If somebody tells you that adding a little bit of water to your engine can get you 40% better mileage, they're probably blowing a lot of hot air. If Bruce Crower, winner of the 2007 Popular Science Invention Award tells you it's possible, be prepared to be blown away.
In today's gasoline and diesel engines, the four strokes of the piston - intake of air, compression of the air/fuel mixture, combustion of fuel, and exhaust of the resulting fumes - generates temperatures above 1500°F. Crower's new engine design harnesses this otherwise wasted heat by injecting water onto the blazing hot piston. The water instantly vaporizes and expands in volume 1,600 times to power the piston through another two strokes. The resulting steam is then recaptured and fed through a condenser to be used again.
Not only does this increase the amount of power produced by the engine by about 40%, it cools the engine as it operates, completely eliminating the need for a cooling system. No radiator, no coolant, no water pump... it could shave as much as 1000 lbs off the weight of semi-truck engines.
Best of all, the technology could be used in any kind of internal combustion engine. Gasoline, hybrid, series hybrid, biodiesel, and it would always save huge amounts of fuel.
No word yet on when we might see this in passenger cars, but the designer's credentials and a working prototype mean it's not more than a few years off.
via Popular Science

written by giorgio, May 29, 2007
written by Tobias, May 29, 2007
written by Space, May 29, 2007
And how is it injected in the engine if there is no pump?
And isn't water being a coolant here?
This seems to be a cooling system that recycles some of the energy rather than just dissipate it entirely as heat.
written by CF, May 30, 2007
"And how is it injected in the engine if there is no pump?"
I think they mean no more water pump in the traditional sense. One that is belt driven to run the coolant system. But there would most likely be a pump for the water like there is a pump for the gas lines. Electric, not belt driven. If I had to guess I would assume that the water is injected similar to how fuel is injected. And that would lead me to assume that it's also fuel injected. No need for a carburetor when you are already injecting something. However, I can't tell if there is a carb or not in the linking article's pict.
"And isn't water being a coolant here?
This seems to be a cooling system that recycles some of the energy rather than just dissipate it entirely as heat. "
Essentially yes. Heat is energy, so why not try to harness it, even if it is a byproduct, and use as much as we can?
Also this isn't as radical as it might seem. Turbo Prob airplanes did this several decades ago. Although the water injection wasn't on it's own stroke, it was with the air fuel mixture.
written by dave, May 30, 2007
written by calahulabuddy, June 05, 2007
I had another idea in mind, but I believe this one will be the wave of the future, and running on green fuels.
Thanks
written by Dido, June 12, 2007
written by pumps, July 06, 2007
written by TERRY FRASER, July 18, 2007
written by wewantutopia, February 17, 2008
Why would you think that? A four stroke cycle has only 1 power stroke while this 6 stroke cycle has 2 power strokes. 1/4 or 2/6. I looks like the 6 stoke will create more power
written by Lyle Clark, May 06, 2008
written by mohamad, June 07, 2008
written by nt, August 27, 2008
written by jim sadler, October 23, 2008
However the US Navy has used a better idea with great success. They inject sea water right inside the exhaust manifolds on some engines. The expanding steam adds more boost to the turbochargers. The Navy gets the extra power without exposing the guts of the engine to water. Obviously lugging around a lot of water would not work well for cars.
written by Milander, October 25, 2008
written by John Wordsman, October 26, 2008
written by bitch, October 26, 2008
hot engine befor turning on water and off before stopping
written by Apostrophe, November 01, 2008
You get stress fractures. (not to mention possible corrosion)
This is not good for an engine.
It's possible that the piston won't get too hot, with water being introduced after every fuel detonation phase.. but it still doesn't sound like a good idea, to me.
written by Paul, November 02, 2008
written by Malcolm Harnden, November 09, 2008
written by deralaand, November 11, 2008
...and would this increase the fuel efficiency at all?
written by D's nuts, November 12, 2008
written by frank champagne, February 14, 2009
A better idea is to capture the now wasted heat from the exhaust and perhaps drive a modified flywheel equipped with turbine fins and a closed loop water/coolant system. This would be particularly effective on diesels.
written by Jed Reed, February 25, 2009
written by Jed Reed, February 25, 2009
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MAY 28
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