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From Wikipedia, the free encyclopedia

Lotus Mark IV was a trials car by Colin Chapman built on an Austin 7 chassis. Chapman’s success at building trials cars brought another previous customer, Mike Lawson, to order a second trials car in 1952 to replace his Lotus Mark II, in which he won the Wrotham Cup. Once again Chapman chose an Austin Seven as the starting point, reinforcing the frame and installing a four-cylinder 1,172 cc (71.5 cu in), Ford, sidevalve engine. Chapman used all the tricks he had learned in his previous cars, constructing a lightweight aluminum body with a rounded nosecone. He fitted a 3-speed transmission taken from a Ford 8 and the divided front axle as on his previous cars.

Lawson won his class in the very first attempt in this car, following up with others, solidifying Chapman’s reputation as a designer and engineer. The success of this car, and other requests for more cars, led Chapman and Michael Allen to establish Lotus Engineering in a disused stable in Hornsey.[1]

Ford Sidevalve Motor
Configuration: S4 SV
Displacement: 1172 cc
Bore/Stroke: 63.5mm x 92.456mm (2.5x3.64")


  1. ^ Setright, L.J.K, "Lotus: The golden mean", in Northey, Tom, ed. World of Automobiles (London: Orbis, 1974), Volume 11, p.1222.
  • Taylor, William, The Lotus Book:The Complete History of Lotus Cars Coterie Press Limited, 1998.
  • Tipler, John, Lotus and Caterham Seven: Racers for the Road The Crowood Press, 1995.
  • Coulter, Jeremy, The Lotus & Caterham Seven: A Collector's Guide Motor Racing Publications, 1986.
  • Setright, L.J.K, "Lotus: The golden mean", in Northey, Tom, ed. World of Automobiles (London: Orbis, 1974), Volume 11, p. 1221-34.

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This page was last edited on 19 June 2017, at 00:08
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