice of motor.

Frequently asked questions

Is it compatible with any Long Can chassis on the market?

The NSR3023 is designed for Long Can pods and is compatible with NSR chassis that accept this format. To use it in pods from other brands, it is advisable to check the pod dimensions before installation, as tolerances may vary slightly.

What is the difference between the EVO/3 and previous versions of the King 21K?

The EVO/3 generation incorporates internal improvements aimed at thermal stability and performance consistency over prolonged sessions. The RPM and torque specifications are the same as in previous versions, but the behaviour remains more stable with intensive use.

Is it a suitable motor for a driver starting in competition?

The King 21K EVO/3 has a very manageable performance profile for a competition motor. Its generous torque facilitates cornering and does not require an extremely short transmission to be fast. It is a good choice for drivers making the leap to club competition without wanting to sacrifice development potential.

What gear ratio is recommended for use with it?

The optimal ratio depends on the circuit, but as a usual starting point, ratios between 3.5:1 and 4:1 are commonly used. On very technical circuits with few long straights, it may be beneficial to slightly shorten the transmission to better utilise the torque.

Does it need a break-in period?

Like all brushed motors, the King 21K EVO/3 improves its performance after a brief initial break-in. A gentle break-in at reduced voltage for a few minutes helps to settle the braids and optimises contact from the first heats.

The NSR Motor King 21K EVO/3 (ref. NSR3023) is a long can slot car motor delivering 21,400 RPM at 12V and 322 g/cm of torque, making it one of the most competitive choices for GT slot racing. With its EVO/3 generation improvements in thermal stability, this pink head motor performs consistently in endurance races and club championships. Compatible with Long Can motor pods, it is a benchmark in NSR GT car builds and high-performance slot racing setups worldwide.