What is a dual lobe camshaft?
What is a dual lobe camshaft?
A DUAL PATTERN: camshaft has an intake lobe profile design that differs from that of the exhaust lobe profile design. For example, camshaft “A” has intake lobes of 260 degrees duration while the exhaust lobes are 270 degrees duration. Camshaft “B”, has intake and exhaust lobes that are both at 260 degrees.
What means DOHC?
Dual Overhead Camshaft
To put it shortly, DOHC refers to Dual Overhead Camshaft, SOHC refers to Single Overhead Camshaft, and OHV refers to Overhead Valve. To better understand what these mean, it is important to know how a typical 4 stroke engine works (this is the type of engine you would find in any modern car).
What is the advantage of dual overhead cam?
The main benefit of dual overhead cams is that they allow an engine to have four valves per cylinder. Each camshaft operates two of the valves, one camshaft handles the intake valves, and one handles the exhaust valves.
What are lobes on a cam?
Cams located on the camshaft that open and close the intake and exhaust valves in time with the motion of the piston. Cam lobes control the valve lift, and there is a direct relationship between the shape of the cam lobes and the way the engine performs in different speed ranges.
Is there a one stroke engine?
One-stroke internal combustion engines may comprise reciprocating pistons which are either straight or rotary. Since four functions are performed simultaneously during one stroke, every stroke becomes a power stroke. In reality, 1-stroke engines are physically rearranged 4-stroke engines.
What are cam profiles?
The camshaft profile refers to the shape of the individual lobes. The camshaft pattern refers how the profile of the intake and exhaust lobes compare to each other.
What is SOHC in bike?
In modern motorcycle engines, valve springs provide the return force for the valves to pull back to their shut position once the lobe rotates away. When a single camshaft governs both intake and exhaust valves, the setup is commonly known as SOHC.
What is VVT iE?
VVT-iE (Variable Valve Timing – intelligent by Electric motor) is a version of Dual VVT-i that uses an electrically operated actuator to adjust and maintain intake camshaft timing. The exhaust camshaft timing is still controlled using a hydraulic actuator.
Does a cam give you more HP?
Does a camshaft increase horsepower? Yes, a camshaft adds 10 to 20 horsepower depending on the setup. To get the full potential of the high-performance camshaft, you’ll have to swap out additional components like the air intake, exhaust manifold, injectors, and valve heads.
What causes worn cam lobes?
This can be caused by a lifter being out of position and striking the lobe, weak valve spring pressure, lack of oil pressure, or from stressful operating conditions like overspeeding. There are other types of damage a camshaft or its associated parts can incur besides just lobe wear.
How do I know if my cam lobe is bad?
To help you prevent all of this, here are common camshaft wear symptoms to look out for:
- Active check engine light.
- Loud ticking or tapping sounds.
- Metal debris in the engine oil.
- Cylinder misfire.
- Increased emissions as a result of misfiring.
- Visible signs of damage.
