The Delta 2 diesel of 2.1 cc displacement was one of a number of functionally near-clones of the Swiss Dyno 1 diesel which appeared in Italy both during and immediately following WW2. The development of these engines stemmed from the 1942 appearance of two examples of the then-new Dyno 1 at the Italian National Championship meeting held that year at Asiago. Other examples included the MOVO D-2 and the Ercolino 2 cc model, details of which may be found elsewhere on this website.

The Delta 2 was a product of the Micromotor company of Busto Arsizio (Italian pronunciation busto arsit-sio)  a city and commune located in the Province of Varese in the Lombardy region of Northern Italy, some 34 kilometres (21 mi) north of Milan. The company adopted the rather unusual naming protocol of applying Greek letters to its successive designs in their alphabetical order. The Delta 2 was thus the second variant in the fourth series to be introduced by the company. It appeared in 1946, replacing a very similar but slightly lower-displacement model called the Delta 1 with which the company's Delta series had been initiated in 1945.

The Delta 2 was a basically conventional but elegantly-styled long-stroke sideport diesel displaying strong Dyno influence. Its various castings were produced in magnesium alloy. Interestingly enough, an almost identical model called the FRAM Delta 2 was introduced more or less concurrently by the completely separate FRAM company of Milan. It's possible that this engine was actually manufactured by Micomotor for FRAM and was simply subjected to the "badge engineering" process.

A full review and test of the Delta 2 will appear on this website in due course.