For development projects miniature sensors are used. These are available in various forms to allow a high standard of measurement to be achieved with minimum adaptation. Other solutions completely avoid the need for cylinder head modification:
Kistler incorporates the sensor in a spark plug or glow plug.
The company provides measuring spark plugs in numerous different sizes, and with various types of electrode and heat values.
For diesel engines Kistler supplies serviceable glow plugs and matching adapters with built-in pressure sensor. This measurement method also allows safe and cost-effective access to the combustion chamber.