If the injection pressure in a resin injection pultrusion process is not high enough, the resin or matrix might not be able to penetrate the fiber bed to completely wet out the fibers without voids.
12.
The injection pressure of the diesel fuel on the second-generation Multijet is limited to between psi ) on the 1.3 Multijet and bar ( psi ) on the 2.4 Multijet 20V.
13.
Engines using indirect injection generally have lower levels of knock than direct injection engine, due to the greater dispersal of oxygen in the combustion chamber and lower injection pressures providing a more complete mixing of fuel and air.
14.
With the success of hydraulic fracturing, also referered to as drag reducing properties on water to decrease frictional pressure losses, thereby maximizing bottom hole injection pressures allowing for a higher pressure from the same number of pump trucks.
15.
Since the fuel pressure energy is stored remotely and the injectors are electrically actuated, the injection pressure at the start and end of injection is very near the pressure in the accumulator ( rail ), thus producing a square injection rate.
16.
In the diesel sector, the L5 2.4 was re-engineered with Multi-Jet technology which allows up to 5 injections per cycle, second stage common rail, with maximum injection pressure of 1400 bar and 4 valves per cylinder, to output a class leading.
17.
This engine further improves the existing 2.0 Multijet in various areas, such as a higher injection pressure ( 2, 000 Bar instead of 1, 600 Bar ) with Injector Rate Shaping, an oil pump with variable displacement and counterbalance-shafts to reduce noises and vibrations.
18.
While Pumpe D�se engines had a significantly higher injection pressure than older engines, they are slightly less refined when compared to the very latest common rail and, with the original solenoid-operated unit injectors, were not able to control injection timing as precisely ( a major factor in improving emissions ).
19.
They have also identified FAME as being the cause of the following problems : corrosion of fuel injection components, low-pressure fuel system blockage, increased dilution and polymerization of engine sump oil, pump seizures due to high fuel viscosity at low temperature, increased injection pressure, elastomeric seal failures and fuel injector spray blockage.
20.
A combination of improved mechanical technology such as multi-stage injectors which fire a short " pilot charge " of fuel into the cylinder to initiate combustion before delivering the main fuel charge, higher injection pressures that have improved the atomisation of fuel into smaller droplets, and electronic control ( which can adjust the timing and length of the injection process to optimise it for all speeds and temperatures ), have partially mitigated these problems in the latest generation of common-rail designs, while improving engine efficiency.
