Motor SC-29 Sprinter- 2

The SC-29 Sprinter-2 Junior: active power and intelligent cooling in a single motor

Scaleauto has been developing motors designed for demanding users for years, and the SC-29 Sprinter-2 Junior (reference SC-0029) is a clear example of that philosophy. With 22,500 rpm and the exclusive Active Cooling System, this motor is designed to keep the temperature under control even during long racing sessions, preserving performance and extending the lifespan of the unit.

Main features

• Speed: 22,500 nominal rpm.
• Cooling system: Active Cooling System (ACS), Scaleauto's proprietary solution to reduce heat generated during continuous operation.
• Format: Long Can, greater armature length providing more sustained torque throughout the rpm range.
• Torque: 12 gr. in MPM measurement; 7 gr. in UMS category.
• Rotor weight: 0.29 gr.
• Counterweight: 430 gr.

Recommended applications

The SC-29 Sprinter-2 Junior is particularly suitable for Junior categories and regulations that limit torque measured in UMS. Its balance between power and control also makes it interesting for Sport track layouts (Scaleauto, Slot.it) where fluidity and consistency from lap to lap are sought, not just top speed.

Thanks to the Long Can format, this motor adapts to chassis that allow inline configurations —longitudinal motor, in line with the rear axle— favouring a lower centre of gravity and a more uniform mass distribution.

Behaviour and performance

Scaleauto's Active Cooling System is not just a simple catalogue detail: in real competition, the motor temperature directly affects the consistency of the rpm and, therefore, the lap times. A motor that operates at a lower temperature maintains its electrical characteristics more stably throughout the session, resulting in less variability between laps and greater reliability in the final stages of a heat.

With 22,500 rpm and a torque of 12 gr. (MPM), the SC-29 offers a responsive feel without being wild on corner exits, something particularly valued by drivers who prioritise consistency over the risk of derailment.

Usage recommendations

• Check the compatibility of the receiving chassis with the Long Can format before mounting.
• Inspect the condition of the car's braids before each session: good electrical contact is essential to take advantage of this motor's rpm range.
• Adjust the gear ratio (pinion/crown gear) according to the layout: circuits with many slow corners benefit from shorter ratios; fast layouts allow for longer ratios.
• In UMS categories, respect the certified torque value: 7 gr.

Frequently asked questions

What does "Active Cooling System" mean in the SC-29?

It is Scaleauto's proprietary active cooling system integrated into the motor. It allows for more efficient heat dissipation during operation than a conventional motor, maintaining stable performance during long sessions.

What is the difference between MPM torque (12 gr.) and UMS torque (7 gr.)?

MPM and UMS are two methods of measuring motor torque used by different slot racing organisations and clubs. The same motor can yield different values depending on the measurement system used. In UMS regulations, the SC-29 Sprinter-2 Junior offers 7 gr. of torque.

Is it compatible with universal track systems (Scalextric, Ninco)?

The motor's compatibility depends on the car's chassis, not the track. The SC-29 can be mounted in cars prepared to run on any type of track, as long as the chassis accommodates the Long Can format and the chosen motor configuration.

What motor configuration is it designed for: inline, sidewinder or anglewinder?

The Long Can format and dimensions of the SC-29 make it particularly suitable for inline configurations (longitudinal motor, perpendicular to the rear axle), although specific compatibility depends on the chassis in which it is mounted.

Does it require a break-in period before use in competition?

Like any brushed motor, the SC-29 benefits from a smooth break-in period —at reduced voltage and with direction changes— to settle the brush of the commutator and optimise contact. Scaleauto does not specify an official protocol, but it is a common and recommended practice in competitive slot racing.

The Scaleauto SC-29 Sprinter-2 Junior (SC-0029) is a high-performance slot car motor featuring 22,500 rpm, Active Cooling System, Long Can format, and a torque rating of 12 gr. (MPM) / 7 gr. (UMS). Designed for junior competition categories and inline motor configurations, it delivers consistent lap times and reliable thermal management during extended racing sessions. Available at Ministry of Hobby, your specialist in slot car racing, scale models, and competitive motorsport hobby.