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oh by the way, most of other engines with water injection system inject water before ignition. To me, this is a real waste.
Instead, i have my exhaust valve timing strategy to control the effective compression ratio and the amount of exhaust heat to be trapped. At low or high load, i always have the optimum temperature for fuel autoignition.
Another thing, injecting water before auto ignition will disrupt the flame development. It's better that we wait until the chamber is optimally hot before we inject the water.
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