2.1-Liter Engines: Honda Motor Company only ever produced a single 2.1-liter engine and it resided in the B engine class. This engine was only used in the early to mid-1990s before it was discontinued.
B21A1 - Manufactured by Honda for use in the 1990-1991 Honda Prelude Si, this was an engine built for performance at the time. It produced 140 horsepower from the factory and had a compression ratio of 9.4:1.