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At 10:43 PM 4/5/2005, [EMAIL PROTECTED] wrote: >A mechanic who recently flew my 415D with a C85 engine, told me I needed >the carb rebuilt because when the mixture control was pulled out all the >way, it does not kill the engine. Is he the one whose going to overhaul it? Does he guaranty it'll fix the "problem"? Let him have at it! (Just kidding). As previously mentioned, the Stromberg mixture control is a back suction type. When working properly it will kill the engine at cruise power levels but not at idle. The root reason is that the suction is generated by the pressure drop in the carburetor venturi. Pulling the mixture control vents more of that suction to the float chamber. As the pressure in the float bowl approaches that in the venturi, the motive force to move fuel through the metering tube disappears and the mixture leans out. At idle there is no pressure drop in the venturi to speak of, hence no back suction and no leaning. You can kill the engine by pulling the mixture out then opening the throttle smartly, good for when a p-lead falls off, but not much use otherwise. John Cooper President, Save the Strombergs Society Skyport Services PO Box 249 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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