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Lynn, here is what the stromberg manual says on page 2: " due to the fact that the main metering system will not function at low engine speeds a separate idle system is incorporated to provide the proper fuel/air mixture ratio in the idle range. The system consists of an idle tube with the idle metering jet in the lower end of the tube and idle air bleed holes drilled in the side walls of the tube, an air bleed, and two orifices drilled in the throttle bore which act as idle discharge nozzles. Fuel for the idle system is drawn from the annular space around the base of the main discharge nozzle. The fuel then passes through the idle metering jet, mixes with the air from the idle air bleed and then flows to the idle discharge holes. The relative quantities of fuel flowing through the idle discharge orifices are dependent upon the position of the throttle valve. At very low idle, all of the fuel passes through the upper orifice, since the throttle valve covers the lower orifice; in this case the lower orifice acts as a further air bleed for the upper orifice. As the throttle opening increases, exposing the lower orifice, additional fuel passes through the opening. Since the idle mixture requirements vary with climatic conditions, a needle valve type mixture adjustment is provided to vary the orifice in the upper idle discharge hole. The idle system functions up to an engine speed of approximately 1000 rpm." So again, your idle mixture screw should not affect your cruise power and cruise fuel flow. Jan Z Fresno, CA ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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