The original point was this, vorices, that is, making air swirl or spin, only separates fuel and air. It happens in all gasoline engines, regardless of the purpose of the engine.
But adding swirl/turbulant/vortex "technology" to intakes and heads as a way of supposedly improving fuel and air mixing and therefore efficiency is classic snake oil in my book. Mixing fuel and air is important. It's just that swirling is not what you want if you want better mixing of fuel and air.
Personally I'd even question if your swirl heads even swirl more than stock heads. And if they do swirl more, then there's very little chance that they mix fuel and air more than stock heads. I mean, sure, I'd love to see someone with a test rig that similates wet flow with florecent, gasoline-like liquid and the camera and computer setup that can track how much of that liquid is staying suspended and/or evaporating into the air and how much if it is being flung onto the cylinder wall test your swirl heads and compare them to stock heads. But starting with the word swirl, I personally don't see much reason to believe in them.
But hey! If you think they work, maybe someday you'll prove me wrong. That's what experimenting is about. Don't take some random guy's word for it just because he posts some YouTube videos on a forum on the internet.
I still think the videos above are very relevant, educational and interesting. But admittedly they are a bit long, very unrefined, and are not intended to inform an ecomodder how to get better fuel mileage. And they are very anti-swirl. So there you have it, take or leave it, and best wishes with your build.
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