Isuzu R engine

The Isuzu R engine is a family of large six-cylinder diesel engines, listed in the six-cylinder diesel table of the Wikipedia list of Isuzu engines. The 6RA1 has a bore of 135 mm, a stroke of 140 mm and a displacement of 12,024 cc, with 285 PS for the turbocharged version. The 6RB1 has a bore of 135 mm, a stroke of 160 mm and displaces 13,741 cc, rated at 320 PS as the 6RB1-TC1 and 340 PS as the 6RB1-T1. The 6RB2 is listed at 275 PS at 2,700 rpm. The overview of the list says that Isuzu engine designations carry a two-character prefix that gives the number of cylinders and the engine family. The list gives no dates or applications for the R family.