I don't know if it's maybe a bit too advanced for you (I'm studying automotive engineering) but the last couple of years have seen the development of what is called a variable compression rate engine or VCR engine.
You said that your project should have some impact on the world and with this technology it is possible to cut a considerable part off the fuel consumption of the internal combustion engine and gives you the possibility to put anything in there: gas, diesel, methanol, LPG.
It uses some kind of an auxiliary cylinder, it's a bit hard to explain. Maybe you could build some kind of model of how it works. A prototype using this is the Peugeot MCE-5.
You said that your project should have some impact on the world and with this technology it is possible to cut a considerable part off the fuel consumption of the internal combustion engine and gives you the possibility to put anything in there: gas, diesel, methanol, LPG.
It uses some kind of an auxiliary cylinder, it's a bit hard to explain. Maybe you could build some kind of model of how it works. A prototype using this is the Peugeot MCE-5.