Engine Camshaft & Valvetrain

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Camshaft & Valvetrain
Camshaft & Valvetrain

The camshaft and valvetrain are essential components on an engine. The camshaft and parts of the valvetrain work together to control which valves are allowed to open and close at a specific time. These valves are opened and closed to draw in fuel and air, or to expel the burned exhaust gas at the correct moment in the combustion cycle. All of these components are essential for sufficient engine combustion to occur.



Related Items

Engine Belt Drives

The belt drive which is essential to the valvetrain and all of its components is usually referred to as a timing belt. This belt connects the crankshaft to the camshaft which will then open or close all of the valves on the engine at the appropriate time. It is important that all valves are opening at the proper time to prevent too much or too little fuel making it through the valve, and to ensure that all the exhaust gases make it out of the valve at the correct time. Proper synchronization of this belt is necessary when replacing the belt to ensure the pistons are valves are working together efficiently. A timing belt drive that is not set up properly can cause catastrophic to the engine and its components. Continue Reading -->

Engine Belt Drives
Engine Belt Drives


Engine Camshaft Buttons

Camshaft buttons are used on many newer engines to keep the camshaft from coming loose. Almost every flat-tappet traditional camshaft has a slight angle on the lobe surface. This angle puts a slight load on the camshaft which keeps it wedged all the way back against the distributor. In the 1980’s, roller lifters started being used which allowed camshafts to be more aggressive. This added aggressiveness of the camshaft meant that the slight angle may not be able to hold the camshaft in place which is why the buttons were created. These new camshaft buttons were screwed into a threaded hole on the front of the shaft. This button would take up the extra space between the shaft and the timing cover which would help keep the shaft in place. Continue Reading -->

Engine Camshaft Buttons
Engine Camshaft Buttons

Engine Camshaft Lifters

Camshaft lifters are cylindrical shaped metal pieces which are located on the top of each lobe on the camshaft. As the camshaft turns within the engine, the lifters convert the energy produced by the camshaft's lobes into a lifting motion that pushes the pushrod which is sitting on the lifter up. As the lifter goes back down while riding on the camshaft lobe, the pushrod will also comes down which will close the valve in the cylinder head. Certain high performance camshaft lifters will boost low-end torque and increase the engine vacuum and fuel economy on almost any style of camshaft. These high end lifters are usually accommodated by a camshaft that has smaller lobes which reduces friction between the two components. Continue Reading -->

Engine Camshaft Lifters
Engine Camshaft Lifters


Engine Camshaft Lube

Camshaft lube is something that can vary in thickness and pliability depending on the personal preferences of the person installing the camshaft. Different lubes are also used depending on if the camshaft is being broken in, or if it is just being used for everyday use. Regular oil is one of the key lubricators of a camshaft once it has been broken in since it has good pliability and its thickness is just right. When breaking in the camshaft, a thinner lubricant can be used in conjunction with standard oil to make the transition easier. During the break in period of an engine, the camshaft and all of its components are more susceptible than ever to wear. The first few times that an engine is on can cause the amount of wear that years of running a vehicle can cause if it is not lubed properly. Continue Reading -->

 Engine Camshaft Lube
Engine Camshaft Lube

Engine Camshafts & Components

A camshaft is a vital component in an engine that is used to control the positioning of the poppet valves in the engine. It is vital that these valves are opened and closed at the right time to produce maximum efficiency and power out of the engine. The camshaft is basically a long metal rod that has lobes positioned on it. As the camshaft starts to spin, these irregular shaped lobes will spin which is what opens and closes the valves. Each valve on the engine will have its own lobe on the camshaft which allows valves to be opened and closed at different times. Continue Reading -->

Engine Camshafts & Components
Engine Camshafts & Components

Engine Pushrod Guide Plates

Pushrod guide plates are used are used to keep the pushrods on track which will help reduce wear and create a more efficient system. When replacing a pushrod, it is always a good idea to replace the guide plate since the two will have similar wear patterns and life spans. Guide plates for pushrods are especially recommended for high performance engines that put higher demands on the inside components. Continue Reading -->

Engine Pushrod Guide Plates
Engine Pushrod Guide Plates


Engine Pushrod Tubes

Pushrod tubes are an essential part in some engines and one of the main causes of oil leaks in the engine. During an engine rebuild, push rod tubes are often overlooked since they are not easily visible and can be hard to remove. Most new pushrod tubes are made out of aluminum which helps prevent corrosion which can occur easier in steel tubes. This corrosion is the main reason why older push rod tubes may leak. Continue Reading -->

Engine Pushrod Tubes
Engine Pushrod Tubes

Engine Pushrods

A pushrod is the component in the engine that rests in the top of a valve lifter and goes up into the rocker arm. As the lifter follows the cam lobe, the pushrod will actuate the rocker arm and move the valve which will open and close it to allow fuel, air, and exhaust to move in and out of the combustion chamber. The pushrod is also hollow which allows it to channel oil up from the lifter and out of the rocker arm. The oil is used to cool the valve spring and lubricate the rocker arm. Continue Reading -->

Engine Pushrods
Engine Pushrods

Engine Rocker Arms

A rocker arm is an oscillating lever that conveys radial movement from the cam lobe into linear movement to open the poppet valve. One end of the rocker arm is lowered and raided by the rotating lobes on the camshaft while the other end acts on the valve stem. As the camshaft lobe raises the outside of the rocker arm, the inside of the arm will press down on the valve stem which opens the valve. As the outside of the rocker arm starts to lower, the inside of the arm will lift which will allow the valve spring to close. The rocker arm is located inside the valve cover one the engine. Continue Reading -->

Engine Rocker Arms
Engine Rocker Arms


Engine Roller Rocker

A roller rocker is a rocker assembly that uses a bearing instead of a metal on metal setup. This needle roller bearing allows for a more efficient setup while creating less wear on the parts. Roller rockers can be used in both a pushrod and overhead cam engines which differ in design. In pushrod engines, the roller rocker employs the roller bearing were the rocker contacts the valve stem. On an overhead cam engine, the roller is used were the rocker contacts the cam. Continue Reading -->

Engine Roller Rocker
Engine Roller Rocker


Engine Rocker Arm Studs

Rocker arms studs are two way threaded screws that get screwed into the cylinder head which holds the rocker arm in place. Both sides of this bolt are threaded with one threaded side being longer than the other and a center area with no threading. The middle of the rocker arm studs will have a bolt like head which will allow for tightening when being put in the cylinder head. As the rocker arm stud is being tightened into place, it should not be able to wiggle side to side or have any unusual movement. This wobbling of the stud can indicate that the rocker arm geometry will be inconsistent once fully assembled. Continue Reading -->

 Engine Rocker Arm Studs
Engine Rocker Arm Studs


Engine Rocker Arms

Valve covers are the metal casings which are bolted to the cylinder head of the engine. These metal casings protect the oil inside the engine from being contaminated. This will help prolong the life of the oil and components which rely on it to operate properly. Contaminated oil runs the risk of turning into a liquid abrasive rather than a lubricant which is what the engine uses it as. The valve covers also ensure that the oil doesn’t spill out of the engine which could cause damage to parts inside and outside of the engine. Some older vehicles may not use valve covers because the rocker arms which are under the cover needed to be oiled frequently. Continue Reading -->

Engine Valve Covers
Engine Valve Covers

Engine Valve Guides

Valve guides are used for each poppet valve in the cylinder head in almost every engine. These guides help ensure that the valve makes a proper connection with the valve seat as it closes. Valve guides are tube shaped pieces of metal that are pressed into the cylinder head so that the valve is reciprocating inside it. Valve guides are also used to conduct heat which is created by the combustion process and the hot exhaust gasses being released. Valve guides are commonly made out of either steel or bronze which provides a balance between stiffness and wear to ensure a long service life for both the valve and its guide. Continue Reading -->

Engine Valve Guides
Engine Valve Guides


Engine Valve Lash Caps

Valve lash caps are designed to fit flush on the end of a valve stem. Fitting the valve tip with one of these caps will protect it from mushrooming due to the extreme amounts of wear and spring pressure which the valve constantly encounters. Valve lash caps are made out a very strong metal such as steel alloy which can stand up to all the abuse without transferring any damage to the valve. The valve lash caps are usually heat treated to help protect against corrosion. Continue Reading -->

Engine Valve Lash Caps
Engine Valve Lash Caps


Engine Valve Locks

Valves locks are placed on each valve stem to keep them in place. These locks come in many different sizes to fit many different size valve stems. They are also categorized by the angle they are set at which is critical when finding one that fits properly. The most popular and standard size for these locks is 7 and 10 degrees. These locks come in two pieces which are pushed together around the valve stem. A slight gap between the locks indicates a correct size lock, while no gap between the locks would indicate that to large of a lock is being used. Continue Reading -->

Engine Valve Locks
Engine Valve Locks


Engine Valve Seals

The valve seal plays a critical rule in the sealing of an engines combustion chamber. A tightly sealed combustion chamber will help keep a steady compression ratio that will ensure a more efficient running engine that lasts a long time. There are different types of valve seals that are located at the top and bottom of the engine. The two main types of valve seals in the engine include the upper and lower cylinder seal. They both help control oil flow to parts of the engine that need oil to operate. Different designed and size valve seals are available which will allow more or less oil past the seal which can be used for things such as lubrication or cooling. Continue Reading -->

Engine Valve Seals
Engine Valve Seals


Engine Valve Shims

Valve shimming is the process of placing small disk shaped metal objects under the valve bucket to compensate for lost clearance do to wear. This added shim acts as a spacer to keep the space between the bottom of the cam and the top of the valve bucket at the right distance. As the valves in the engine wear out, the clearance gets tighter which means that a thinner shim is needed under the bucket to keep the correct amount of clearance. Continue Reading -->

Engine Valve Shims
Engine Valve Shims


Engine Valve Spring Retainers

Valve spring retainers are used on top of the valve spring to ensure that it’s positioning and pressure stay constant. These retainers are circular pieces of metal with a diameter a little larger than the spring it is being installed on. This gives the spring a surface to distribute its built up energy evenly which will keep it from losing its hardness and shape. The inner side of the retainer will usually have circular channels to hold the spring in place. These channels also prevent the spring from sliding out under the retainer as it experiences constant changes in pressure. Some retainers will have multiple channels indented in them to support a wide variety of different size springs. Continue Reading -->

Engine Valve Spring Retainers
Engine Valve Spring Retainers


Engine Valve Springs

Valve springs on an engine are one of the most overlooked and critical components on an engine. The spring’s job is to keep the valves closed tightly against their seats until the camshaft opens the valves, which will release their pressure buildup. As the camshaft progresses through its motion, the valve will be released and quickly closed by the pressure built up in the spring. With the various amounts of springs on the market, it is common to have one installed that is not seeking the full efficiency that the engine can produce. Valve springs are categorized based on their pressure, diameter, and maximum lift. Continue Reading -->

Engine Valve Springs
Engine Valve Springs


Engine Valves

There are two main different types of valves on a vehicle which include intake valves and exhaust valves. The intake valves control the amount of air/fuel mixture allowed into the combustion chamber. After a set amount of air and fuel has been put into the combustion chamber, the valve will close. This mixture is then compressed and ignited by the spark plug to produce combustion. The spent mixture is then sent out of the cylinder through the exhaust valve. This process is repeated time and time again which keeps the combustion process going. Continue Reading -->

Engine Valves
Engine Valves

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