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I currently have a simple wire screen over my throttle body. Intake air is drawn from the high-pressure cooling air in the engine plenum. However I recently read that a straight intake pipe which draws air without the benefit of ram pressure is inefficient. Some air gets drawn in from the sides and has to make a sharp 90-degree bend. This results in a ring of low pressure air which "chokes" the intake somewhat.
Hot rodders have long understood the benefit of smoothing the intake air using a bellmouth inlet (sometimes called a velocity stack). Bellmouths are also installed on jet engines when they are run in a test stand (see attached photo).
So my question is, can someone point me to any drawings or papers which spell out the optimum shape for a bellmouth? Just has we have specifications for NACA scoops and airfoils I imagine someone did the research for air intakes.
Once I have a CAD drawing on hand, this seems like a good candidate for 3-D printing.
Thanks,
Adam Molny
Legacy N181AM, 295hrs
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