It had been the first 4B1 engine to get released, and it absolutely was put in in the 2.four L product with the Outlander as well as the Delica D:five. The bore is 2mm wider than 4B10 and 4B11, making it a prolonged-stroke engine that has a lengthy stroke. The 4B11 and 4B10 are based on this engine, with decreased bore and stroke.1 12 months