What is jerk type fuel injection pump?
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What is jerk type fuel injection pump?
Definition of jerk pump : a fuel-injection pump in an oil engine which supplies impulsively an accurately metered charge to the nozzle at the time of the opening of the inlet valve.
How does a jerk pump work?
of pump elements and a camshaft are housed in the one casing. pressure through the delivery valve to the injector until the helical grove on the plunger uncovers the spill port. This allows the fuel pressure above the plunger to fall to the suction pressure through the vertical slot.
What are the two types of injection pump?
There are two types of fuel injection pump; the barrel cylinder type and the monoblock cylinder type.
How does vit work?
By controlling the injection timing of the fuel in the fuel delivery pump and advancing the fuel pump injection timing, VIT increases the maximum pressure in the engine.
What is spill port?
The spill-port timing control unit of known distribution type fuel injection pumps for Diesel engines comprises a spill ring movably mounted on the rotary plunger of the pump and a centrifugal governor that axially moves the ring to bring its spill port into alignment with a spill port of the plunger to allow …
How much PSI does an injection pump have?
Electric fuel pumps are normally used to supply the higher pressure demanded by the system. The required pressure can be as high as 66 psi with port injection. The pressure on the throttle body injection systems is between 9 and 18 psi.
What is zero setting in fuel pump?
ZERO SETTING means, the fuel plunger helix should be inline with the spill port so that there is no injection. This is ensured while assembling the rack in the sleeve of the plunger. One gear of the sleeve is slightly cut which should go in between the two cut gears of the rack, which ensures zero setting.
What are the types of fuel injector pump?
3 Types of Diesel Fuel Pumps
- Individual inline pump.
- Distributor pump type.
- Continuous pump.
What is injection timing?
What Is Injection Timing? Injection timing, also called spill timing, is the moment when diesel fuel enters the cylinder during the combustion phase. When you adjust the timing, you can alter when the engine injects the fuel, therefore changing when combustion occurs.
What is Super Vit in fuel pump?
It is a VIT method only, but used on B&W large engines like S-MC, K, L series engines. Super VIT = Adjustable Timings + Adjustable Break Point. > Break Point. It is the load point where the maximum cylinder pressure has been reached and injection timing has been advanced the most.
What is vit in fuel pump?
Variable Injection Timing (VIT) allows to achieve maximum combustion pressure during part load operation which helps in decreasing the fuel consumption and also achieve efficient combustion in the engine.
What is diesel spill timing?
Injection timing, also called spill timing, is the moment when diesel fuel enters the cylinder during the combustion phase. When you adjust the timing, you can alter when the engine injects the fuel, therefore changing when combustion occurs.
What is injection pump calibration?
A method of calibrating the injectors of an injection system for an internal combustion engine which can compensate for the different flow rates of the injectors fitted in the engine, which are due to the production tolerances of the injectors, in order to re-match the injectors with consequent balancing of the …
What is injection lag?
The time lag between generation of the pressure at the pump and the delivery of fuel into the cylinder is called injection lag, which must be considered as is attributes to two effects. One is the time taken for the wave, produced due to the compression of the fuel by the pump, to travel through the delivery pipe.
How does variable injection work in jerk type fuel pump?
For a simple jerk type fuel pump, start of fuel injection is fixed at the point at which the top of the plunger covers the spill port. End of injection, which is variable takes place when the edge of the helix uncovers the spill port.
