Bill - I think you're right on the tests needed with and without the resonators. And, don't feel bad about finding that article a difficult read - part of the reason you did is that the guy can't write! He uses words without regard to their meaning so that several sentences are nonsensical. However, I suspect his math is valid for the systems he's studied (which does not match our trucks).
As I said somewhere near the beginning of this thread, fluid flow (air in the duct acts like an fluid) is a very complex, and poorly understood process. I say it's poorly understood because the mathematical models make too many assumptions that allow it to be studied, but that do not allow a precise prediction of the outcome (there's always a bit of error between the predicted results and the actual observed results).
I was concerned about the possible bad effects of turbulence in the duct and it would be very easy I think to create a sort of "standing wave" that would interfere with movement of the air mass into the engine. I would still like to have a smoothly "curved" snorkel section that would turn to match the angle of the intake tube more smoothly than what I have right now. I think the sharp angle I have at the bellows can create problems.
The article seems to say that the resonators act to reduce the effects of turbulence and standing waves.
But, in our case, the resonators were designed for the original duct with the factory snorkel. I honestly have no idea if they are beneficial with the larger intake opening or are actually harmful. However, I felt leaving them on was more prudent than removing them. It also allowed me to return the setup to stock if I chose.
I can only report that the truck seems to run well at WOT and I've noticed no loss in power or adverse effects on gas mileage. Other people seem to say the same for their mods with the resonators removed.
So, the effects of the resonators are probably not enormously significant. (And, sorry if I got "geeky" too)! :o
- Jack
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Tue, April 21st, 2009, 10:10 AM
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