Coming after the 6½ l brought out in 1926, Bentley thoroughly updated the project with a brawnier engine. This flagship model was incarnate by the finest British coachbuilders and as well sped with cracking success beside the 4½ l. It was Walter Owen Bentley’s loved model and got the firms most eminent automobile on the raceway.
Bentley attained more esteem subsequently testifying their survival at the twenty-four Hours of Le Mans and taking numerous English races comprising the Tourist Trophy and Brooklands Double 12. As a matter of fact, Bentley beat out the actual first Twenty Four Hours held in 1923, and became winner at the event in 1924, twenty-seven, twenty-eight, twenty-nine and thirty. These later triumphs were attained with particularly matched Speed Sixes which has been one of Walter Owen Bentley’s loved cars.
The fundament for all of Bentley’s automobiles constituted an engine which in many regards was in advance of its time. Drawing upon experience acquired from doing work at the Great Northern Railway and designing aeroplane engines, Walter Owen Bentley let in such features as aluminium pistons, dry-sump lubrication, twin spark ignition system and an innovative valve train in his engines. Early models boasted 4 piston chambers and afterward 1925, Bentley turned a straight 6 which would become his spotlight work, and allow for needed power for heavy weight coachwork and grand touring. Exapnding on the ½ Litre, the main raise for a Speed 6 comprised a square-section intake manifold that added to output from 147 to 160 bhp and eventually 180 bhp with a slight finetuning using an exclusive port.