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Honda claims the two valve ISDI engine can match the VX lean burn engine in efficiency.
Valves are offset with two plugs per cylinder. Personally I am a fan of transonic combustion technology, which highly preheats the fuel which ignites without spark when injected at ultra high pressures directly into the combustion chamber. You may see a combination of the ISDI configuration with transonic injectors, which could possibly pass the 50% efficiency threshold, maybe even 60% after considerable refinement.
Better mixture distribution will eliminate NOX emissions as far as regulated amounts, possibly altogether.
regards
Mech
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