Engine valves are essential spare parts for internal combustion engines, as they allow air and fuel to flow in and out of the combustion chamber at the right time. There are two types of engine valves: intake and exhaust valves.
Another important aspect of engine valves is the way they are operated. There are two main types of valve actuation: overhead camshaft (OHC) and pushrod. OHC engines have the camshaft located above the valves and operate the valves directly, while pushrod engines have the camshaft located in the engine block and use pushrods and rocker arms to operate the valves.
INTAKE VALVES
Intake valves are responsible for allowing a mixture of air and fuel into the combustion chamber. They are usually larger than exhaust valves and are designed to open quickly and stay open longer. This allows a greater volume of air and fuel to enter into the combustion chamber, which can help to improve engine performance.
EXHAUST VALVES
Exhaust valves, on the other hand, are responsible for allowing exhaust gases to exit the combustion chamber. They are usually smaller than the intake valves and are designed to open and close quickly. This helps ensure that exhaust gases are quickly expelled from the combustion chamber, which can help to reduce emissions and improve fuel efficiency.
VALVE MEASUREMENTS
Valve measurements are important for several reasons. Firstly, they ensure that the valves are machined correctly and within specification. Secondly, valve measurements determine proper valve clearance, which is the space between the valve stem and the valve lifter or rocker arm. Proper valve clearance is essential for proper engine operation and can affect engine performance, emissions and fuel efficiency.
These are the most important measures: valve head diameter, stem diameter and length.
– The valve head diameter (D) is the width of the valve head, which is the part that seals against the valve seat. This measurement is important because it determines the size of the valve seat, which must be machined to match the size and shape of the valve head.
– The stem diameter (d) of a valve is the width of the valve stem, which is the part that connects the valve head to the valve spring. This measurement is important because it determines the size of the valve guide, which must be machined to match the size and shape of the valve stem.
– The length of a valve (L) is the distance from the valve head to the bottom of the valve stem. This measurement is important because it determines the overall height of the valve, which can affect the valve’s ability to seal properly and its ability to withstand the stresses of engine operation.
ANGLES AND SLOTS
Different angles and slots are used in engine valves to improve engine performance, efficiency and emissions.
A common angle used in engine valves is the seat angle, which refers to the angle between the valve face and the valve seat. The most common seat angles are 45 and 30 degrees. A 45-degree seat angle provides a greater contact area between the valve face and the seat, which can improve valve sealing and durability. A 30-degree seat angle, on the other hand, can provide better flow characteristics and can improve engine performance.
Valve slots are another feature used in engine valves. These slots can improve flow characteristics by reducing the amount of surface area that comes in contact with the cylinder wall. They can also help reduce the overall weight of the valve, which can improve valve response time and reduce valve train wear.
MATERIALS THAT COMPOSE THEM
There are two types of materials that compose them: magnetic and non-magnetic materials.
Magnetic materials are often used in intake valves, where faster response and more precise control of valve opening and closing is required. Magnetic materials can also be more resistant to fatigue and wear than non-magnetic materials.
On the other hand, non-magnetic materials are often used in exhaust valves, where high temperature resistance is more important than fast valve response. Non-magnetic materials may also have a higher corrosion resistance than magnetic materials.
At Oryx Parts we have a wide range of engine valves for tourism and industrial engines. Besides, we have the specifications that ensure a successful repair. Contact us!