Thread: APT SmartCarb
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Old 10-14-2012, 06:24 PM
Corey Corey is offline
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Join Date: Jun 2011
Location: Laramie WY
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Phil, there’s no school like old school. You're right the similarities are many, however the distinction between the Lectron and the SmartCarb spans over 40 years of development and is the final design in the long line of Edmonston designed single circuit flat slide carburetors, including the Lake Injector, Pos a Fuel, Lectron, EI Blue Magnum, Quicksilver and AFT”.

The Lectron is widely recognized as a “drag race” carburetor because it works very well in applications where maximum power is desirable. Which it does well, what it does not do well is provide high signal to the metering rod throughout the whole range of throttle opening and therefore smooth throttling suffers, requiring many different venturi sizes (every 2mm) and has thus gained a reputation as not being very streetable. The reason: Throttle opening and closing is symmetrical in relation to the throttle bore area, which is more or less round. While there have been small improvements over the years with Lectrons, the SmartCarb has a patented variable venturi shape that concentrates and accelerates airflow past the base of the metering rod under all throttle opening positions. This shape provides an extremely high pickup signal to the metering rod in all conditions and is also specific to enhancing air/fuel flow balance in both two cycle and four cycle engines.

The SmartCarb automatically and immediately corrects air/fuel ratios for changes in air density and elevation. The operating principle between the SmartCarb altitude adjustment circuit and a dial a jet (what Lectron calls its Power Jet) is the same; static pressure in the venturi is directly communicated to the float bowl to adjust fuel driving pressures, and ideally fuel flow remains proportional to airflow. The difference is a dial a jet has only a limited number of manual settings and must be reset for large changes in barometric pressures and/or elevation. The dial a jet also has opportunity for flow reversion at very high speeds because it is directly exposed to the venturi via the signal tube. The SmartCarb vents the float bowl directly to a scoop isolated in the venturi away from any opportunity for flow reversion.

$299 will get you dated technology from 30 year old dies. $775.00 will get you state of the art 6061 billet construction, unbelievable atomization, instant throttle response, 30%+ gains in fuel economy, 10%+ gains in HP, 8%+ gains in torque and an emissions reduction.
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