MAS (Milan)

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MAS was an Italian motorcycle manufacturer from 1920 until 1956.

MAS stood, in the context, for "Alberico Seiling Motorcycles" (Motocicli Alberico Seiling).

Seiling was an Italian constructor who developed a variety of motorbikes between 1920 and 1922, and in 1922 started commercial production. His 173 cc overhead valve (OHV) model with an external flywheel proved particularly popular. He also produced a single-cylinder 498 cc OHV model, and from 1928 a twin-cylinder model, also with 498 cc of displacement.

In 1937 an OLHV model with a special cylinder head appeared, with a vertically mounted camshaft, the cylinder valves set horizontally in a separate chamber above the combustion chamber. The combustion mixture was premixed in this separate chamber. By excluding the valves from the combustion chamber itself it was possible to use a 15:1 compression ratio which was by the standards of the time very high. The motor was not a success, however.

Seiling sold the MAS business to the Guidetti brothers in 1938. After this he continued to produce motor cycles in his own name (Seiling: A. Scoppio S.A.) and then, in 1939, he obtained finance to establish a new motorcycle manufacturing business under the name Altea. Altea produced a single-cylinder ohv 198 cc machine. However, this business ended in 1941 due to the general war which had by then broken out across most of Europe.

## See also

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## References

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Major and notable Italian motorcycle marques

Current|

* Aprilia
* Askoll
* Benelli
* Beta
* Bimota
* Borile
* Cagiva
* Di Blasi Industriale
* Ducati
* Energica
* Fantic
* Ghezzi & Brian
* Gilera
* Garelli
* Italjet
* KRC Motors
* Lamborghini
* Magni
* Minarelli
* Mondial
* Moto Guzzi
* Moto Morini
* MV Agusta
* Paton
* Piaggio
* Polini
* SWM
* Tacita
* Terra Modena
* TM Racing
* Vespa
* Vyrus

Defunct|

* Abra (1923–1927)
* Accossato
* Aermacchi
* Aeromere/Capriolo
* Aetos
* Agrati (1958–1965)
* AIM (1974–1982)
* Alano (1923–1925)
* Alato (1923–1925)
* Aldbert (1953–1959)
* Atala
* Autozodiaco
* Bianchi
* Caproni
* Ceccato (1947–1962)
* Cimatti (1937–1984)
* CNA (1920–1934)
* Della Ferrera (1909–1948)
* Frera (1905–1936)
* Fusi (1932–1957)
* Galbusera (1934–1955)
* Innocenti
* Iso Rivolta (1953–1974)
* Itom (1944–1975)
* Lambretta
* Laverda (1949–2006)
* Malaguti
* Malanca (1956–1986)
* MAS (1920–1956)
* Maserati (motorcycle)
* Morbidelli
* Moretti (1934–1952)
* Motobi
* Parilla (1946–1967)
* Rumi
* Santamaria

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