I have seen this announcement:
http://newatlas.com/bosch-water-injection/45205/?li_source=LI&li_medium=default-widget

Bosch is a very serious company, so it may become real.

Philippe CHENEVIER

The government will figure out how to tax water used in engines.
Otherwise there will be a huge loss in tax revenue to the government:-)

Right now the gasoline tax in Europe is right around $5 a gallon.
Then there is the question of an increase in humidity with all that steam
coming out of  exhaust pipes  :-)

The water will have to be filtered as other wise it will leave deposits
in the engine and in the water tanks.  Filtered drinking water cost $1.28 a
gallon in the US grocery stores. About one dollar a gallon  cheaper than
gasoline in the US including the gasoline tax. The cost of filtered water
is about the same as untaxed gasoline. Gas taxes run roughly about
a dollar a gallon in the US.

In California we have a water shortage so the price of food will go up
as the farmers use 80% of the total water supply :-)

Paul Lamar

Paul, Thanks  for the link to the Bosh article.  Their approach is
following  something similar to my experiment on the Wankel engine. I
plan to alternate the injection of fuel and water on alternate faces of
the rotor.  The engine alternates between a Carnot and Rankine cycle.
The fuel consumption should start with a 50% reduction in fuel consumed
and a small reduction  in power on the Rankine cycle face. ie a large
improvement in specific fuel consumption.  Status of the project is:
Sach engine in place , Maximite in place.  re-learning basic from 40
years ago.  I am quite impressed with the Maximite.

Ken Burdges

I just bought a full size bed size air mattress from Walmart  for $40.
It came with a great little
electric air pump  that runs off 4.5 volts at 2 amps. The brand is
Intext made in China of course.

A sleep number bed is an air mattress with an air pump and it sells for
over $1000.
All I need is a $10 pressure sensor and a Maximite and I have a new
Sleep Number bed :-)

Paul Lamar

IF :

The main benefit of water injection lies in lowering combustion temperatures within the engine.  Adding water to the air/fuel mixture lifts those boundaries by actively lowering the temperature within the combustion chamber, allowing a higher compression ratio without the risk of knock.

According to Bosch, running a higher compression ratio makes for improved performance and around 4 percent less CO2 under test conditions. In the real world, the company says fuel savings could be up to 13 percent.

....the water injection system is reasonably simple in its operation. Water is drawn from a small tank, and a fine mist is sprayed directly into the intake port, where it evaporates. Bosch says 5 liters (1.32 gal) of demineralized water is enough to last around 3000 km (1864 mi) of regular driving, and when it runs dry the car will carry on operating as normal.

Water injection isn't just about efficiency, there are also performance benefits. The BMW M4 GTS got a 59 kW (80 hp) power boost over the conventional M4, some of which came thanks to the water-injection system. Bosch says manufacturers can expect a 5 percent boost in horsepower without any increase in displacement.

AND: the rotary has high temps and lower compression to avoid knocks, why not increase the compression ratio, add water and get a performance boost.......what's not to like about that?  Can we partially fill the bath tub of the rotor to up the compression and have a even better engine?  What say yea,

Guru Paul?

What are the gottchas?


Jim Brewer

I don't see any drawbacks for piston engines except the increase cost and
bother of keeping the water tank full.

The current Mazda geometry is about as high as one can go as far as compression
ratio is concerned. It is a matter of having enough volume in the combustion chamber
 to keep the fire going. The geometry would have to be changed to get a higher
compression ratio. I suspect compression ratio effect has a smaller influence in the rotary.

It is a matter of keeping the heat in the combustion chamber.
More progress could be made with materials with a lower
coefficient  of heat transfer. For example a stainless steel rotor.

Turbo charged is another matter and then it could help.
We are doing that already on the 650 HP time to climb engine.

Paul Lamar


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