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Jetless Carburetor (smart Carb) By Lectron Fuel Systems.

Discussion in 'Modification' started by aydy, Sep 29, 2018.

  1. aydy

    aydy New Member

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    These smart carbs don't have any jets and doesn't have to be adjusted to elevation changes, It is simply plug and play. The needle jet is of a patented design.

    I have been on the fence of changing my carb and I'm thinking of switching to this. Here's the official specification details from LECTRON Fuel Systems.

    Smart Jetless Carburetor by LECTRON Fuel Systems.

    The primary obstacles to getting maximum airflow into an engine are the carburetor, intake manifold and port. We will deal here with the air/fuel charge and how the Lectron Carburetor can enhance this.

    In an engine a rapid repeating sequence of controlled explosions in the combustion chamber creates the power. The carburetor must mix the air and fuel in the correct proportions to obtain an optimum air to fuel ratio. The carburetor creates this air/fuel ration by responding to the vacuum created inside the manifold of the engine.

    The design of the Lectron® is focused on two primary principles:

    1. “AMPLIFY” the fuel pick up signal.

    2. “UTILIZE” the amplified fuel pick-up signal to create a more efficient burnable mixture.

    The bore of the Lectron® carb is not straight, but incorporates a taper to increase the air velocity. Maximum air velocity is obtained at the point where the patented metering rod vaporizes the fuel with the passing air. The bore then increases to allow the vaporized air/fuel mixture to flow freely to the engine intake ports.

    The Patented Metering Rod

    The metering rod, which vaporizes the fuel, is located behind the air cut-off slide; therefore it is directly exposed to the manifold pressure of the engine. In most other carburetors the needle is in the center of a round slide or on the end of a flat slide, therefore keeping it out of the manifold pressure.

    The increased air velocity in the venturi aids in creating a stronger fuel pick up signal at the fuel-metering rod. The air flow moves more rapidly past the needle in this taper bore design, more so than in a conventional straight bore carburetor.

    The metering rod serves three important functions:

    1. 1. A fuel signal generating device.

    2. 2. A fuel delivery metering device.

    3. 3. An air volume density sensor.

    Fuel Signal Generating Device

    The shape of the metering needle in itself is a fuel signal-generating device. The flat side of the needle in a High Velocity Chamber, enhances the fuel pick up signal. The metering rod accomplishes this by creating divergence. This divergence is similar to the low-pressure area created by an air craft wing, which utilizes low pressure to create lift. The Lectron carburetor uses divergence to create “Fuel-Lift”.

    Fuel Delivery Metering Device

    The shape and contour of the ground surface of the metering rod controls how much fuel is allowed to be drawn up in response to the extremely strong fuel pick-up signal. The various numbers of the metering rod relate to the depth of the grind at various throttle positions. The depth of the grind determines the amount of fuel delivered.

    The metering rod is one smooth continuous profile that eliminates “Flat Spots” often found on conventional carburetors with multiple overlapping fuel circuits. The metering rod does not contain transitions from idle to mid-range and wide-open power, but rather provides for a smooth consistent throttle response.

    The fuel pick-up signal at the base of the metering rod is twice as strong as found on conventional carburetors. This extremely high fuel pick up signal relates to instantaneous acceleration, created by a fuel surge when the throttle is snapped open.

    The shape of the metering rod compliments and enhances the fuel vaporization process by carrying the fuel signal and fuel vapors all the way up the length of the metering rod. In this manner fuel vapors are spread over the entire distance of the carburetor bore. The contoured side of the metering rod creates a fuel vacuum “wick” whereby the fuel vapors diverge from the metering rod starting at the base and continuing to the top of the rod. This allows a more efficient burnable mix to be created with all the air entering the intake manifold.

    The contoured side of the metering rod creates an extremely low-pressure area at this point, which results in the fuel being broken down into a very fine vapor. Most other carburetors lack such a device to create this. These extremely fine vapors are easily dispersed up through the bore of the carb. The finer the vapor the more efficient the burnable mix. A more efficient burnable mix will result in more horsepower and better fuel economy.

    Air Volume (Density) Sensor

    The combined affect of the metering rod acting as a fuel signal generating device and a fuel delivery metering device allows the metering rod to also act as an air volume (density) sensor.

    The ability of the metering rod to “sense” the air volume and density of the air flowing past it enables the metering rod to mix the proper amount of fuel with the air at a wider range of temperatures and elevations.

    Both air temperature and elevation affect airflow volume by weight. As temperatures decrease air becomes more dense and heavier. The denser, heavier air will pick up more fuel when passing the metering rod due to the signal generated at the rod and the shape of the rod. Conversely, as elevation increases less dense or thinner, the lighter air will automatically pick up less fuel by weight while still maintaining the optimum air/fuel ratio.

    THE SIMPLICITY

    The beauty of the Lectron Fuel Management System is its ability to “read” the fuel requirements based on air flow volume (density) and temperature to automatically provide the proper fuel/air mixture.

    Naturally there are limitations with any designed metering system. The Lectron carbs are able to operate in a much wider range of applications, temperature, and elevation due to their fuel vaporization efficiencies. Changes to operate beyond the wide range are simple and easy to make with a screwdriver and adjusting the metering rod. Changes do not require the removal of the float bowl. Depending on access to the carbs, the carbs do not have to be removed from the engine. All adjustments are made from the top side of the carb.


    Thank you for taking the time to understand the Lectron carburetor.


    Kevin Gilham

    Lectron Fuel Systems



    Additional Videos & Reviews (Sorry, Couldn't get it formatted as hyperlink)

    www.youtube.com/watch?v=NXDRfHH4k5M

    www.youtube.com/watch?v=r0Ktticu2BU
    www.youtube.com/watch?v=sEOwE8szdKM
    www.youtube.com/watch?v=RPFouteVWcY

    Lectron-Carburetor-2017-KTM-Husqvarna-1.jpg maxresdefault.jpg s-l640.jpg
     
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  3. SilverTooth

    SilverTooth New Member

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    How about putting high flow airfilter on it? and what would be the price. Thanks
     
  4. aydy

    aydy New Member

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    Yes it would work.

    The powerjet is used to adjust for high RPMS (mostly doesn't need to be adjusted / but it is there to give you the option to fine tune it)
    Then there is Idle screw, you might to want to adjust this in 1/4 turns to get the correct idle.

    All in all you can do big bore / big heads / high cams/ low cams / pod filter / stock airbox / velocity stack and you wouldn't have to do anything except adjust the idle only.
    there is no main jet or pilot jet in this carb and what you see as needle jet is not really a needle jet but a metering rod (one side is flat and the other is round)
    the round side is going to face the intake side and flat side will be facing the engine side.

    the science behind this carb is as simple as you placing a rock on a river that has current flowing and the water flowing around the rock and coming back behind it swirling.
    that's why the round side faces the intake side so that the AF Mixture will hit the metering rod and flow better behind the flat side before entering combustion chamber.

    Price is from $400.00 - $900.00
    I'm currently contacting one of the distributors.
    He said price varies from Sizing to the mode of use and body size (because they machine according to our requirements)
    most of them are made to order.
    there are some carbs mostly made for Huskys and KTM dirtbikes (mostly 2strokes).
     
  5. SilverTooth

    SilverTooth New Member

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    I dont think it would click in the market...but i rate this carb with 5 stars, sadly too much expensive just for a carb only...the price range can buy such big bores, cams, VS , head and rcdi,..etc...
     
  6. aydy

    aydy New Member

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    Yeah, it's mostly for people who ride long trails with huge elevation changes and mostly for dirtbikes. There are some bikes no matter how much you rejet you won't be able to tune it, this would suit those kind of application where you encounter a bike which is a pain in the ass to rejet.
    some people say it has better fuel consumption compared to other carbs.
    this is not something you would want to compete against something like the Keihin FCRs. (if you are into performance tuning)

    Some guys say it is as close as we would get to FI level throttle response on a carburetted bike (about 70-80% close)

    This carb is not for everyone, that's for sure.
     
  7. SilverTooth

    SilverTooth New Member

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    yeah..with my own experience about tuning (DIY) i found very complicated and challenging... this carb surely will surpass the FI models when it comes to performance. hope soon i can afford this one, cheer up to all carb user like me. ^_^
     

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