It had been the very first 4B1 engine to generally be introduced, and it absolutely was installed while in the two.four L product in the Outlander and the Delica D:5. The bore is 2mm wider than 4B10 and 4B11, which makes it a extensive-stroke engine that has a long stroke. The 4B11 and 4B10 are determined by this engine, with lessened bore a