A fixied cylinder head, also known as a cast-iron or pressed steel cylinder head, is an engine component that integrates the cylinders, valves, and spark plugs. Commonly used in older vehicles due to affordability, they have several disadvantages compared to modern detachable heads.
- Difficult repairs: Integrated into the engine block, removing a fixied cylinder head for repairs is time-consuming and costly.
- Limited modifications: Modifying engines with fixied cylinder heads is challenging due to their non-detachability from the block.
- Reduced performance: The massiveness of fixied cylinder heads restricts heat dissipation and airflow, affecting engine efficiency and power output.
Notable examples include Volkswagen Beetle’s engine swap from air-cooled to water-cooled, made easier with detachable cylinder heads for improved modifications and performance. Renowned engine expert, Prof. Dr.-Ing. Hans-Werner Petereit, emphasizes the benefits of modern engines with detachable cylinder heads, including easier access, better performance, and efficient repairs (Petereit, H.-W.: Die Entwicklung der Motorenkühlung: Von der Luft- zur Wasserkühlung. Springer-Verlag, 2006).
Considering these disadvantages and benefits, a cylinder head upgrade may be worth considering for eligible vehicles. However, this is a complex and costly process best left to professionals.