I figure that since they are effective enough to be used in Dyson vacuums and industrial particulate treatment alike, that they'd be an effective way to reduce pumping losses in Otto cycle engines. Are there any examples of this in the real world? And if there's an issue with maintaining flow characteristics over the various engine speeds, could it be solved with a variable geometry cone or flaps or something? Or even multiple stages of cyclonic cone filters that are designed to remove air particulates in different optimized engine speeds? In theory this could make a condition where an extremely thin, very high flow mesh filter could serve as the last barrier between particulates and the engine... or even more optimally, if the cyclonic filtration works well enough there could be virtually no need for a final high flow mesh filter. What do y'all think? Is this possible / feasible? I know some turbine engines, tanks, and small (Honda) engines have taken a step towards this, but merely feature the cyclonic prefilters to extend the service life of the main mesh filter. My hope is to have cyclonic filtration ONLY to reduce pumping losses. I'm guessing this could help with reducing emissions as theoretically it would put less parasitic load on the engine as well.