It was an evolution of the previous Lotus 29 and Lotus 34 Indy designs, but this time with a full monocoque tub chassis; it was powered by the same four-cam Ford V8 fuel injected engine as used in the 34, giving out around 500 bhp.
It was partially based on the Lotus 38 Indycar, due to Chapman's experience at Indy with larger engine capacity and tyre/suspension setup.
Cooper did not return, but from 1963 on British built mid-engined cars from constructors like Brabham, Lotus and Lola competed regularly and in 1965 Lotus won Indy with their Type 38.
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