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Originally Posted by minibeel
Interesting idea. My question would be, if this makes a measurable difference, why have auto manufacturers not caught on? Maybe too difficult to mass produce heads with this feature...
dan
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It could be that this modification won't make much of a difference unless you're running a lot of boost or have made other significant engine modifications.
As you pointed out, engineers don't leave a lot on the table when they're designing engines, which is why things like capacitor-equipped spark plug wires, higher-voltage coils, and intake "vortex" devices don't show much of a benefit on stock engines. If devices like this produced significant gains in stock engines without unacceptable tradeoffs (e.g. noise, pollution, longevity), they would have been included in the design in the first place.
