The principle behind Bosch's new water-injection system is ingenious

Better performance, less fuel
by Drei Laurel | Sep 5, 2016

We're sure that many of you are familiar with the BMW M4 GTS and its 3.0-liter six-cylinder turbocharged mill. As we mentioned last year, the car's engine features a revolutionary water-injection system, which raises its performance to even greater heights. But how exactly does it work?

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Surprisingly, it's not that complicated.

Bosch claims that the water-injection system provides the M4 GTS with better efficiency, more power, less emissions and improved performance even at full load. According to the company, engineers make the most out of a car's engine based on the simple rule that engines must never be allowed to overheat.

To prevent overheating, an engine is injected with more fuel, which then evaporates and cools part of the engine block. With water injection, a mist of water is injected into the intake duct before the fuel ignites, providing a more effective method of cooling and allowing earlier ignition and more optimal combustion. This in turn reduces fuel consumption by up to 13% and gives the engine a little extra oomph without increasing displacement by making use of its "untapped potential."

And no, the water does not cause rusting inside the engine as it evaporates before combustion occurs. Only a little amount of distilled water is needed to run the system, which needs a refill only once in every 3,000km. To be more specifical, only a few hundred milliliters of water is needed every 100km.

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Will water injection make its way into other, less performance-oriented vehicles? Actually we think it's more of a "when" than an "if." We're definitely looking forward to finding out if this is as good as Bosch makes it out to be.



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PHOTO: Bosch Mobility Solutions
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