I suppose that the conditions could be replicated in a test stand, simply mount up the engine, protect the intake and lightly hose down the running engine.

Do the same again but add a misting spray of water towards the intake (if you dare!)

My bet is that it is the water on the interior rather than the exterior that has the greatest effect here as it would expand rapidly into steam and effect the firing long before any cooling effect from the outside would be felt.

My opinion would be that a diesel would suffer before a glow if water droplets were added the fuel mix but I ain't about to try and find out!

Cheers.