Behind the Scenes: Larson Marks Racing Shop Tour
Simply put, sprint cars are built for speed – high power, with low weight. The car has no dead weight. Every part on the car in some way contributes to the car’s performance – or it is left off.
Sprint cars have no transmissions, no starter motor, and the battery is only large enough to power the ignition system for the evening. They are either in or out of gear. A T-handle on the end of a cable runs down to the rear end, and if you pull the cable, the gears disconnect.
Suspension on a sprint car is down and dirty. Referred to as 4-bar torsion, it consists of a live axle in the rear and a dead axle up front, and torsion bars for springs on each corner of the car.
Universal joints at both ends of the torque tube that runs between the hot-running V8 engine and the rear end let the driveshaft turn when the rear axle moves up and down. The driver straddles the driveshaft, over the rear axle.
The chassis, made of chrome-moly steel, consists of tubes that run from the top of the roll cage down to the front of the car.
Two huge rear tires of different sizes struggle for traction on the clay beneath as the driver wrestles with the steering wheel broadsliding around corners. Watch the video below to see the complete tour of the shop.
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