Further contributing to the weight advantage was the adoption of lightweight sequential manual transmission originally developed for Lotus 12 by Richard Ansdale and Harry Mundy incorporating the unique sequential-shifting gearbox and a ZF limited slip differential in a common Magnesium alloy housing to form a transaxle, which also provided the mounting points for inboard rear brakes.
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He then won at the fearsome Nürburgring in changeable weather, while Innes Ireland took a third win in the USA to help Lotus finish second in the constructors' championship in 1961.
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With Duckworth having left to form Cosworth in 1958, Mike Costin, who, despite being the co-founder of Cosworth, remained with Lotus for a while longer, adopted the improved Queer Box in Lotus 16 into a configuration for directly mounting it behind the engine for Lotus 18 with dedicated oil scavenge and pressure feed pumps, further improving its reliability while retaining the small and light design.
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