Overview
The Spektrum SPM 3665-2170Kv Brushless Inrunner Motor is a high-performance brushless motor designed for dedicated RC enthusiasts who demand precision engineering and reliable power delivery. This 4-pole inrunner motor represents Spektrum's commitment to quality component manufacturing, offering hobbyists and serious modellers alike a dependable solution for their RC projects. Whether you're building a high-speed RC car, upgrading an existing setup, or exploring the world of brushless RC power for the first time, this inrunner motor delivers the efficiency and consistency that discerning RC users expect from a trusted manufacturer.
Inrunner motors like the 3665-2170Kv are engineered for applications that require sustained performance and smooth power delivery. The 2170Kv rating means this motor spins at 2170 revolutions per minute for every volt of input power, making it suitable for speed-focused builds that prioritise acceleration and top-end velocity. The 4-pole design provides an efficient balance between torque characteristics and rotational speed, ensuring your RC model responds predictably across the entire throttle range. With Spektrum's reputation for quality RC electronics built over decades of innovation, you can trust this brushless motor to perform reliably whether you're racing competitively or enjoying casual weekend bashing.
Brushless motors like this inrunner offer significant advantages over traditional brushed alternatives. They're more efficient, produce less heat during extended use, require minimal maintenance, and deliver smoother, more consistent power delivery. For UK RC enthusiasts seeking a quality brushless motor upgrade or replacement, this Spektrum unit stands out as a genuine component from an authorised manufacturer, backed by proven reliability and precision manufacturing standards. The compact 3665 motor size makes it compatible with a wide range of RC vehicle platforms, from street cars to off-road bashers.
Key Features
- Brushless Inrunner Design — This motor uses brushless technology, which eliminates carbon brush wear and maintenance headaches whilst delivering superior efficiency and longevity compared to brushed motors, making it ideal for serious RC enthusiasts who want reliability and consistent performance.
- 2170Kv Rating — The 2170Kv specification means exceptional rotational speed, delivering high RPM output that translates to impressive velocity for your RC model, particularly suited to speed-focused applications where acceleration and top-end performance matter.
- 4-Pole Configuration — The 4-pole stator design provides an optimal balance of power delivery characteristics, ensuring smooth acceleration and predictable throttle response across all driving conditions and terrain types.
- 3665 Motor Size — The compact 3665 form factor offers excellent versatility, fitting into many RC vehicle chassis designs without requiring extensive modification or custom mounting solutions.
- Spektrum Quality Assurance — As a genuine Spektrum component, this motor benefits from rigorous quality control and engineering standards, ensuring consistent performance and reliability that you can depend on season after season.
Technical Performance
The Spektrum 3665-2170Kv Brushless Inrunner Motor represents precision engineering designed for high-speed RC applications. The inrunner configuration places the rotating windings inside a fixed permanent magnet stator, creating a compact, lightweight unit that maximises efficiency and minimises heat generation during extended use. With a 2170Kv rating, this motor delivers rapid acceleration and impressive top-end speed, making it well-suited for competitive racing or high-performance street bashers where velocity is paramount. The 4-pole design contributes to smooth power delivery and responsive throttle characteristics, allowing drivers to modulate their input with precision. The brushless architecture eliminates maintenance-intensive carbon brushes found in brushed motors, reducing friction losses and extending the operational lifespan of the unit. Built to Spektrum's recognised manufacturing standards, this motor combines durable construction materials with carefully engineered magnetics to deliver consistent performance across varying load conditions. Whether powering an RC car UK setup or integrating into a custom high-speed build, this inrunner motor provides the reliability and performance expected from a brushless RC motor in its class.
What's in the Box
- SPM 3665-2170Kv Brushless Inrunner Motor
What You Need to Complete
- Electronic Speed Controller (ESC) compatible with brushless motors
- LiPo battery pack (voltage and capacity dependent on your chosen ESC and vehicle platform)
- Radio receiver and transmitter system
- Mounting hardware appropriate to your RC vehicle chassis
- Propeller or pinion gear suitable for your application and kv rating
Frequently Asked Questions
- What voltage battery does the 3665-2170Kv brushless motor require? — This motor requires a brushless ESC and compatible LiPo battery pack. The specific voltage depends on your chosen ESC's specifications; common setups use 2S, 3S, or higher cell count batteries. Always consult your ESC manual and motor specifications to determine the correct battery configuration for your particular build.
- What is the difference between an inrunner and outrunner brushless motor? — Inrunner motors, like the 3665-2170Kv, have the windings rotating inside a fixed magnet housing, making them compact and lightweight whilst delivering high RPM suitable for speed applications. Outrunner motors work in reverse, with the magnets rotating around fixed windings, typically producing more torque but at lower speeds. For high-speed RC car builds, inrunners like this Spektrum unit excel at delivering the velocity and acceleration required.
- Can I use this motor as a brushless RC motor replacement in my existing vehicle? — Yes, provided your RC model has a brushless-compatible ESC and suitable battery pack. The 3665 motor size is widely compatible with many RC car platforms. You'll need to ensure your ESC is rated for the motor's specifications and that your battery voltage matches your ESC's input requirements. Always verify mechanical fit before installation.
- How does the 2170Kv rating affect my RC car's performance? — The 2170Kv rating indicates this motor spins at 2170 RPM per volt, making it a high-speed unit excellent for velocity-focused builds. Higher Kv ratings produce more top-end speed but generate less torque, making them ideal for lightweight, speed-oriented RC cars rather than heavy-duty crawlers or power-demanding applications.
- Is the Spektrum 3665-2170Kv suitable for beginners? — This is a component motor designed for builders with intermediate knowledge of RC systems. Beginners should consider whether they already have a compatible ESC, receiver system, and battery setup. If starting fresh, a ready-to-run RC car UK package might be more appropriate; however, if you're upgrading an existing brushless-compatible vehicle, this motor is straightforward to install.
- What maintenance does a brushless motor require? — One of the main advantages of brushless motors is minimal maintenance. Unlike brushed motors, there are no carbon brushes to wear out or replace. Simply keep the motor clean and dry, avoid water ingress unless specifically waterproofed, and occasionally check for loose connections. A well-maintained brushless motor like this Spektrum unit will provide years of reliable service.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the SPM 3665-2170Kv Brushless Inrunner Motor, 4-Pole P-SPMX-1045 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
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- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
