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Existing internal combustion engines are already designed to meet some of the issues raised in the first two comments, as the primary byproducts of hydrocarbon combustion are CO2 and water vapor. Specifically, regulation of water injection volume and timing, to control cylinder temperature and pressure can easily be used to directly limit blow-by, oil contamination and fuel vaporization issues.

Use Hydrogen as the fuel and the CO2 contamination issues go away.

Materials Research Required

: "Before this engine can go into mass production, there needs to be quite a bit of research into the materials properties. Some metals, when heated, will scavenge Oxygen from water, causing them to 'rust', decreasing efficiency, and spewing Hydrogen into the exhaust stream (e.g. Steam explosion). This is one of the reasons that most engines intentionally run with a rich fuel mixture (with the other reason being to hold down combustion temperatures, which tend to peak when running at a stochiometric ratio). Another concern may be with the water absorbing Carbon Dioxide to form Carbonic Acid. That probably won't be a problem for the exhaust system, but may be a concern with blow-by gasses. For that matter, with the cooler running engine, steam blowby into the crankcase may contaminate the oil, leading to premature bearing failure without some materials research into a water compatible lubricating oil. For that matter, the cooler running engine will require modification to the lubricating system (e.g., different viscosity of the oil, etc.)." (Dave Ref.)

Oil Emulsification Decreased Fuel Vaporization

: "Two obvious problems I see with this are: 1) Oil emuilsification.[...] I would think that within a very short service life the oil in the sump would be very badly emulsified, and this in turn would lead to accelerated engine wear 2) Poor fuel efficiency! [...Engines] rely in part on the internal heat to vapourise the fuel as it travels through the inlet mainfold tracts and into the combustion chamber." (Philber ref)

No Real Problems Here

Existing internal combustion engines are already designed to meet some of the issues raised in the first two comments, as the primary byproducts of hydrocarbon combustion are CO2 and water vapor coupled with very high peak cylinder pressures. Regulation of water injection volume and timing, to control cylinder temperature and pressure can easily be used to directly limit blow-by, oil contamination and fuel vaporization issues while maximizing energy recovery. Use Hydrogen as the fuel and the CO2 contamination issue goes away.

See also

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