CAT 368-9171 High-Pressure Fuel Pump – Optimised Plunger Lift Profile with Reduced Drive Torque Fluctuation for C7/C9/C9.3 Common-Rail Systems
1. Product: 368-9171
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
In the high-pressure fuel pump, the camshaft's lobe profile determines not only the plunger's lift and timing but also the torque fluctuation imposed on the drive train. A cam profile with a steep rise creates a rapid acceleration of the plunger, generating a high peak torque that stresses the drive gears and the camshaft bearings. A more gradual rise reduces the peak torque but can reduce the pump's flow capacity at high speeds. The CAT 368-9171 achieves an optimal balance with a redesigned cam lobe profile that reduces the peak drive torque by 18% while maintaining the same plunger lift and flow rate. The result is a pump that places a lower peak load on the drive train, reducing the wear on the drive gears and the camshaft bearings, and extending the service life of these components.
Cam Profile Optimisation – The Science of Load Distribution
The 368-9171's cam lobe profile is engineered to distribute the plunger's acceleration more evenly over the lift cycle, reducing the peak torque without sacrificing the total flow. Key design features include:
Peak torque reduction: 18% vs. standard cam profile
Torque ripple: Reduced by 25%, providing a smoother drive load
Plunger lift profile: Optimised for even acceleration
Flow rate: Maintained at standard levels (55–75 L/h)
Drive gear life: Extended by 20% in bench tests
Flow Stability – The Foundation of Consistent Injection
The 368-9171 uses a cam-driven radial three-plunger design with plungers spaced at 120° intervals, providing overlapping pressure strokes that minimise the flow interruption between plunger events. The flow ripple is measured at 3.8% at full load-a 40% improvement over two-plunger designs. The pump's volumetric efficiency is rated at 91%, meaning that 91% of the theoretical displacement is delivered to the rail, with the remaining 9% accounted for by internal leakage and compressibility.