Inline VE Diesel Injection Pump Test Bench for Plunger Rotary Systems

Mechanical inline pumps and VE rotary pumps are the two most classic fuel injection pump systems in traditional diesel engines.

1. Mechanical Inline Pump:

• One row of plungers, one plunger per cylinder.
• Representatives: B-osch PE, PW, P-type pumps; used in older Changchai/Xichai/Yuchai/Weichai engines.
• Structure: Plunger + Delivery Valve + Camshaft + Governor

2. VE Rotary Pump:

• Only one plunger, rotating to distribute fuel to each cylinder.
• Representatives: B-osch VE pump; favored in light trucks, pickups, small construction machinery, and 493/4JB1 engines.
• Structure: Single plunger, roller ring, advance mechanism, solenoid shut-off valve.

Application Scenarios (Most Practical Applications)

1. Mechanical Inline Pump – Heavy-Duty, High-Power
•  Used in:
Heavy-duty trucks: Weichai, Yuchai, Xichai, C-ummins (older models)
Buses, buses, Large construction machinery, loaders, bulldozers, generator sets
• Multiple cylinder counts: 6, 8, 12 cylinders
• Features:
High pressure, high torque, durable
Cheap maintenance, many spare parts
Inferior precision compared to VE, but more robust

2. VE Distributor Pump – Light-Duty, High-Speed, Small Cylinder Count
• Used in:
Light trucks, pickups: 4JB1, 493, Jiangling, Qingling, Foton
Mini excavators, forklifts, agricultural machinery
Mostly 4-cylinder engines
• Features:
Small size, light weight, low noise
High speed, smooth operation
High requirements for diesel fuel cleanliness