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Post by Scoutpilot on Jan 9, 2015 10:17:00 GMT -5
The high-speed circuit begins to operate at about 20 mph. At this point, the velocity of air passing through the venturi of the carburetor reduces the pressure at the main nozzle and fuel begins to flow through the metering rod orifice. It continues past the metering rod and out the main nozzle where it mixes with the air flowing through the venturi. The correct amount of fuel required by the amount of air flowing through the throat is controlled by the taper of the metering rod.
The metering rod is inside the metering rod orifice and tapered so as the throttle is opened wider more fuel passes through. At wide-open throttle (WOT) only the small tip of the metering rod is inside the metering rod orifice. The setting of the Metering Rod in the Metering Rod Jet will affect the timing of the flow. Wear of both will increase the amount of fuel flowing sooner.
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Post by Scoutpilot on Jan 17, 2015 7:28:30 GMT -5
As part of an ongoing learning strategy, I offer the following video.
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