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Hi,
An interesting variation on this was used in the Ducati SuperMono -- instead of using a fuel injector that sprays a mist; they used an injector that sprayed a single stream of gas, aimed right at the center top of the piston. The fuel hits the hot metal piston crown and vaporizes -- and it cools the top of the piston better than an oil mist on the backside.
The size of the piston/combustion chamber on this motorcycle required them to do this; and they ended up with a (counterbalanced) single cylinder engine that can rev up well over 10K RPM.
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