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FAQs for RC Motors
KV is RPM per volt with no load. A 3300KV motor on 2S (7.4V) spins at roughly 24,400 RPM unloaded. Higher KV = more top speed, less torque. Lower KV = more torque, better for crawlers and heavy vehicles.
Motor size is given as a diameter (540, 3650, 4274 etc). Match it to your car's motor mount. For 1/10 cars, 540-size (3650) is standard. For 1/8, go 4274 or 4268. Check your car's manual for the recommended can size.