What was the last year for carburetors? In the U. Diallo Kirchwehm Teacher. When did motorcycles stop using carburetors? Carburetors are your old-school, analog option,and they're what all bikes relied on until electronic fuelinjection began to appear in the '80s. Nowadays, the vast majorityof bikes have EFI, though plenty of smaller motorcycles and scooters still use carbs to help keepthem affordable.
Jiao Fartura Supporter. Matthew S. Candyce Kabytov Beginner. Who bought Harley Davidson in the 70s? Harley actually fought the macho biker image inthe 50s and 60s due to the gang image. Antony Karkampasis Beginner. Are Harley Sportsters fuel injected? All Sportster models began using fuelinjection in place of carburetors in Usue Genealogy Beginner. What should Harley fuel pressure be?
Fuel Pressure should be steady between PSI. Zhivko Maestrojuan Beginner. What does EFI mean on a Harley? Harley -Davidson has used both types of EFI systems on its vehicles. Romy Espallargas Beginner. Which fuel is used in Harley Davidson? Many Harley - Davidson owners have asked ifthey can use 87 octane gas in their motorcycles. Harley - Davidson advises owners of all fuel -injected models to use premium unleadedgasoline.
Ask A Question. Co-authors: Updated On: 19th April, The injectors have a 12 volt power supply to them at all times. The ECU activates the injectors by switching the voltage to ground.
The idle solenoid is activated by a volt signal and allows additional air into the intake manifold to increase the idle RPMs. The main relay is activated by the ignition switch and provides power to all components in the EFI system. If the engine stalls, the ECU will deactivate the relay and shut the fuel pump off as a safety feature. In this drawing the coil or tachometer signal represents the EFI "trigger" signal.
RPM While the real details of what is happening is very complex, we are going to present a greatly simplified version of what the computer happens.
As you can see, the computer in a fuel injection system is doing a lot of things very quickly. While some EFI systems do more than listed above, the description above is a rough idea of the minimum amount of work the system actually has to do. The real activities are much more complex than explained, but you get the idea that your EFI ECU is pretty good at knowing how much fuel your engine really needs.
Choosing a carburetor and tuning it is always a series of compromises. A carburetor maintains a series of fuel circuits to help maintain the best possible fuel mixture. The idle circuit, intermediate and main jetting circuits are used to tune the mixture across the operating RPM range of the engine.
These different fuel circuits can interact with each other creating rich and lean spots in the fuel curve. Some riders will go as far as to add one or more additional fuel circuits Thunderjet in an effort to improve the fuel curve.
The interactions of these additional circuits further complicate the tuning efforts. A change in jetting to one fuel circuit can impact the required jetting in another circuit. Sound complicated? It certainly can be. Lets simplify matters and assume a carburetor with nothing more than an idle circuit and main circuit.
To optimize low RPM performance a small diameter carburetor provides the best performance, but at high RPMs a large volume of air is required to feed the engine. This requires a much larger diameter carburetor. This "signal" must be present to maintain good throttle response. If the diameter of the carburetor is too large for the engine, low RPM performance can be very poor. Most HD mechanics and riders are aware that the "large carburetor" syndrome creates a poor running engine.
This situation does not occur with an EFI engine. With an electronic fuel injection system, the required fuel amount for each RPM and engine load condition is located in the fuel map located in the ECU.
Once this primary fuel amount is known, then the ECU further adjusts the fuel mixture for the engine and air intake temperatures. In many cases, the mixture will even be adjusted for the barometric pressure and altitude. The correct fuel amount is fed into the engine at all times.
This allows engine is allowed to draw all the air it wants. Since more air equates to higher horsepower potential, all the EFI has to do is provide the correct amount of fuel for the increase in airflow. A word about exhausts There are more performance questions about the implications of switching exhausts on injected engines than any other fuel-related topics, and with good reason.
There is plenty of confusion surrounding what happens even with a carburetor and it's all about back pressure. When we talk about a lack of back pressure, we are actually talking about the management of reverse pressure waves echoing up the exhaust system. These pressure waves reflect up and down the pipe both resisting and pulling exhaust gases from the engine but you need to know that any back pressure, or restriction in the exhaust reduces gas flow through an engine at some point in its cycle.
The physical barriers in the exhaust system generate a variety of pressure waves and the time at which these pressure waves arrive at the exhaust valve can improve airflow by pulling air into the cylinder or reduce airflow by pushing against the air coming from the intake. This effect changes with the engine speed. A well designed exhaust system either minimizes these pressure waves, or tries to control their timing to improve power by pulling air into the engine.
The fuel injection system is not directly affected by the exhaust system, but the amount of air getting into the engine is. Since none of the systems used by Harley-Davidson use airflow sensing to establish the fuel mix, the fuel map needs to be altered to ensure a proper mix. When an EFI bike is modified with an improved airflow filter and a performance exhaust system, the EFI fuel map needs to be modified to compensate for the increased air getting into the engine.
Slip-on mufflers, conventional and exhaust systems all allow more air into the engine by reducing the exhaust restriction but they do not significantly alter the pressure waves in the exhaust system - unlike when drag pipes are used, because the restrictions in the exhaust system are decreased and the management of the pressure waves is altered dramatically. A carburetor and injected engine react to a change in pipes in an identical manner.
The difference is in how you resolve the situation. If you hear a whine that sounds likeit's coming from inside the right side of the tank, it's a FI bike. If you hear nothing, it's carbed. Rabah Halbritter Professional. Do Harleys hold their value? Firdaws Immery Professional. What does FLHR stand for? Fredia Emerick Professional. What does FLHX stand for? Ultra Classic Electra Glide Low. Nacera Monni Explainer. What's the biggest Harley engine? It's big, cubic inches. Tifany Meuerer Explainer.
Gintaras Ghemawat Explainer. What should Harley fuel pressure be? Fuel Pressure should be steady between PSI. Arouna Vandevoorde Pundit. What year did Harley go to 96 cubic inch? Davyd Molodkin Pundit. What is the difference between a Harley Dyna and Softail? Frame and Body. What engine is in my Harley? Harley -Davidson has produced an array of engines to power its classically-styled motorcyclesthroughout the years, ranging from the original 25cubic-inch single-cylinder engine built in to the massive cubic-inch Twin Cam V-twin engine that powers all Harley Big-Twin models built in Lokman Yrurzun Pundit.
What years are Harley Evo motors? The Evolution engine popularly known as Evo isan air-cooled, degree, V-twin engine manufactured from by Harley -Davidson for the company's motorcycles. Servilia Vendeira Pundit.
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