DACTwin-Three Air-Cooled Six

The sole defensible D.A.C. mechanical model, marketed as the Twin-Three or Detroit Air-Cooled Car, on a 115-inch (2,921 mm) wheelbase. Factory advertising and contemporary reporting establish one shared chassis with three body configurations rather than three independently engineered model lines: a five-passenger phaeton/touring, four-passenger coupe and five-passenger sedan. The May 1922 report gives a 30-degree V6 with 2 7/8-inch bore and 4-inch stroke, calculating to 155.9 cu in/2,554 cc, 31.2 HP at 2,600 rpm in Detroit laboratory testing, 1,740 lb (789 kg), 27 mpg at 25 mph and 24 mpg at 35 mph. Earlier advertising rounded output to 32 HP at 2,700 rpm and claimed 30 mpg; both states are preserved without converting promotional fuel economy into a guaranteed specification. A June account reports the engine alone at 191 lb (87 kg). Distinctive details included separately cast finned cylinders, fan and air chutes, pressure lubrication, electric starting, demountable straight-side cord-tire rims and a combined steering-wheel throttle/horn control. No verified top speed, fuel-tank volume, chassis-number range, body-by-body production split or surviving-car census has been found. D.A.C. here means Detroit Air-Cooled Car Company and excludes Henry Ford's earlier Detroit Automobile Company and the unrelated Romanian DAC truck marque.