Half a croissant, on a plate, with a sign in front of it saying '50c'
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Positivly pressurised cylinder heads

 Increases momentum of energy transfered in the combustion phase
 
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Fill the inside of a cylinder head of any other component with an inert liquid or gas which when heated during combustion will expand causing a positive pressurising effect. This pressure will be exerted on the combusting gas which will increase the moment of energy or rather ruduce to enegy lost in the combustion process.
—SIVOLC, Jul 12 2004

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       Not sure what exactly you're trying to accomplish here, but whatever it is it doesn't seem to make sense. Using inflatible engine components will do nothing to increase the compression ratio.
—TerranFury, Jul 12 2004
   

       I think what SIVOLC means is that the expanding bellows would keep the compression ratio of the combusting gas constant. For example, if the volume of the combustion chamber is 20 cc at TDC and the area of the piston is 20 sc, then when the piston moves down 1 cm, then the volume of the gas has doubled. But if the heat adjustable bellows were to expand by 20 cc, then the compression of the gas would stay constant.   

       But I still have to fishy this idea. I think it would be very hard to find a material that is strong enough to withstand the extreme head and pressure of combustion but still flexible enough so that being cycled from inflated to deflated 1,500 times a minute would not cause it to fall apart. Also, there will be a lag as the fluid in this item heats up and cools down.
—GenYus, Jul 12 2004
   

       Question: if the compression of the gas stays constant, then where does the energy output come from? The gas needs to expand to do work. Or are you talking about moving the cylinder twice as fast downwards then? To do that, you'd probably need another combustion chamber inside the piston.
—RayfordSteele, Jul 12 2004
   

       Hot-rodders have for some time injected small amounts of water into the air intakes of their engines. The water turns to steam inside the cylinders. The steam generates "power" in two ways. First, indirectly by removing heat from the cylinder (heat leaves with the steam and exhaust gasses when the exhaust valve(s) open. Second, a cooler cylinder permits the burning of an increased amount of fuel/air mixture for more power without fear of "detonation" (uncontrolled fuel/air burning that can ruin an engine). So, when injecting water you can simultaneously add more fuel and air for more horsepower!   

       Water is used because it expands into a gas (steam) than does any other liquid, creating greater cylinder pressure.
—ricks, Sep 01 2004
   


 

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