In 1959 – by which time the Coventry Climax engines had been stretched to 2.5-litres – Chapman continued with front-engined F1 cars, but achieved little, so in 1960 Chapman switched to the milestone mid-engined Lotus 18.
Pada tahun 1959 - di saat mesin Coventry Climax Dibesarkan kembali menjadi 2.5-liter - Chapman Melanjutkan mobil F1 bermesin depan namun hanya mendapat sedikit hasil sehingga tahun 1960 Chapman menggantinya ke Lotus 18 bermesin tengah.