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| Symbol | Description |
|
| P | Pressure |
| Density |
| E | Elastic modulus |
| Fuel flow rate per unit time |
| Fuel flow through the orifice |
| C | Flow coefficient of fuel |
| A | Area of small orifice |
| t | Time |
| Polar radius of cam |
| Polar angle of cam |
| Fuel density in plunger housing |
| Density when plunger moves to bottom dead center |
| Density when plunger moves to top dead center |
| Volume of plunger housing |
| Volume when plunger moves to bottom dead center |
| Volume when plunger moves to top dead center |
| Diameter of plunger housing |
| Diameter of small orifice at fuel inlet |
| Area of small orifice at fuel inlet |
| Cam rotating speed |
| l | Length of high-pressure fuel line |
| d | Diameter of high-pressure fuel line |
| Internal combustion pressure in high-pressure fuel line |
| Volume of high-pressure fuel line |
| Fuel density in high-pressure fuel line |
| Stable pressure in high-pressure fuel line |
| Amount of oil into high-pressure fuel line per circle of cam rotation |
| Diameter of fuel injector needle valve |
| Diameter of the lowest nozzle of fuel injector(s) |
| Half-angle of fuel injector seal seat |
| h | Lift of needle valve |
| Area of fuel injector opening |
| Diameter of pressure reducing valve outlet |
| Threshold of pressure reducing valve |
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