page_title: Lotus-Ford Twin Cam
section_title: Special Equipment tune
hierarchical_section_title: Lotus-Ford Twin Cam / Technical / Special Equipment tune
caption_attribution_description: Impressionen der vierten "Classic Motor Days, Oldtimer und historische Fahrzeuge" auf dem Flugplatz Hungriger Wolf
context_page_description: The Lotus-Ford Twin Cam is an inline-four petrol engine developed by Lotus for the 1962 Lotus Elan. A few early examples displaced 1.5 litres, but the majority were 1.55-litre engines. It used a Ford 116E iron cylinder block and a new aluminium cylinder head with dual overhead camshafts. The Twin Cam was used in a variety of vehicles until Lotus stopped production in 1973. It was succeeded by the Lotus 907 engine.
context_section_description: Lotus began to offer more highly tuned Special Equipment engines as options in their cars. The parts for these engines could also be bought from Lotus Components Ltd. At first, these were Cosworth developed and assembled engines with cast cranks and Cosworth name plates on the cam cover. Duckworth was responsible for the design of the Special Equipment cams. Cosworth later distanced themselves from this business, and Lotus started selling 'BRM' equivalents. BRM Phase I consisted of BRM camshafts and high compression cast pistons, and BRM Phase II added Mahle forged pistons, BRM forged conrods, small-end bushes and big-end bolts to the Phase I. When offered in assembled form, these engines carried a BRM name plate on a specially cast 'BRM' cam cover, but the actual assembly of these high performance 'BRM' road engines was carried out by Rubery Owen & Co. Ltd., an affiliated company of BRM through its ownership, not by BRM itself. The Special Equipment ('S/E') engines had camshafts developed by Cosworth (CPL1 - Cosworth Production Lotus) with 22/62/62/22 timing and 0.349" lift, called 'L1' cams.
  Originally applied to tuned Elans and Lotus Cortinas, the term "Special Equipment" was later used by Lotus to designate those Series 2 and later Elans with higher output motors, and are referred to as Elan S/Es.
caption: BRM cam covers
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