Nissan's sidevalve engines were based on the Austin 7 engine, with which they shared the stroke. The series began with a 495 cc iteration for the 1930 Datson Type 10 and ended with the 860 cc Type 10 engine which was built until 1964 for light commercial vehicles. Later versions were called the B-1, before being replaced in 1957 by the OHV Nissan C engine that was essentially a de-stroked version of another Austin design this time the BMC B-Series. DAT 495 cc The displacement of the original version was kept beneath a half litre since driver's licenses were not required for such cars after a ministerial decision of 1930. The engine was a square design, with a bore and stroke of . Maximum power was at 3700 rpm. Applications 1930-1931 Datson Type 10 1932 Datsun Type 11 DAT 747 cc For 1933, the rule regarding drivers' licenses was changed so that cars of up to 750 cc could be driven without a license. Accordingly, Datsun modified their engine which now displaced from a bore and stroke of . These dimensions are exactly the same as those of the Austin 7. It produced at 3000 rpm, although this later increased to . 1933-1934 Datsun Type 12 1934-1935 Datsun Type 13/13T Type 7 This engine is a flat-head side valve automobile engine, a supposedly new design which was slightly smaller but also slightly more powerful than the earlier DAT engine. Bore and stroke were nearly the same as for the earlier version, at . Power is ; in 1936 the engine was upgraded to produce . Postwar cars again claimed , at 3600 rpm. Applications 1935-1936 Datsun Type 14/14T 1936-1937 Datsun Type 15 1936-1938 Datsun Type 15T 1937-1938 Datsun Type 16 1938-? Datsun Type 17 1938-? Datsun Type 17T 1946 Datsun 1121 1947-1949 Datsun 2124 1947-1948 Datsun DA 1949 Datsun 3135 1949-1950 Datsun DB-2/DW-2 1950 Datsun DS 1950-1951 Datsun 4146 Truck 1951-1952 Datsun DS-2 Thrift 1951-1953 Datsun DB-4/DW-4/DV-4 1951-1953 Datsun 5147 Truck 1952-1953 Datsun DS-4 Thrift Type 10 The Datsun Type 10 engine was a engine is a flat-head side valve automobile engine produced from 1952 through 1964. Bore and stroke was in the undersquare British style. Later on, the engine's name was abbreviated to D-10. Output was originally for the DC-3, but this increased to at 4000 rpm and at 2400 rpm in 1953 thanks to an increased compression ratio