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- Posted: Fri, 28 Sep 2012 04:10:28 +0000
Just adding to what I said >.>
Anyways, the oval shape would be make the swirl a bit violent I'd say, this is one of thos situations where air is a fluid, think about what swirling an oval while pouring water on on it vs a circle, way to violent of a flow
I think a half-circle would be even more violent... because then you have a 180-degree angle slashing at the air... That's a no-no...
I'll stick with my circles rofl In all honesty, there is no situation where an engine would ever really NEED non-symmetrical valves. It's kind of one of those things in engines that just happened to "work out" really well. Redesigning a valve shape to allow for more surface area would be problematic in most designs. If the heads were so small that simply making a bigger circular valve would be insufficient, and you needed a half-circle valve, then that would logically mean that you've already exhausted your other, more conventional options (bigger heads, bigger ports, bigger manifolds, etc.), and unless you're working on an extremely undersquare design, the flowrate you're trying to mold the engine towards would out of the range of the engine's air-flow capabilities, and the optimum airflow rate would be out of the engine's maximum rev range and displacement.
It just worked out... Maybe your idea would work out well if we were talking about a top-fuel dragster with a supercharger the size of a boulder and required an optimum flow-rate of such a ridiculously large number, that MAYBE your valve idea would become tangible; but then you'd burn your fancy shmancy valves after one run...
Also, I'm not really adding on to what youre saying; valves dont rotate to promote airflow. They rotate because they naturally do; there is nothing to stop them from rotating and there are slightly centrifugal forces acting on them making them turn. They do promote fuel atomization flow. A perfect example would be the Wankel rotary. Notorious for unburned fuel (bad atomization), yet they have wonderful airflow characteristics (yet no valves?)
no one said my valves had to last, just, would it work xD
I think it would, call it a race set up
Hell something similar to a single butterfly valve would work as well..... but not for very long, nor would it be efficient
But if you want a nice display piece, it'd look pretty badass on a shelf