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Brazilton KS | Used a thinwall conduit sweep, mitered the end, cut hole in cowl outside of the fan, put sweep through hole in between sections of the radiator core with the mitered end turned to enhance the low pressure in the sweep. Attached hose to sweep and to aspirator. With the engine at half throttle, there was enough suction on the hose to pick up the dirt off the shop floor...more then the muffler venturi would produce.
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MX 255 exhaust flapper valve
