The car that came to be known as the Lotus Mark II was created in 1949, while Colin Chapman was serving with the RAF. For his second car Chapman built on the knowledge gained from building and competing in the Lotus Mark I, so he again used the widely available and inexpensive Austin 7 chassis as a starting point. He boxed in the chassis rails and replaced the cross members with stronger tubular braces. He swapped the Austin engine for a Ford engine and transmission, first from a Ford 8, then from a Ford 10, but retained the Austin 7 rear axle. To be able to use a wider tyre, Chapman adapted Ford pressed-steel wheels. He modified the engine as far as the club rules would allow.
Anthony Colin Bruce Chapman, was an influential English design engineer, inventor, and builder in the automotive industry, and founder of Lotus Cars.
The Lotus Mark I was the first car designed and built by Colin Chapman in 1948, while Chapman was still a student at the University of London. The car was designed to compete as a trials car, and was constructed on an Austin 7 chassis and running gear and given registration number OX 9292. Chapman built the body utilizing a composite made of thin aluminum bonded to plywood. He modified the rear suspension to give better handling and the engine to give more power. His approach to automobile construction using sound engineering principles and ingenious chassis design set the stage for many more revolutionary designs to follow. Although the original Mark I has been lost to history after being bought by a mysterious buyer in 1950, a replica was created to the same dimensions that uses an identical Austin chassis and running gear. Chapman and his future wife competed with the car in English Trials, a form of competition over rough terrain against time. Chapman continued to develop and modify the Mark I. First larger wheels and tyres were fitted and the front beam axle was split and hinged in the centre to provide independent front suspension. The success of the car helped encourage Chapman to continue designing competition cars.
The Austin 7 is an economy car that was produced from 1922 until 1939 in the United Kingdom by Austin. It was nicknamed the "Baby Austin" and was at that time one of the most popular cars produced for the British market and sold well abroad. Its effect on the British market was similar to that of the Model T Ford in the US, replacing most other British economy cars and cyclecars of the early 1920s. It was also licensed and copied by companies all over the world. The very first BMW car, the BMW Dixi, was a licensed Austin 7, as were the original American Austins. In France they were made and sold as Rosengarts. In Japan, Nissan also used the 7 design as the basis for their first cars, although not under licence. This eventually led to a 1952 agreement for Nissan to build and sell Austins in Japan under the Austin name.
Chapman used this chassis and running gear to support a cigar-shaped body with a rounded nose. It has rudimentary cycle-type mudguards. The result was a very competitive trials car, but one also suitable for circuit racing. Chapman used the car to compete in events sponsored by the 750 Motor Club. Although Chapman built the car to compete in English Trials events, he also entered the car in track events, such as Silverstone, where he won in his class. From that point forward, Chapman concentrated on designing and constructing cars for race circuits instead of trials.
750 Motor Club is a motor racing club in the UK. It was founded in 1939 to promote the sporting use of the Austin 7.. It later led to racing and the 750 Formula where specials are raced. Famous members include Colin Chapman, Eric Broadley, Adrian Reynard, Arthur Mallock, Derek Bennett, Tony Southgate, Brian Hart, Gordon Murray, Jem Marsh, Frank Costin and Mike Pilbeam.
Silverstone Circuit is a motor racing circuit in England located next to the Northamptonshire villages of Silverstone and Whittlebury. The circuit straddles the Northamptonshire and Buckinghamshire border, with the current main circuit entry on the Buckinghamshire side. The Northamptonshire towns of Towcester and Brackley and Buckinghamshire town of Buckingham are close by, and the nearest large towns are Northampton and Milton Keynes.
Ford Sidevalve Motor:
- Config: S4 SV
- Displacement: 1172 cc
- Bore/Stroke: 63.5 mm (2.5 in) x 92.456 mm (3.6 in)
