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BMW to bring Water injection to production?

Bruce Nunnally

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Water injection is spraying water into the incoming air or fuel-air mixture, or directly into the cylinder, in order to cool certain parts of the induction system where "hot points" could produce premature ignition (ref wikipedia).

Often in street car systems a mix of methanol and water is used, sometimes in the form of window washer fluid, because methanol complements the fuel air mixture as well as provides a cooling effect.

The process is said to yield a number of positive effects. For one, it reduces knocking. For another, it can make more out of lower-octane fuel where higher octane isn't available. It also can control the adverse effects of higher ambient temperature on the combustion process. But most of all, it increases output and reduce fuel consumption by around eight percent.

BMW is using a system on an upcoming pace car; Autoblog is suggesting they are proving it out for a future production application.

Read more: http://www.autoblog.com/2015/02/13/bmw-reveals-m4-safety-car-with-innovating-water-injection-system/


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Water could be and was used during takeoff on various multi engine (radial engines) bombers in Europe and the Pacific during "the big one".

When the aircraft was really heavy, the temperature high, the runway short,.... well you get the picture.

Interesting that water injection is being considered in these days of turbo/supercharger boosting.

In 1962 and early 1963 the Air Force used KB50's for inflight refueling... they had four R-4360's which is a 28 cylinder radial engine with 7 magnetos and 56 spark plugs.

It was equipped with ADI...

Normal power was 3500 HP at 55 inches of boost, but with ADI and 63 inches of boost on takeoff, power was 3750 HP.

There was another version that put out 4300 HP


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