Quote:
Originally Posted by nimblemotors
My thoughts are to use water injection along with raising the compression ratio to a much higher value. This would normally cause detonation, but the water injection would prevent it. And also as you said, using a custom EFI system, you could run a very lean mixture at cruise speed and use the water injection to prevent overheating of the cylinders.
I think the downside (besides the added complexity for probably a small gain), is having to add the weight of the water and/or refill it often.
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I found one paper on using water injection to up the compression ratio in the past and have never been able to find it again. The critical thing to making this work is ensuring all the water gets out of the cylinder between cycles(not all of it turned to steam). Water in the oil was another problem. I remember in the paper they used a flat 6 cylinder engine and had the exhaust valves on the lower side which helped in solving the evacuation of water problem.