| A) Turbocharged, direct drive, water-cooled, horizontally opposed, carbureted |
| B) Normally aspirated, direct drive, air-cooled, horizontally opposed, fuel injected |
| C) Turbocharged, chain drive, water-cooled, horizontally opposed, carbureted |
| D) Normally aspirated, belt drive, air-cooled, vertically opposed, fuel injected |