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June 14, 2012


Julio R

Regarding Nubia's commment:
Assuming the following reason why vapor might increase efficiency. My closest guess would be because it is due to a better expansion of the fluid under the same temperature conditions. SO it is possible to increase the efficiency by using a fluid that expands better under a temperature change. BUT the reason I believe we have not seen this technology is based on the following data:
Gasoline Ignition Temperature: 280 C
Pressure Inside Cylinder: <6895 kPa
Critical Point of water: <374 C at 22000 kpa

So in this scenario we are well under the critical point of water and when the maximum pressure inside the cylinder (in load)is reached the boiling point of water is around 285 C or greater which the car is not working at. In this condition it is possible to generate water (liquid) inside the engine.
This will eventually cause pitting in the cylinder walls and literally etch the wall. This system even if it worked, it will require servicing the engine every few thousand miles.


Creating new sources of renewable energy is very important because we already know the future extinction of oil and possible damage to the ecosystem. GM is concerning about global warming, renewable energy and savings. Materials science and Engineering it is a good subject to find answers to these questions.


Good to know that GM is looking forward to transform the automotive industry. Regarding automotive fuels, GM has many patents (e.g. 3645244, 3963012, 3977378, 4458655) on fuel systems that results in higher mileage per gallon. During the '70s a vapor fuel system was developed giving around 100 miles per gallon (patented in 1979, No. 4177779, from El Paso, TX). This is old technology that we should be seeing now, but surprisingly that is not the case. Why is it that we don't see these amazing cars on the streets? Should we continue looking for alternative sources of energy or working in doing more efficient the current ones if we are not implementing them?

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