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Port fuel injected engines generally spray fuel early on the back of the hot intake valves before they open, which fully vaporizes the gasoline before it enters the cylinder.
Direct injection engines do not, of course, which I think (?) is why they produce soot. However, DI engines typically also get better fuel economy.
Gasoline vapor claims are unicorn material.
Last edited by Ecky; 06-12-2022 at 02:06 PM..
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