 For 1966 , the engine capacity limit in Formula One was doubled from 1 @.@ 5 litres ( 92 cu in ) to 3 litres ( 183 cu in ) . It was not feasible to enlarge existing 1 @.@ 5 @-@ litre engines to take full advantage of the higher limit and Climax chose not to develop a new 3 @-@ litre motor , leaving many teams without a viable engine for 1966 . 
