car ended production in October 1953 a switch to no running boards was amongst many updates to the RME including wholly new shaped front mudguards. Produced from 1952, it was discontinued in 1955 and ultimately its place in the range went in 1957 to the much shorter and unrelated, intended but unused, replacement for the Morris Minor — Riley One-Point-Five also sold as Wolseley 1500, Morris Major and the Austin Lancer. An RME tested by The Motor magazine in 1952 had a top speed of and could accelerate from 0– in 29.5 seconds. A fuel consumption of was recorded. The test car cost £1,339 including taxes. Riley RMF The RMF replaced the RMB in 1952. It shared that car's 2.5 L "Big Four" engine as well as the mechanical updates from the RME. The RMH Riley Pathfinder, the last automobile to use the Riley "Big Four" engine, and thus considered to be the last "real" Riley by purists, took its place after 1953 and continued in production until 1957. The RMF 2½ Litre models have light blue bonnet and bootlid badges, differentiating them from the RME 1½ Litre models which have dark blue badges. Riley 2½-litre Big Four engine The Big Four engine is a four cylinder 2.5 litre engine rated at 16.07 h.p. under the British RAC formula. It was designed in a matter of months, under difficult financial conditions, and announced in the summer of 1937. It followed existing Riley practice, similar to their 1.5 litre engine, but with each cylinder completely surrounded by a water jacket. The fully counter-weighted and balanced crankshaft ran in three main bearings. Pre-war power output was initially , then raised to . In its final Riley Pathfinder form, it developed and was produced until the end of Riley Pathfinder production in February 1957. Bibliography A-Z of Cars 1945–1970. Michael Sedgwick and Mark Gillies. Bayview Books. 1989. Book by James Taylor - RILEY RM-SERIES - Book by John Price Williams - The Legendary RMs - Ramsey, John. The Swapmeet and Toyfair Catalogue of British Diecast Model Toys. Swapmeet Toys and Models Ltd. p. 29. References RM 1950s cars Rear-wheel-drive vehicles Luxury vehicles Executive cars Sedans Convertibles Cars introduced in 1945