At first Alpina offered a choice of four different engines.
The engines were all four cylinder and the models were:

• the A1/3 (120 bhp)
• the A2/3 (150 bhp)
• the A4/3 (160 bhp)
• the A4S/3 (170 bhp)

These engines were similar to the earlier versions fitted to the 02 series cars, with only small changes.
Alpina four cylinder engines for 3-series cars were identified by their "/3" designations.
They also produced the C1 with a 6-cylinder engine. It had a 2,3 litre, 170 bhp engine and its performance were equal to the A4/3 but the C1 had considerably greater refinement. On a couple of the pictures below is a very rare model, a C1 2,3 based on a Baur cabriolet.