en:Car Terms:M:Multi-Valve Technique COM/EN

SEAT Glossary

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Multi-Valve Technique

More valves per cylinder lead to more performance: by using more valves, larger inlet and outlet cross-sections can be attained. This way more fuel-air mixture reaches the combustion chamber. Nowadays, using this technique, priority is given to better exhaust emissions and reducing fuel consumption. Various design types are commonly used:

  • three-valve engine:
    two inlet valves, one outlet valve per cylinder
  • four-valve engine:
    two inlet and two outlet valves
  • five-valve engine
    three inlet valves and two outlet valves