GoolRC 3674 4Poles 2250KV Brushless Motor for RC 1/8 Truck Car Boat 3674 4Poles 2250KV Brushless Motor for RC 1/8 Truck Car Boat. 4Poles design, high torque & high efficiency. The overall efficiency exceed 90 percent. Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance. High quality materials adopted: high intense aluminum alloy anodizing shell , front & back cover. High-performance temperature-resistant magnetic steel and imported high-speed bearing.