Trevor Taylor and Cosworth co-founder Mike Costin tested the car extensively, the first problem being the positioning of the oil tank, which for weight distribution had been placed directly behind the driver's backside, causing considerable discomfort.
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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