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It appears all the VCR solutions I've read involve varying the combustion chamber volume by applying a force normal to a flat structure parallel to the piston head which necessitates the use of very high pressure specification, high force actuators. On the other hand a sliding profiled plate that slides parallel to the combustion pressure forces would require a far lower specification actuator. Remember the volume of the combustion chamber does not have to vary by much to have a large effect on compression ratio. The displacement profile of the slider plate would be optimized such as to preserve symmetry and avoid pockets of uneven combustion. Optimizing the profile for the part load condition would be the priority as that is where the majority of the engine operation time would be spent. I hope this technology becomes mainstream soon as it would enable an optimum use of E85 which needs a high compression ratio to get the most out of it.
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