1950-1953: 1.5L supercharged or 4.5L atmospheric
1954-1961: 0.5L supercharged or 2.5L atmospheric
1962-1965: 1.5L atmospheric; min. 450 kg
1966-1984: 1.5L turbocharged or 3.0L atmospheric; min. 500 kg
1985-1986: 1.5L turbocharged or 3.0L atmospheric; max. 12 cil.; min. 500 kg; 220L fuel max.
1987-1988: 1.0L turbocharged or 3.5L atmospheric; max. 12 cil.; min. 500 kg; 220L fuel max.
1989-1994: 3.5L atmospheric; max. 12 cil.; min. 500 kg; 150L fuel max.
1995-1999: 3.0L atmospheric; max. 12 cil.; min. 500 kg; 150L fuel max.
2000-2005: 3.0L atmospheric; 10 cil.; min. 500 kg; 150L fuel max.
