Surpass Hobby 3674 2250KV Brushless Inrunner Motor – 5 mm Shaft, Black & Red

Surpass Hobby SP‑036740‑02 S23L05 3674 2250KV Brushless Inrunner Motor – 5 mm Shaft, Black & Red

The Surpass Hobby SP‑036740‑02 S23L05 is a high‑performance 3674‑size 2250KV inrunner built for demanding RC applications on the ground and in the air. Its 4‑pole rotor, black‑and‑red aluminium housing, and hardened 5 mm shaft deliver strong torque, smooth power, and excellent efficiency. With a maximum current rating of 80 A, maximum voltage of 22.2 V (6S LiPo), and power capability up to 1800 W, this motor is engineered for serious performance in both 1/8 RC cars and large 90 mm EDF jets.

The motor comes pre‑fitted with 4 mm gold bullet connectors, ensuring compatibility with most high‑current ESCs used in both car and EDF setups.

Performance in RC Cars

The 2250KV rating gives a balanced blend of torque and RPM, making it ideal for 4S LiPo car builds. The 80 A current capability and 1800 W power ceiling allow aggressive gearing and strong acceleration in:

• 1/8 buggies
• 1/8 truggies
• 1/8 monster trucks
• 1/8 GT and rally cars
• Speed‑run builds needing stable temperatures and high torque

The smooth inrunner can design helps maintain consistent thermal performance during long runs or heavy off‑road use.

Performance in EDF Aircraft

The inrunner layout and electrical limits make this motor suitable for large EDF systems, especially those requiring torque and stable high‑RPM operation. It is well‑matched to:

• 90 mm EDF units (ideal)
• 100 mm EDF units depending on fan load
• Large twin‑EDF jets
• 6S EDF setups needing strong torque and efficient airflow

The 5 mm shaft fits most 90 mm EDF rotors, and the 22.2 V max voltage aligns with typical 6S EDF power systems. The 1800 W rating provides enough headroom for high‑demand EDF applications without thermal overload.

Key Features

• 3674‑size brushless inrunner
• 2250KV rating for balanced torque and RPM
• Maximum current: 80 A
• Maximum voltage: 22.2 V (6S LiPo)
• Maximum power: 1800 W
• Pre‑installed 4 mm gold bullet connectors
• 5 mm hardened steel shaft
• Black and red aluminium housing
• 4‑pole rotor for strong torque output
• Suitable for 1/8 RC cars and 90 mm EDF jets
• Ideal for 4S car setups and 6S EDF systems