You may already know how the valves work in terms of the 4 Cycles of the 4 Stroke system, but this video explains the way in which they work. Basically, what actually powers them.
The Four Stroke Cycle Engine Inlet Valve and Exhaust Valve gain there movement from several special engine components deep within the engine sump, with the 4 stroke engine oil.
Link to Transformation video from old Lawnmower Engine to Educational Artifact: • How this Rusty Old Law...
In this video I am using a small air cooled four stroke petrol engine ( no turbos explained) from a lawnmower, which I modified to use as an educational artifact. I use the Lawn mower engine specifically because this channel is more about small engine repair than larger diesel engines. So I admit that my little engine is not exactly a V12.
A 4-stroke internal combustion engine's valve configuration is referred to as its 4-stroke valving system. Let's go over the four engine cycle strokes and how the valves function in each to better comprehend this:
Induction Stroke: The piston descends during the intake stroke, which results in a vacuum inside the cylinder. A 4-stroke engine's intake valve, which is usually an intake port, opens to let a mixture of fuel and air into the combustion chamber.
Compression Stroke: The fuel-air combination is compressed as the piston rises back to its starting position. At this moment, the combustion chamber is sealed by closing both the intake and exhaust valves.
Power Stroke: The spark plug ignites the compressed fuel-air mixture at the peak of the compression stroke, resulting in a controlled explosion. Gases that are expanding force the piston back down, producing power. Again, during this stroke, both valves are shut.
Exhaust Stroke: Following the power stroke, the exhaust valve opens as the piston ascends. This enables the cylinder to release the burned gases into the exhaust system. At this point in the stroke, the intake valve is still closed.
A 4-stroke engine's valves are normally opened at particular times during the engine cycle by a camshaft, which contains lobes that push the valves open. For an engine to run properly, valve opening and closing timing is essential.
Depending on the engine design, the valving system of a 4-stroke engine can change. Systems with overhead valves (OHV), overhead camshafts (OHC), and dual overhead camshafts (DOHC) are common layouts. In an OHV system, the camshaft and valves are both housed inside the engine block, and pushrods and rocker arms are used to operate the valves. Older engines or engines that place a premium on simplicity and durability frequently use this design.
The camshaft is located in the cylinder head above the valves in an OHC system. It uses cam followers or lifters to directly operate the valves. This design, which enables more exact control over valve timing, is frequently utilised in contemporary engines. One camshaft controls the intake valves, and the other controls the exhaust valves in a DOHC system. This design, which is frequently used in performance-oriented engines, enables considerably more control over valve timing.
In a 4-stroke engine, the valving system is vital for managing gas intake and exhaust during the engine cycle to ensure effective combustion and power output
Many tanks indeed
Craig Kirkman (Owner and Creator of The Repair Specialist Channel)
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