The 1927 American auto racing season was highlighted by the AAA Championship Car series, which featured 11 championship rounds held on dirt tracks, wooden board ovals, and paved circuits from March through October. The season culminated at the prestigious Indianapolis 500 on May 30, where George Souders drove a Duesenberg Special to victory at an average speed of approximately 97.5 mph. Consistent performances across the season earned Peter DePaolo the AAA National Championship, reflecting the skill and endurance required to master the varied tracks and high-powered cars of the era. The season demonstrated the rapid technological development of American open-wheel racing and helped solidify the Indy 500 as the centerpiece of the national championship.
In Europe, the 1927 season was dominated by Grand Prix and endurance racing, with the AIACR World Manufacturers’ Championship running under the 1.5-liter supercharged formula. French teams, particularly Delage, were the dominant force, with Robert Benoist securing multiple victories, including a key triumph at the British Grand Prix at Brooklands, helping France claim the World Championship title. Endurance racing also grew in prominence, with the 24 Hours of Le Mans in June won by Dudley Benjafield and Sammy Davis in a Bentley, who overcame nighttime incidents to take the overall victory. Italy hosted the inaugural Mille Miglia, a grueling 1,600-kilometer road race from Brescia to Rome and back, won by Nando Minoja and Giuseppe Morandi in an O.M. Superba. The European season emphasized both speed and reliability, with drivers and manufacturers pushing technological innovation while laying the groundwork for the modern Grand Prix era.
