DB4

The Swift DB4 features naturally-aspirated 1.6-liter Toyota 4A-GE inline-four engine producing 240 horsepower (179 kW) utilizing DOHC 16-valve configuration with individual throttle bodies and electronic fuel injection through five-speed manual transmission and rear-wheel-drive achieving approximately 600-kilogram dry weight delivering exceptional power-to-weight ratio for Formula Atlantic competition. The open-wheel prototype incorporates carbon fiber monocoque chassis construction, pushrod-actuated suspension with adjustable geometry, ventilated disc brakes, and ground-effect aerodynamics optimized for high-speed circuit performance with minimal drag coefficient.

DB4 launched 1987 represents Swift Engineering dominant Formula Atlantic chassis designed by American constructor based Rancho Dominguez California winning championship five consecutive years 1988-1992 rendering previous-generation Ralt RT4 obsolete through superior aerodynamic efficiency and mechanical grip characteristics featuring refined handling balance and predictable limit behavior making this the benchmark single-seater for North American junior formula competition providing crucial development pathway for professional racing drivers advancing toward IndyCar and other premier open-wheel series.