Selection Of Valve Seat Finishing Materials

If you don’t maintain your auto parts, you will soon notice wear and corrosion over time that result in compression leaks, high temperatures and valve failure. In case valve seat inserts don’t have the right amount of interference fit inside the cylinder head, there are chances that seat may loosen up and fall out damaging the head, valve and piston. This can be happened in any aluminium cylinder head with iron, powder metal or alloy valve seats, especially when the heat gets hotter due to a cooling or pre-ignition issue.

Seat failures usually happened between 60,000 and 80,000 miles due to overheating. Valve seats are among critical components used in the cylinder head. These components are also known as the heart of the engine as the valve must form the perfect seal on the valve seat face to ensure maximum engine efficiency and the deliverance of rated power and fuel efficiency. Valve seats also function as heat sink for the thin valve seating face to protect the valve from burning and destruction.

Manufacturers are particular about the material selection for producing valve seat inserts. The raw materials and their properties play critical role in the function and longevity of the valve seat and inserts. The valve seat is subjected to a sophisticated cycle of heat treatment to ensure the right microstructure and hardness. This material must be able to withstand different temperature ranges from cold to hot without compromising their interference fit. This will ensure that no dislocation will occur during operation.
There are manufacturers using a few couple thousandths of interference while installing valve seats in a brand new cylinder head. There has been no wear, corrosion, or motion to distort the valve seat.

Valve Seat Alloys

Supplier of valve seat makes a big deal about the benefits of their proprietary alloy. The wear resistance, hardness, and strength along with thermal properties of a valve seat alloy can make or break it according to the application.

If an alloy lacks in hardness and wear resistance and unable to withstands high heat, the high-load engine application won’t be able to hold up well. This same case happens if there are dry fuel applications that require special alloy seats.

These are some critical facts that valve seats inserts manufacturers consider while commencing production for valve seats and inserts. If you need more details about the manufacturing process and technology they use for valve seat inserts, ask them directly.