An engine with a very low part count, high power density, and flexibility to operate with a constant pressure burn for high efficiency is in the concept stage. It is optimizable for power, efficiency, and high power density; and is non-idling, self-starting, self-lubricating, and with regenerative braking. Fuel is introduced with the compression entering the combustion chamber. The amount and timing of the charge can be delivered in efficient pulses or in a nearly constant pressure mode for high power. Each sweep of a plate accomplishes two of the cycles. Three of the six plates exchange exhaust with fresh air as they sweep a chamber ahead of the power stroke. The other three drive plates expand combustion gases and compress the fresh air ahead of it into the central accumulator.
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