Yes, a person who is 5'7" (170 cm) can absolutely start a sprint car. The primary requirement isn't height, but rather physical strength, proper technique, and, most importantly, authorization and safety training. Starting these powerful machines involves a specific, physically demanding procedure that is standardized for safety reasons, regardless of the driver's stature.
The process doesn't typically involve a simple key turn. Instead, it requires engaging with the safety kill switch and the ignition system. Before even approaching the car, you must be suited in a full fire-retardant race suit, helmet, gloves, and head and neck restraint (HANS device). The first step is always to ensure the car is in neutral and that crew members are clear.
The actual starting sequence often involves an external starter motor, sometimes called a "pony motor." The driver or a crew member must vigorously crank this motor to turn the engine over. This action requires significant upper body strength. Once the engine is turning, the driver inside the cockpit must manage the fuel injection system and ignition to get the engine to "fire." It's a coordinated effort that emphasizes safety protocols over physical dimensions. The real barrier to entry is not height, but gaining the necessary experience and certification from a sanctioned racing school to even be allowed near the ignition switch of a competition vehicle.
