Bosch 0414693006 – The CP1 Pump With Controlled Flow Ripple For Reduced Combustion Noise

In a common-rail diesel engine, the high-pressure pump delivers fuel to the rail in pulses. Each pulse creates a pressure wave that travels through the rail, and the wave is transmitted to the injectors. The pressure wave creates a variation in the injection pressure-the pressure is higher at the start of the pulse and lower at the end. The variation creates a fluctuation in the injection quantity, and the fluctuation creates a combustion noise that is audible as a diesel knock. The 0414693006 is a Bosch CP1 pump that is designed with a controlled flow ripple that reduces the pressure variation-the pump's cam profile is shaped to deliver a fuel flow that is as constant as possible, and the flow ripple is reduced to less than 5 %. It is the pump that delivers a smooth fuel flow, so the combustion noise is reduced and the engine runs quietly.

 

The high-pressure pump delivers fuel to the rail in pulses-each plunger stroke creates a pulse of fuel. The pulses create pressure waves that travel through the rail, and the waves are transmitted to the injectors. The pressure at the injector varies with the phase of the wave-the pressure is higher at the peak of the wave and lower at the trough. The variation creates a fluctuation in the injection quantity-the quantity is higher at the peak and lower at the trough. The fluctuation creates a combustion noise that is audible as a diesel knock. The 0414693006 addresses this with a controlled flow ripple that reduces the pressure variation. The pump's cam profile is shaped to deliver a fuel flow that is as constant as possible-the cam lobe profile is calculated to provide a constant plunger velocity, and the velocity is maintained across the compression stroke.

The 0414693006 is a direct replacement for the original CP1 pump used in Bosch common-rail systems, commonly found in:

BMW – 3.0 diesel (M57, N57) – 3er, 5er, 7er, X5, X6

Volkswagen Group – 2.5 TDI, 3.0 TDI – Audi, VW, Seat, Skoda

Mercedes-Benz – OM612, OM647, OM648 – C-Class, E-Class, ML, Sprinter

Jeep – Grand Cherokee 3.0 CRD

Ford – Transit 2.4 TDCi

Land Rover – Discovery 3, Range Rover Sport – 2.7 TDV6

Jaguar – S-Type, XJ – 2.7 diesel

Peugeot – 607, 807 – 2.2 HDi

Citroën – C5, C8 – 2.2 HDi

Cross-references include Bosch 0414693006 and the original OEM pump used in the CP1 systems listed above. The pump is designed for the 12 V electrical system used in these engines.

The 0414693006 uses a cam profile that is shaped to provide a constant plunger velocity. The cam lobe profile is calculated using a mathematical model of the pump's dynamics-the profile is designed to provide a constant velocity across the compression stroke, and the velocity is maintained for 60 % of the stroke. The flow ripple is verified on each pump using a pressure transducer-the pressure ripple at the pump outlet is measured, and the pump is released if the ripple is less than 5 %.

Aftermarket pumps often use a cam profile that does not provide a constant velocity-the flow ripple is higher, and the combustion noise is increased. The genuine 0414693006 is manufactured with the constant velocity cam profile, ensuring that the flow ripple is reduced.

Q1: How can I tell if my flow ripple is high? → The engine has a diesel knock that is louder than usual.

Q2: Can I use a standard CP1 pump as a replacement? → A standard pump may not have the constant velocity cam profile.

Q3: Why does my engine have a loud diesel knock? → The flow ripple may be high-the pressure variation is creating a fluctuation in the injection quantity.

Q4: What is the most common cause of pump failure? → A worn cam lobe-the cam lobe wears, and the velocity profile changes.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel can affect the wear rate of the cam lobe.

Q6: What is the warranty on the pump? → The pump has a 12-month warranty.

 

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