The Vauxhall 20 h.p. chassis code A, was a four-cylinder medium-sized car manufactured by Vauxhall from 1908 to 1914 with one more built in 1920. It was the first production Vauxhall designed by Laurence Pomeroy. It became a highly acclaimed 3 litre of its day and at Brooklands on 26 October 1910 it became the first 20 hp car to exceed.
Genesis
Laurence Pomeroy had joined Vauxhall in 1907 as an assistant draughtsman at the age of twenty-two. He first made his mark at the 1908 RAC and Scottish Reliability Trial, held in June of that year. His first prototype, a development of Vauxhall's 12-16 and named Y1, had outstanding success showing excellent hill climbing ability with an aggregate of 37 seconds less time in the hill climbs than any other car in its class and unparalleled speeds around the Brooklands circuit. His Vauxhall was so far ahead of all cars whatever class that the driver could relax, accomplishing the at an average speed of, when the car was capable of. It went on to win class E of the Trial. That design was put into production in 1908 as Vauxhall's 20 hp offering. Four distinct variations were produced between 27 October 1908 and the end of production in 1914. One last car was put together in 1920.
The Four Distinct versions - A09, A11, A12 and 16-20
The A09 and A11 were supplied with a four-speed gearbox though some of the earliest cars retained the three-speed gearboxes of the 12-16 and at least 70 of the first cars also retained the sheet copper sump of their predecessor. There was a major revision of the chassis for the A12 and for the 16-20 both engine and chassis underwent major redesign.
Range for 1913
In November 1912 immediately before the opening of the Olympia Show Vauxhall announced their full range for 1913 would be four chassis:
all were to have 4-speed gearboxes See the table below for more information. Capable of up to the A-Type Vauxhall was one of the most acclaimed 3-litre cars of its day, achieving many records for out-right speed and high speedendurance, within the 21 hp limit, as well as having had some parental involvement in the conception of both the Prince Henry and the 30-98 Vauxhalls. Less than two dozen survive today out of the 950 produced.
