How do you read camshafts?
To understand what a camshaft is, you need to know all of the terminology. Base Circle: The lowest point in the lobe when the valve is fully closed. Ramp: The part of the lobe where the valve is beginning to open or beginning to close. The ramp’s design determines how quickly or slowly the valve opens or closes.
What is the function of the exhaust camshaft?
The exhaust camshaft assumes a control function for the decompression of the cylinder. At a low rotational speed of the engine, the exhaust camshaft briefly lifts the exhaust valve during each stroke, so that the compressed air can exit and the engine starts easier. Additionally, what are the symptoms of a bad camshaft?
How is the intake camshaft connected to the crankshaft?
A camshaft on an internal combustion heat engine is a device that controls both the input of fuel and the expulsion of exhaust fumes. It consists of several radial cams, each displacing intake or exhaust valves. This camshaft is connected to the crankshaft via belt, chain or gears.
How are the specs written on a camshaft?
To eliminate confusion, the spec is written as -1 degrees. This makes the math simple as 51 + 180 + (-1) = 230 degrees as listed on the card’s right column under the Duration heading. The column just before Duration on this Summit Racing camshaft card is something called Lobe CL or Lobe Center Line.
Why are exhaust valves shorter than intake valves?
The exhaust valves are actuated by the outlet camshaft as well as the intake camshaft. Exhaust valves often have a shorter cam stroke than intake camshafts, which can be attributed to the higher pressure difference at the exhaust for discharging combusted gases.
How can you tell if a camshaft has been advanced?
There is a very easy way to tell if the camshaft has been advanced by the cam company when the cam was machined. Look at the cam timing card and compare the lobe separation angle (LSA) with the intake centerline number. If the numbers are the same, then the camshaft has not been advanced. Let’s look at an example.
Why does a DOHC engine use a separate camshaft?
Since a DOHC engine uses a separate intake and exhaust camshaft, this allows engineers to move the intake and exhaust lobes separately. So now with hydraulic adjusters, the ECU can move either cam separately to advance or retard the intake or exhaust.
What is the purpose of a camshaft in a car?
The camshaft also turns clockwise if connected via sprockets and chain. It turns counterclockwise when connected by gears. The purpose of the cam is to operate the valves in the correct sequence in relation to piston movement. Click on this link for some cool Camshaft Animations.
Can a 4.7 engine be installed with a camshaft?
It is recommended that BOTH the manifold and the camshafts be installed together if doing this upgrade (not just one or the other). Quite a few Dodge truck owners have successfully installed the manifold and cams into their standard 4.7 engines without any major problems.