List of automobile engines

1. Flat-six engine or Horizontally opposed-six or Boxer engine 
2. Flat-twelve engine
3. Inline-twin engine or Straight-two engine or Vertical-twin or Parallel-twin
4. Inline-three engine or Straight-three engine or L3
5. Inline-four engine or Straight-four engine or Slant four or L4
6. Inline-five engine or Straight-five engine
7. Inline-six engine or Straight-six engine or Slant six or L6
8. Inline-eight engine or Straight-eight engine
9. V2 engine or V-twin engine
10. V6 engine
11. V8 engine
12. V10 engine
13. V12 engine
14. W12 engine
15. W16 engine