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post #3 of (permalink) Old 27th August 2007
Technical Supremo

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This idea was muted many years ago in the aircraft industry but the laws of thermo dynamics where the difficulty. All metals expand when heated and contract when cooled and the main problem with the standard 2 or 4 stroke engine is that its running temperatures are not equally distributed throughout the engine. In other words the top end of the engine is the hottest (combustion takes place in this region)and the low end is comparatively cooler beacuse not only is it farther away from the point of combustion but is closer to the oil supply which also cools. Without permitted movement (joints which allow expansion and contraction, e.g. the head gasket) in the upper areas the stresses would cause rapid failure. One other main difficulty would be in the casting of such engines wherby it would be extremely dificult to ensure the water cooling pathways where correctly situated.
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