Bring on the water!

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Ironically, with water injection, BMW wants to reduce the fuel consumption of its turbocharged engines. What sounds like alchemy, works.


BMW/ Uwe Fischer

Tom Grünweg

Tom Grünweg

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Wednesday, 10.06.2015
At 14:45

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Finally, an additive, and is ecologically completely harmless and yet, something brings: BMW wants to equip its engines with a future water injection to reduce the fuel consumption and to increase the performance.

The idea is as simple as it is effective: “It’s about the combustion air to further cool down, as this is done with the intercoolers for the Turbos,” explains Frank van Meel, head of M GmbH. He now has the first prototype with this technology.

Where the Bayern bubbles, especially at high rotary water spray numbers in the collectors of the suction module. As the engine would have a built-in air conditioning, to evaporate this water steam immediately and thereby cool the air down before it flows into the cylinder. Up to 25 degrees Celsius with this technique make up for it, expect the engineers.

Eight Percent Fuel Savings

Thus, the temperature in the combustion chamber, and with it the risk of uncontrolled combustion (“Knocking”). Therefore, the electronics can increase the boost pressure of the Turbos and at the same time, an earlier ignition point. Both increases the power yield. In addition, fewer pollutants are released and on top of that, the load on the engine reduces, explain to the Bavaria.

The result of more boost pressure in the Turbo, which you can feel when Driving it immediately – even if the testing carrier is a bit extreme, or 0.2 bar. As installed, the Bayern have the water injection first, in the Safety car for the MotoGP, which is based on the series 431 HP strong M4 and in every respect has been radicalized. It is lighter, louder and more powerful.

BMW/ Uwe Fischer

BMW M4 Safety car MotoGP 2015 season: Here are the water injection in there

A minimum of 50 HP and as many Newton meters of torque, the Bayern tickling so once more out of the engine, says van Meel and raves from the shorter lap times. But the technique can be used not only to increase the performance: If one interprets the water injection alone for maximum efficiency, let the consumption to an average of eight percent. It is no wonder that the M GmbH also parent company BMW already has the first prototype run and, soon, with models of one – or two-row, to demonstrate what is in the water.

Was invented, the technology 50 years ago

So effective the water injection in the engine, there is little the customer needs it – to fill except occasionally the Tank, the BMW with the prototype, the short-hand in the spare wheel well in the trunk. In the race for the MotoGP of the five-litre fuel Tank is sufficient as long as the petrol. For the everyday on the motorway, van Meel reckons with significantly less water consumption: Only every fifth Refuel then re-distilled water should be refilled.

Unlike the SCR catalyst of the diesel engine and AdBlue injection, however, this is not compulsory. Where the electronics will turn off the diesel without the additive of law due to the faucet, continue such a Turbo without water in the Tank is quite normal. Just with less power. And also before frosty temperatures in the Winter, you do not need to fear, calms van Meel, the skeptics: Pre-funded all of the water out of the lines back into the water tank, so nothing can freeze Stopping the engine. The Tank itself is housed in frost-proof, promises BMW.

The new technology, is gives van Meel. Rather, it was worked already more than 50 years ago, and has been used in various racing cars up to formula 1. The most recently-built production model with water injection for the Saab 99 Turbo was produced until the mid-eighties. “Yet, somehow, the water injection is fallen into oblivion,” says the head of M GmbH, and may also explain, why it is only now that someone has reminded. “Because in times of Downsizing, this is more meaningful than ever. And Rocket Science it needs to implement.”

Not for nothing is van Meel want to have the water injection at least in a small series as quickly as possible on the road and expects to have a development time of one to two years. That it is not faster, is less the technology itself than to the components. “To authorize Tanks, pumps, and spray nozzles industrial, and that costs time. Unfortunately, we cannot apply the technique of the windshield washer system.”

How the water injection works in the company, shows the Animation in the following Video:



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