Riley 2.5 Supercharged “Blue Streak” 1938 In 1938 Riley introduced the 2.5 Litre, 4 cylinder engine known as the Big 4, 16/4 and Blue Streak. This amazing Riely was commissioned by an enthusiast who wanted “ A Riley fit for any occasion “ Starting with a 1938 Coventry built 2.5 Litre Adelphi chassis, Beaufort restoration began the long process of transforming the car into this ultimate Riley. Built over 36 months and said to have cost over £200,000 at the time, This Riley has ...