I know such a paper exists. I had it before my hard drive crashed.
Water injection can be used to raise the compresion ratio. You just need to use enough water , control the amount tightly, and make sure all the water is expelled from the cylinder for the next cycle. After doing a more vigorous search I remembered it wasn't a NACA report. I think it was British and pre WWII(It could have been durring or just after). Since octane rating can and does vary from batch to batch, the purpose was to tune the compression ratio to run at the maximum the fuel would allow. The research paper used an actual aircraft engine to test it. It was a normally aspirated opposed four cylinder engine as I remeber it. I can't rember the percentage increace in power output they gained which is what I want to know.
It took water injection to the next level.
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