Radiator question

[polly]

Hi does anyone know how many radiators and their purpose are on the m5 . I am just curious and would also like to learn more about my car

Many thanks for inputs

[jmh]

There's a complete description of the S64TU available on BMWTIS which covers most of the info
(minus the transmission/steering/rear axle ones)
Last I counted the F10 M5 had ~18 radiators/cooling units

[polly]

found the answer

With an output of 412kW / 560 HP, the new BMW M5 has power to spare and offers excellent driving performance. However, this enormous output creates the same level of combustion heat in all high-performance engines. In the case of the Formula 1 engine, the coolers are housed in an exposed position in the side boxes – a different solution needs to be found in the case of a sports limousine. For the new BMW M5 we have developed a tailor-made cooling package that covers all our requirements to perfection. A total of 10 coolers ensure that the temperature is kept just right, while also supporting the spontaneous response of the V8 engine.

The principle of direct or indirect charged air cooling applied to turbocharged engines. Air-to-air heat exchangers are used in the case of direct turbocharged cooling, which would have required much longer paths to the front of the car for the charged air with a lot of dead volume in our case. That’s why we use an air-water heat exchanger placed between the compressor and the intake manifold for every turbo charger. The heat generated while compressing the air is fed to three water-air coolers in the front of the car by means of the medium of water. The charge air thus takes the shortest path with a large diameter from the compressor via the charge air cooler directly to the intake channel. This improves the engine response. We have an air-water cooler and a total of three water-air heat exchangers for each cylinder bank: one radiator in the wheel arch to the left and right and one in front of the main heat exchanger. This means that a total of five coolers with their own reservoir and 2 electrically powered water pumps are used to cool the charge air.

In addition, there is the radiator for the main cooling circuit (high temperature circuit), familiar from every car. In the classic configuration, additional coolers are provided for the engine and gearbox oil and the steering hydraulics. Finally there is the condenser for the air-conditioning system. That makes ten coolers in all.
The rear axle differential has an aluminium oil tray with cooling fins so that a separate radiator is not required there. A smaller offset in the differential reduces friction and therefore the build-up of heat. Less friction means less fuel consumption here too.


WOW

[Used2be]

Originally Posted by polly

found the answer
The rear axle differential has an aluminium oil tray with cooling fins so that a separate radiator is not required there. A smaller offset in the differential reduces friction and therefore the build-up of heat. Less friction means less fuel consumption here too.

Interesting, thanks. I wonder if the diff has its own cooler for racing applications?