Product range

  • Cylinder heads for petrol and diesel engines in passenger cars and utility vehicles
  • Naked with valve guides and valve rings or ready to install with valves and camshaft

Product in focus – advantages

  • In combustion engines, the cylinder head sits above the pistons in the combustion chamber.
  • The cylinder head accommodates the key components for mechanical control of the gas exchange, including:
    • intake and exhaust ducts for charge exchange process
    • valves and accessories
    • rocker arms or finger type rockers
    • tappets
  • The cylinder head is one of the more complex components of a motor, requiring complex manufacturing processes. In addition to holding the described components, the cylinder
    head also has to fulfil the following tasks:
    • sealing the combustion chamber
    • absorbing the combustion power
    • supplying the moving components of the valve train
    • heat dissipation through coolant channels and cooling liquid with watercooled motors, or via large-scale cooling fins (blower) with air-cooled motors.
  • The combustion process that takes place in the cylinder exerts a high amount of force on the cylinder head, so it is vital that the tightening torques of cylinder head bolts always match those specified by the manufacturer.
  • The tightening sequence of the cylinder head bolts is important for preventing deformations. If the manufacturer’s instructions are not observed, harmful deformations may occur on the cylinder
    head, on the cylinder of the cylinder head gasket or on the valve seat inserts.

Versions

Passenger car cylinder heads

  • are available in grey cast iron or aluminium, depending on the engine type.
  • are available in user and repair-friendly versions either as a bare head (equipped with seat inserts and valve guides), as a cylinder head with fitted valves and valve-springs, or as a complete cylinder head with valves and camshafts.

Single cylinder heads

  • Individual cylinder heads are used in many utility vehicles.
  • There are various types, e.g. watercooled cylinder heads from grey cast iron (see picture left) and air-cooled cylinder heads from aluminium (see picture right).
  • The advantage is that they can be replaced individually in case of damage.

Multiple cylinder heads

Multiple heads are mainly used in passenger car engines, but are also used in utility vehicle engines.  V engines with multiple cylinder heads have one cylinder head for each cylinder line. In engines with multiple cylinder heads, camshafts are often accommodated in the cylinder head. Engines with multiple cylinder heads are always water-cooled by design.

Water-cooled cylinder heads

Modern engines are almost exclusively water-cooled with a coolant mixture of water and anti-freeze/anti-corrosion agent.

Advantages:

  • Water can absorb and dissipate larger quantities of heat.
  • Cooling ducts between the cylinders and cylinder head can achieve more effective cooling within the engine.

    Air-cooled cylinder heads

    The air is blown directly onto the engine. To increase the size of heat-dissipating surfaces, cylinders and cylinder heads in air-cooled engines have large cooling ribs.

    Advantages:

    • more straightforward, cost-effective construction method
    • more reliable operation
    • reduced weight
    • coolant does not freeze in low ambient temperatures

    Constant throttles

    All buses over 5.5 tonnes and trucks over 9 tonnes must be fitted with a continuous braking mechanism. With constant throttle or decompression brake, an additional valve is opened at the end of the compression cycle. The gases for compression are drawn into a separate chamber and then fed back into the combustion chamber or directly into the exhaust pipe. This ensures that no new pressure is exerted on the crankshaft during the combustion cycle, preventing new drive force from being generated. The valve is controlled pneumatically or hydraulically. The constant throttle helps to achieve a braking power of 14–20 W per litre displacement.

    Use of cookies and data protection

    Motorservice Group uses cookies saved to your device in order to optimize and continuously improve its websites, as well as for statistical purposes. Further information on our use of cookies can be found here, together with our publication details and data protection notice.

    By clicking on “OK” you confirm that you have taken note of the information on cookies, the data protection declaration and the publication details. You can also change your cookie settings for this website at any time.

    Privacy settings

    We place great importance on transparent information relating to all aspects of data protection. Our website contains detailed information on the settings you can select and what effect these settings have. You can change your selected settings at any time. Regardless of the selection you choose, we will not draw any conclusions regarding you as a person (except where you have explicitly entered your details). For information on deleting the cookies, please see the help function in your browser. You can find out more in the data protection declaration.

    Change your privacy settings by clicking on the corresponding buttons

    Necessary

    Cookies essential for the system ensure that the website works correctly. Without these cookies, malfunctions or error messages may occur.

    This website will:

    • Store cookies required by the system
    • Store the settings you make on this website

    This site wil never do the following without your agreement:

    • Store your settings, such as the language selection or cookie banner, so that you do not have to repeat them in the future.
    • Evaluate visits anonymously and draw conclusions to help us to optimize our website.
    • Draw conclusions regarding you as a person (except where you have explicitly entered your details, e.g. in contact forms)

    Convenience

    These cookies make the website easier to use and save settings, for example, so that you do not have to repeat them every time you visit the site.

    This website will:

    • Store cookies required by the system
    • Store your settings, such as the language selection or cookie banner, so that you do not have to repeat them in the future.

    This site wil never do the following without your agreement:

    • Evaluate visits anonymously and draw conclusions to help us to optimize our website.
    • Draw conclusions regarding you as a person (except where you have explicitly entered your details, e.g. in contact forms)

    Statistics

    Statistics cookies enable us to evaluate the usage behaviour on the website anonymously – without enabling any conclusions to be drawn about you as a person. This enables us to measure the performance of the website and to improve it continuously to offer a better user experience.

    This website will:

    • Store cookies required by the system
    • Draw conclusions regarding you as a person (except where you have explicitly entered your details, e.g. in contact forms)
    • Evaluate visits anonymously and draw conclusions to help us to optimize our website.

    This site wil never do the following without your agreement:

    • Draw conclusions regarding you as a person (except where you have explicitly entered your details, e.g. in contact forms)

    Of course, we will always respect the do-not-track (DNT) setting in your browser. In this case, no tracking cookies are set and no tracking functions are loaded.