# Lotus Mark IV

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{{More footnotes|date=November 2021}}
{{Infobox automobile
| image = 1959 Lotus Seven Series 1, front right.jpg
| caption = 1959 Lotus Seven Series 1
| manufacturer = [Lotus Cars](/source/Lotus_Cars)
| production = 1952 (1 unit made)
| designer = [Colin Chapman](/source/Colin_Chapman)
| class = [Sports car](/source/Sports_car)
| body_style = [Roadster](/source/Roadster_(automobile))
| related = [Austin 7](/source/Austin_7)
| engine = Ford side valve 1172cc
| predecessor = [Lotus Mark III](/source/Lotus_Mark_III)
| successor = [Lotus Mark V](/source/Lotus_Mark_V)
}}

{{Use dmy dates|date=June 2017}}
{{Use British English|date=June 2017}}
'''Lotus Mark IV''' was a trials car by [Colin Chapman](/source/Colin_Chapman) built on an [Austin 7](/source/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](/source/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](/source/Cylinder_(engine)) {{convert|1172|cc|abbr=on}}, [Ford](/source/Ford_Motor_Company), [sidevalve](/source/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](/source/Ford_8) and the divided front axle as on his previous cars.  

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](/source/Hornsey).<ref>Setright, L.J.K, "Lotus: The golden mean", in Northey, Tom, ed. ''World of Automobiles'' (London: Orbis, 1974), Volume 11, p.1222.</ref>

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

== References  ==
<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.&nbsp;1221-34.

== External links ==
* [http://www.motorbase.com/vehicle/by-id/17305064/ Motorbase] Accessed 17 February 2006.
{{Lotus}}

Mark 04

{{Classicpow-auto-stub}}

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Adapted from the Wikipedia article [Lotus Mark IV](https://en.wikipedia.org/wiki/Lotus_Mark_IV) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Lotus_Mark_IV?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.