4BG1 Diesel Used Engine Assembly For Excavator EX120 - 6 SK120 - 5
Water Cooling
Specification
| Car name: Complete Engine | Model Number: 4BG1 |
| Cylinder stroke: 102 | Cylinder diameter: 93 |
| Application: Excavator | valve: 8 valve |
| Cooling: Water cooling | Injection: Direction |
Description
Diesel Engine Principle and Working Cycle Explained:
Basically, there are two types of diesel engine types - the Four
Stroke and Two Stroke. The 'Diesel Cycle' uses higher
Compression-Ratio. It was named after German engineer Rudolph
Diesel, who invented and developed first Four-Stroke diesel engine.
The four strokes of the diesel cycle are similar to that of a
petrol engine. However, the 'Diesel Cycle' considerably defers by
the way the fuel system supplies the diesel the engine and ignites
it.
A conventional internal combustion diesel engine works on 'Diesel
Cycle'. In the simple diesel engines, an injector injects diesel
into the combustion chamber above the piston directly. The
'Compression-Ignition engine' is also another name for the Diesel
engine. This is mainly because it burns the diesel with hot and
compressed air.
The temperature of the air inside the combustion chamber rises to
above 400°c to 800°c. This, in turn, ignites the diesel injected
into the combustion chamber. Thus, the 'Diesel Cycle' does not use
an external mechanism such as a spark-plug to ignite the air-fuel
mixture.
Start
A small number use resistive grid heaters in the intake manifold to
warm the inlet air until the engine reaches operating temperature.
Engine block heaters (electric resistive heaters in the engine
block) plugged into the utility grid are often used when an engine
is shut down for extended periods (more than an hour) in cold
weather to reduce startup time and engine wear.
governor
A vital component of any diesel engine system is the governor,
which limits the speed of the engine by controlling the rate of
fuel delivery. Unlike a petrol (gasoline) engine, the incoming air
is not throttled, so the engine would overspeed if this was not
done. Older governors were driven by a gear system from the engine
(and thus supplied fuel only linearly with engine speed). Modern
electronically-controlled engines achieve this through the
electronic control module (ECM) or electronic control unit (ECU) -
the engine-mounted "computer".
The ECM/ECU receives an engine speed signal from a sensor and then
using its algorithms [1] and look-up calibration tables stored in
the ECM/ECU, it controls the amount of fuel and its timing (the
"start of injection") through electric or hydraulic actuators to
maintain engine speed.
