BL R-series engine fitted to the Maestro with the carburettor facing the front of the car, which also led to a reputation for carburettor icing in cold weather. The endemic problem of crankshaft failure was later attributed to flexing of the crankcase – because the E series relied upon the heavy sump/transmission unit to give additional strength to the cylinder block casting, this caused problems when a plain sump was bolted in its place. The R series was superseded in 1984 by the S series. BL R-series engine The R series is a line of petrol engines introduced by British Leyland in 1983
BL Lacertae object a blazar subtype. All known BL Lacs are associated with core dominated radio sources, many of them exhibiting superluminal motion. The blazar category encompasses all quasars oriented with the relativistic jet directed at the observer giving a unique radio emission spectrum. This includes both radio quiet AGN (BL Lacs) along with optically violent variable (OVV) quasars, however in general practice, "Blazar" and "BL Lac Object" are often used interchangeably. OVV quasars are generally more luminous and have stronger emission lines than BL Lac objects. Some examples of BL Lac objects are BL Lacertae itself, OJ 287, AP Librae, PKS 2155-304,