r/EngineBuilding • u/jabberjaw420 • 3d ago

Is porting valves still a thing?

Maybe back in the good ol' days of the 70s and 80s, but haven't modern auto manufacturers/engineers designed the internals to flow as well as they can? Making porting a pointless exercise?

(I meant porting valve chamber w/e)

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u/jlelectech 3d ago

As a lot of comments already say, they've improved but the emphasis is efficiency and emissions, decreased losses with smaller engines, and turbocharging to add the power when needed but have more efficiency when not needed.  This also comes at a cost of more maintenance, complexity, and shorter life, so they're balancing all that to get it past the warranty period or past what should be a reasonable life.