Lectron Pro-Series vs. Competition
The PRO-SERIES continues to build on our existing metering rod technology by giving precision fuel delivery across a wide range of conditions and adding the flexibility to optimize and adapt to what your engine needs. The Pro series introduces the new Torque Jet feature while continuing to utilize the metering rod and power jet circuits that results in a control over fuel delivery that has been referenced to “near EFI mapping capabilities”. The Pro series takes the positives of both traditional jetted carburetors and metering rod carburetors to combine and improve upon them. That flexibility, combined with control of fuel atomization from metering rod technology and the Pro-Series air flow capabilites, work together to get the most power out of your engine with no flat spots or compromises. Let’s look a little deeper into the history of the metering rod to explain this advancement.
Pro-Series Fuel Delivery
Traditional Carburetion
Traditional carburetors use multiple circuits, or jets, to deliver fuel to the engine. These jets are only effective over certain parts of the throttle range with a small amount of overlap. Most current two stroke carburetors use three circuits to provide adequate fueling, with an acceptable amount of compromise where the circuits overlap, as shown on the graph below. Even with three or more circuits the compromise introduced by having individual circuits leads to rich and lean spots depending on what RPM and throttle position you’re riding at. This causes flat spots followed by surges of power that make the bike “hit” and can give a false sense of the power being delivered. If you’re familiar with riding two strokes and four stroke fuel injected bikes, this is part of what gives two strokes their reputation for being ‘technical’ to ride. Utilizing technical skills and clutch management to keep two stroke RPM’s high in low throttle maneuvers, so you can maintain power availability when needed. Otherwise, the two-stroke will fall out of the powerband vs four stroke fuel injection that gives a much more responsive and available power, making it easier to always put power to the ground. The Pro-Series has received consistent feedback from pro class riders making comparison of the Pro-Series power and response to a four-stroke fuel injected bike. Get rid of bogs, no flat spots, and put big power to the ground. No amount of jetting will be able to fully eliminate this, you will always have to compromise somewhere.
The Original Lectron
The concept behind the original Lectron was revolutionary in 1974. Using the metering rod as its only fuel circuit, the metering rod creates a low-pressure fuel signal that is operated from the engines vacuum. Think of this as a rock in the middle of a river and as water flows around the rock, it creates a whirlpool on the other side. As elevation and air conditions change, the properties of the low-pressure pocket also change and ultimately will control the fuel within the ‘low-pressure’ pocket. This is how Lectrons adapt to elevation and don’t need to be constantly jetted. This worked excellently in Lectron’s early years with drag racing applications, but it was identified that metering rod technology also has its barriers. The metering rod technology has a linear sloped grind and thus the way it delivers fuel is also linear. For drag racing applications this was not a problem as you are only tuning for top end fuel delivery, however, with different riding applications, vehicles, and throttle positions, it was impossible to match a linear sloped metering rod to a bikes non-linear need for fuel.
The linear slope of the rod and the starting point of the rod can be changed to match different engine’s requirements, as long as those requirements are linear. When adjusting the metering rod rich or lean, you can only move vertically within fuel delivery (see graph below). The limitation a single fuel circuit metering rod-based carb is lack of adjustability for nonlinear fuel delivery curves, which is why we introduced the “adjustable power-jet” for mid-top end fuel adjustment. In the real world, engines do not have a linear demand for fuel, which introduces another level of compromise. The amount of air flow an engine flows varies with both throttle position and RPM and the carburetor must be able to respond to this changing demand. In theory, perfect fuel delivery will follow in direct proportion to air flow at a specific ratio to achieve ideal combustion and peak performance. As you can see in the example below, a three-circuit traditional carb will waver around the fuel requirement and a metering rod will be rich at idle and WOT or lean in the midrange.
Lectron's Power - Jet Advancement
With the addition of an adjustable power jet, Lectron is able to match these fueling requirements more accurately than a traditional carb. Since our power-jet is supplemental, there are no dips in the fuel curve. This allows us to fill in any fuel demand starting at half throttle, while still giving strong but smooth power. However, until now, there was still a small compromise before the power jet activated.
Lectron Pro-Series
The PRO-SERIES has created a class of its own in performance products by introducing the Torque-Jet (activates just off idle) & Immediate Response fuel channels. The Torque-Jet has been the last piece of the puzzle in offering infinite fuel adjustability to match any bikes fueling demands. Additionally, it offers the flexibility to personalize your throttle response to suit your liking. A quarter turn either way can drastically make your bike mild or wild, and it’s as easily accessible as tweaking your idle. The fuel channels are internally routed and designed to constantly retain and hold fuel to always be available at the Torque Jet and Power Jet. This feature results in no lag of fuel delivery and gives an immediate responsive throttle. Pair this with optional TPS to enable 3d ignition mapping and you have the most advanced and adaptable carb on the market.
