I bought 10 of These

1slow370

nope no swirl. honda had swirl figured out years ago and the only real effective way to do it without to much turbulence is to have either one intake valve open farther than the other or to have one valve bigger than the other. all the intake swirl in the world isn't going to help the air get shoved down the runner. you need swirl inside the cylinder. there are various head designs in the 2 valve world that work to pull it off as well. so far as the direct injection goes that has all been figured out long ago as well it's called a diesel engine and it's been around forever. the shape of the piston head on a diesel engine (which is very similar to the shape of the head on a DI gas engine) allows a lean center flame due to the quench areas on the piston allowing as high as over 40:1 fuel ratios without burning up the pistons. Diesels actually make that black smoke and generate super high egt's (performance tuned ones watch a tractor pulling video or something) when operating at what they call near stoichiometric conditions which is a fancy way of saying 15/16:1. deisels always run lean or else there isn't enough air to cool the charge down and the super high cylinder temps melt/blow the engine apart. DI in a gas engine works the same way. it injects very little gas right before the spark to prevent detonation and relies on the shape of the piston to allow it to be able to burn such a small quantity of gasoline.

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