Quote:
Originally Posted by CoupeSS
Okay, so everyone please explain to the dummy in the room (yes me) what this thing about a catch can is and what direct injection has to do with anything. You are talking over my head.
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In a Direct Injection (DI) Engine, the fuel is sprayed
directly into the cylinder itself. The reason that top-tier gas doesn't do anything for carbon/gunk buildup on these valves is because the fuel
never sprays across the valves. In Port Injection engines, however, this is a valid point.
An Oil Catch Can is a device that allows PCV gases to enter the catch can before feeding into the intake (and across the valves), allowing oil vapors to condense and collect in the can instead of down the ports, causing buildup.
With DI engines, the dirty vapors coming from the PCV system are leaving deposits on the valves, and there is no fuel being sprayed across the valves to keep them clean (fuel wash).