rusefi.com

Pierburg CWA400

The CWA400 is the next development stage of the very successful principle the CWA200 used.
(A brushless and fully canned motor for instance)
This pump is supplying more than double the hydraulic performance at nearly the same dimensions.
Suitable mainly for engine cooling in combustion engine vehicles.


Specifications:
Name: "Pierburg CWA400"
Operation voltage: 8-16 volts
Weight: approx. 2.15 kg
Current consumption: 35.5A (36.3A max.)/ (approx. 0.2mA in standby mode)
Nominal diff. pressure: 0.85 bar *
Flow rate: approx. 150l/min @ 0.85bar / 220l/min @ 0.55bar
Speed: approx. 5900 rpm
Temperature range: -40°C – 128°C (water) / -40°C – 140°C (ambient)
Protection: IP67
Part numbers:
Pierburg: 7.03665.66.0
BMW: 11517604027 / 11518625097 / 11518635089

Datasheet: 3D CAD files: PWM Info:
Technical drawing: Flow rate: Overview Know-how:
* Pump pressure is not the same as the system pressure.
Those pumps can of course be used in normal automotive cooling systems with system pressures
in the range of 0.8 to 1.2 bar for instance.
The pump pressure or differential pressure expresses the ´resistance´ of which the pump has to work against.
Tip: A mechanical thermostat is responsible for about half of that resistance. (in most cars)

the pump is designed for circulating liquid in the heat exchanger ... the speed is regulated by changing the air temperature

Random issue I have found is that having the Pump on a switched relay seems to cause issue's. I am going to wire it so that the Pump sees 12V at all times so that It properly goes into standby mode. What I am seeing is with it wired to IGN that after a while after startup and DC is set to less than 100% the pump shuts down. IDK why this is but just a observation and ill report back once I have more input on rewiring the pump.