C9 Used Camshaft 242 - 0673 For Excavator E330D E336D Original
Specification
| Item name | Engine Camshaft |
| Geer quantity | 100 |
| Application | Engineering Machinery Engine |
| Camshaft code | 242 - 0673 |
| Geer number | 224 - 3247 |
| Engine type | Diesel |
| Injection | Electric injection |
| Size | Standard |
Description
What does duration of camshaft mean?
Camshaft duration is the period of time, measured in degrees of
crankshaft rotation, that a valve is open. “Advertised duration”
measures duration from the point where the cam manufacturer
believes the lobe starts raising the lifter. This is called the
checking height and it varies from manufacturer to manufacturer.
Design
Base Circle
The base circle is the round portion of the cam lobe where the
valve lash adjustments are made. A slight high spot on the base
circle is called base circle runout.
Cam Lift
This is the maximum distance that the cam lobe pushes the lifter.
Because the rocker arm ratio will multiply the overall valve lift,
this should not to be confused with valve lift.
Cam Profile
The cam profile is the actual shape of the camshaft lobe. A flat
tappet camshaft is slightly more pointed on the nose of the lobe,
while a roller lift camshaft has a more rounded profile on the nose
of the lobe.
Degreeing the Camshaft
This is a process that synchronizes the camshaft with the
crankshaft. For best engine performance, builders use a degree
wheel to dial in this measurement. Most manufacturers will list the
exact specifications for each cam on the cam card.
Duration
The length of time the valve is held off the valve seat from the
cam lobe. This is measured in degrees of crankshaft rotation.
Duration at .050-inch Lift
This is the distance measured in degrees of crankshaft rotation
from when the valve is open at .050-inches until it’s .050-inches
from closing.
Gross Lift (Valve Lift)
Typically camshaft manufacturers list this measurement by
multiplying the cam lobe lift by the stock rocker arm ratio,
usually 1.5:1. For example, if your cam lobe lift is .319 and
you're using a 1.5:1 rocker arm ratio, you can take .319 x 1.5,
which is .479 inches of overall valve lift.
