Lotus Mark IV

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 aluminium 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.

Lotus Mark IV
Overview
Manufacturer	Lotus Cars
Production	1952 (1 unit made)
Designer	Colin Chapman
Body and chassis
Class	Sports car
Body style	Roadster
Related	Austin 7
Powertrain
Engine	Ford side valve 1172cc
Chronology
Predecessor	Lotus Mark III
Successor	Lotus Mark V

Lawson won his class in the 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.

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

References

• 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.

External links

• Motorbase Accessed 17 February 2006.