of at 4,250 rpm, and built under license in Turkey for many years. It is still widely used on narrowboats on the canals of the UK. 1969 Probe 16 1962–80 MGB 1964–75 BMC ADO17 ("Landcrab") Austin 1800 1967–72 BMC ADO17 ("Landcrab") Wolseley 18/85 1966–75 BMC ADO17 ("Landcrab") Morris 1800 1975–78 Princess 1.8 1971–78 Morris Marina 1.8 1964–67 TVR Grantura Mark III and IV 1964-65 Elva Courier Mark IV 1974–78 Leyland Sherpa van 1973–75 Hanomag F20, Hanomag F25, Hanomag F30, Hanomag F35 (de) 1973–77 Mercedes-Benz L207 1973–78 Mercedes-Benz L307 litre engines 2-litre B-Series prototype was designed by BMC engine-man Stan Johnson in 1964-65. This unit displaced 1,998 cc, power output was 106 hp and featured siamesed cylinder bores and offset conrods in order to use the existing 1.2/1.5-litre cylinder block. This engine never went beyond the prototype stage. litre engines There was a six-cylinder unit, named "Blue Streak", which was used in the Australian Austin Freeway and Wolseley 24/80. Engine numbering There were two series of engine numbers used; BMC changed the system at the end of 1956. Numbering system, 1936 to 1956 As an example numbers were of the style "BP15GB" followed by the engines serial number, where: BP = B series engine with P for pushrod (Overhead Valve) 15 = capacity G = MG (for full list of codes see reference below) B = This final letter denotes the engine version. Numbering system, 1957 to 1970 As an example numbers were of the style "15GB-U-H" plus a serial number, where: 15 = capacity G = MG (other letters were: A = Austin, B = Industrial, H = Miscellaneous, J = Commercial, M = Morris, R = Riley, V = Vanden Plas and W = Wolseley ) B = B series engine U = Central gear change (other letters were: A = Automatic, M = Manumatic clutch, N = Column change, O = Overdrive, P = Police, DA = Close ratio gearbox. Note letter A is in a smaller font size). H = High compression (alternatively L = Low compression) Numbering system, 1970 onwards Beginning in the early 1970s the numbering system was simplified to "18 V" plus a serial number, where 18 represents the capacity and V = vertical, i.e. longitudinal (in-line, not vee-arranged) engine with rear-wheel drive, and H = Horizontal, i.e. transverse engine with front-wheel drive. There was sometimes a country indicator after the first part of