B2

With the B2, Alpina provided BMW drivers from 1971 onwards racing technology on public roads. These cars are very special because they represent the early “Alpina tuning era” before the Buchloe-based company from 1978 onwards became a manufacturer with turbo engines and more luxury.

Little official data is available about the B2 engines, but most sources agree on the following. During the 1970s, the Buchloe-based company built 192 of these souped up engines based on BMW’s M30. These were distributed across the E3, E9 (40 units), E12, and E24. BMW dealers were also able to install them.

The B2 included, among other things, an increase in displacement to 3.0L, forged racing pistons, lightweight and balanced connecting rods, a 300-degree camshaft, a nitrided and balanced crankshaft, and a lighter flywheel. The mixture was prepared by three Solex or Weber twin racing carburetors and an extended radiator package was used to cool the engine.

B2S

In addition, there was the B2S, about which even less is known. These engines were intended for the racetrack or export and therefore allegedly did not have TÜV approval. Some of the above-mentioned features are said to be specific to the ‘S’, but various sources disagree on this.

Things like an Alpina sports transmission, Alpina sports suspension, and other goodies from Buchloe could be ordered as extras.

Technical Data Alpina B2(S)