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Re: PolyQuad
There are many more benefits to this than only the ability to increase overlap, though increasing overlap is still a benefit. It is understood that wave tuning is used in filling the cylinders in nearly every NA engine. However, more overlap with correct exhaust tuning also enables a lower pressure in the cylinder, hence better cylinder filling. The main benefit of this design, however, is the swirl that is introduced into the cylinder, resulting in a better burn. Another benefit is the increased flow that comes along with the different sized valves.
This is not an modification that would simply be slapped on an otherwise stock engine and expected to make significantly more power(though it might make some). Rather it is one part of a more complex equation. Different cams, manifolds, and engine management tuning would obviously be needed to make the most of this approach. I believe it is silly to say that because that's not the way Subaru did it, it shouldn't be done. As we all know, OEM's ALWAYS leave a lot on the table. While Subaru did a great job designing the EG33, with it's 95% VE, they still designed a 230 HP engine. Anybody wanting to make much more power than this will need as many tricks up their sleeve as possible. And this, my friend, is a very neat trick! The results are right there in the article, and it would be silly to think that this approach would not be a benefit to anyone trying to make power. NA or FI, this design has potential. The simple fact that is is brought to us by Vizard should be enough to prove it is the real deal. This man has always been out in front of the rest with revolutionary ideas, and this is one more.
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