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I've read many a story about people swearing on seafoam. I've used it, but have no opinion one way or the other. In my most recent research, I came across people very carefully adding water to their intake via airtube, or vacume hose. The theory being that the water cools the air and upon entering the combustion chamber turns to steam and removes carbon buildup, much like a steam cleaner. Has anyone tried this? Does anyone want to be a guinea pig? Haha.
Also somewhat related, How about water injection? Mostly used in turbo or supercharged engines. From what I read, it has its benefits even on NA engines. If nothing else, for the cleaning properties. Supposed to help eliminate ping as well.
That steam will have very low pressure, if any, it won't clean anything, but you could actually mess the engine good if enough water enters the chamber. I would say NO-NO.
One very simple FACT... air compresses. Water does NOT! Would you like to see what a half ounce of water in a cylinder will do to it? I'm sure there are more than a few mechanics who would be happy to show you.
The ONLY place where water injection ever worked with any noticeable gains was high-altitude aircraft engines where the added humidity (introduced as extremely fine vapor upstream of the carburetor) helped improve oxygen levels at altitudes where it was considerably lower than at sea-level.
You are better off with a damp rag in the bottom of the air filter box. Water needs to be introduced as humidity, not fluid, to be effective. Damp air loses temperature quickly especially if its moving. Everyone has heard the benefits of "cold air intake".