What is the effect to an engine if the opening pressure of an injection nozzle is very high?

An injection pressure increase enhances mixture formation as well as combustion. Decreasing the hydraulic flow rate, by means of reducing spray hole orifice diameter, affects mixture formation primarily through improved gas entrainment processes.

What is nozzle opening pressure?

The nozzle opening pressure of fuel injection systems affects the initial fuel atomization, the fuel injection quantity, the emission characteristics and the operation stability of diesel engines. Based on this model, the effects of some factors on the nozzle opening pressure are analysed.

What is injector opening pressure?

The injector opening pressure (IOP) is varied from 200 bar (manufacturer specified value) to 260 bar in steps of 20 bar. The combustion parameters of HOME (IOP 260 bar) are found to be very close to ND. For other IOPs, these combustion parameters deviated compared to ND. For other IOPs, BTE is inferior compared to ND.

How can higher than specified fuel pressure affect engine performance?

Symptoms of High Fuel Pressure When an engine “runs rich” it means that the air to fuel ratio is not at an optimal level and, instead, there is too much fuel and not enough air. This results in poor gas mileage, among other, more long-term consequences. An engine runs rich especially when accelerating.

How does water affect diesel fuel and how is the water removed?

When diesel fuel contaminated with water is pumped from a fuel tank, the water leaves the tank as visible floating droplets which are relatively easy to remove from the fuel using a quality fuel/water separator.

What causes damage to fuel injectors?

Fuel injectors typically fail due to a buildup of contaminants such as carbon. Carbon build-up can cause a clogged or partially clogged injector, preventing the injector from closing all the way. Fuel injectors can also leak externally as a result of dry, cracked rubber seals, or cracks within the injector itself.

What is difference between injector and nozzle?

As nouns the difference between injector and nozzle is that injector is any of various devices that are used to inject something while nozzle is a short tube, usually tapering, forming the vent of a hose or pipe.

What will the effect be if you have a fuel injector valve that is dripping after the injection is finished?

Leaking fuel injectors can cause Oil Thinning At engine shutdown the fuel pressure should maintain operating pressure or just below that for a substantial period of time.

What happens if fuel pressure is high?

Too high of pressure may result in, over fueling of the engine. As a result, this can lead to a rough running engine; poor fuel mileage, and black smoke coming from the exhaust.

What causes incorrect fuel pressure?

Typical causes for low fuel pressure include a dirty fuel filter, weak pump, incorrect tank venting, restricted fuel lines, a clogged pump inlet strainer and faulty electrical control.

What happens when water in diesel fuel?

The presence of water in diesel fuel systems causes a variety of problems. Water rusts steel and iron components, forming loose particles of iron oxide. These rust particles can quickly clog fuel filters. Living bacteria pump out acids as a waste product, further corroding and damaging fuel system components.

What Causes water in diesel fuel?

Water is commonly found in diesel fuel due to many factors including condensation in fuel tanks, improper handling and environmental conditions. To minimise the damaging effects, water should be removed from diesel fuel prior to the final stages of solid particulate filtration.

What happens if the fuel injection pressure is too low?

When fuel injection pressure is low, fuel particle diameters will enlarge and ignition delay period during the combustion will increase. This situation leads to inefficient combustion in the engine and causes the increase in NOx, CO emissions.

What happens to fuel injectors when the engine is idling?

When an engine is idling, there is a vacuum in the intake manifold. This vacuum pulls fuel out of the injectors, and increases the effective pressure across the injector to a pressure higher than the rail pressure itself.

What is the difference between nozzle opening pressure and injection pressure?

The pressure difference created due to which the nozzle lifts up is known as the Nozzle opening pressure. The pressure at which the diesel is injected through the holes is known as Injection pressure.

What are the most dangerous components of the fuel injection system?

Another highly underestimated component of the fuel injection system is the pressure pipe. Despite its small size and apparent simplicity, Duap notes that the pipe has to endure pressure waves of up to 1800 bar; even the smallest mark may thus lead to fracture.