In 1961, F1 adopted the new 1.5 L engine regulations, and Walker flirted with the idea of building his own chassis, but retained the Lotus 18 for the season.
En 1961, a F1 adoptou as novas regulacións do motor de 1.5 Litros, e Walker coqueteou coa idea de construír o seu propio chasis,, pero mantivo o Lotus 18 para a tempada.