Regan Brown
The use of distributors in fuel-injected cars is a topic that has evolved over time. While older cars from the 1970s and 1980s commonly featured distributors, modern vehicles have moved away from this setup. Today, many cars with fuel injection engines do not utilize distributors or distributor caps, opting for alternative ignition systems. However, it is worth noting that some late-model vehicles with efficient fuel injection systems may still incorporate distributors, showcasing varying approaches in automotive design. This evolution in technology has sparked curiosity about the role of distributors and their presence in fuel-injected cars, leading to discussions on the advantages, disadvantages, and alternatives in modern automotive engineering.
| Characteristics | Values |
|---|---|
| Do fuel-injected cars have distributors? | Some late-model vehicles with fuel-injection systems still have distributors, but many modern cars do not have distributors or distributor caps. |
| Distributor caps | Some fuel-injected engines have distributor caps with computer controls. |
| Timing advance | "Chip-controlled distributors" in fuel-injected engines have electronically controlled timing advances by an engine computer. |
| Vacuum and centrifugal advance mechanisms | Many distributors used with electronic fuel injection engines do not have vacuum and centrifugal advance mechanisms. |
| Single-point injection | It is more common for fuel-injected engines to have a single injector for all cylinders or one injector for every two cylinders. |
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What You'll Learn
- Modern cars don't always have distributors or distributor caps
- Some late-model vehicles have efficient fuel-injection systems and engine controls
- GM's HEI provides high rpm performance and output
- Distributor advance has two types: vacuum and mechanical
- Chip-controlled distributors have timing controlled by an engine computer
Modern cars don't always have distributors or distributor caps
However, some late-model vehicles with efficient fuel injection systems and engine controls still have distributors, and their plugs can last for a long time. For these vehicles, it is not necessary to replace a good, expensive set of plugs unnecessarily.
Distributors were once a common feature in cars, with their simple and basic design allowing for crude tuning of a car's performance. While they are less common now, they can still be found in some modern vehicles.
Chip-controlled distributors are one example of a modern distributor type. These are used with electronic fuel injection engines and do not have vacuum and centrifugal advance mechanisms. Instead, the timing advance is controlled electronically by an engine computer, allowing for more precise timing adjustments based on a wider range of factors beyond just rpms and intake manifold vacuum.
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Some late-model vehicles have efficient fuel-injection systems and engine controls
Fuel injection systems have been used in cars since the 1950s, and electronic fuel injectors were widely adopted in European cars from around 1980. Today, all cars sold in the United States have fuel injection systems, and it is the universal standard for almost all cars and light trucks worldwide.
The primary difference between carburetion and fuel injection is that fuel injection atomizes the fuel through a small nozzle under high pressure, while carburetion relies on suction created by intake air accelerated through a Venturi tube to draw fuel into the airstream. Fuel injection systems revolutionized the efficiency and performance of internal combustion engines by injecting fuel directly into the combustion chamber. This precise delivery of fuel enhances fuel atomization, resulting in improved combustion efficiency and power output while reducing emissions.
Advancements in fuel injection systems continue to be made, aiming for even greater efficiency, reduced emissions, and enhanced performance. Innovations such as higher-pressure injection systems, more precise control algorithms, and integration with electric propulsion systems are on the horizon, paving the way for a more sustainable automotive industry.
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GM's HEI provides high rpm performance and output
GM's High Energy Ignition (HEI) is an electronic ignition system designed by the Delco-Remy Division of General Motors. It was used on all GM vehicles in the North American market from 1975 through the mid-1980s. The system provides up to 35,000 volts to fire the spark plugs and increase spark plug life, especially when unleaded fuel is used. The HEI system has 40% more voltage output and 85% higher energy level than conventional breaker point systems, allowing it to fire lean fuel mixtures even under adverse conditions.
The dwell in the HEI system increases as engine rpm increases, providing high rpm performance and high output. This is in contrast to some other systems that retained fixed dwell. The increased secondary inductance in the HEI coil provides a higher voltage and a longer spark duration than conventional systems. This results in a more powerful spark, which allows for a wider spark plug gap and ensures the ignition of a fuel/air mix that may not be optimal.
The higher voltage output of the HEI system required new insulation materials to prevent ignition failure due to carbon tracking. A special thermoplastic, injection-moulded, glass-reinforced polyester material is used for the distributor cap and rotor to provide the necessary dielectric and insulation properties. The high voltage terminals used in the distributor cap are similar in appearance to spark plug terminals, allowing for easier attachment and better sealing of the connections. Latches are used to ensure proper connections of the plug wires to the cap, preventing any loosening or movement that could reduce the moisture of the connection.
The Performance Distributors' Rev Limiting Module is a popular upgrade for the HEI system, offering high-dwell operation and outstanding performance. This module incorporates an RPM-limiting feature that allows the user to control the engine's peak RPM in increments of 100, starting at 5,000 to a maximum of 9,500 rpm. This upgrade improves throttle response and low-end performance, while also providing peace of mind by protecting the engine from spinning at too many RPM.
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Distributor advance has two types: vacuum and mechanical
The centrifugal advance system in a distributor advances spark timing as a function of engine rpm. The amount of advance and the rate at which it comes in are determined by the weights and springs on top of the autocam mechanism. The amount of advance added by the distributor, combined with initial static timing, is "total timing". Vacuum advance, on the other hand, responds to engine load and rapidly changing operating conditions, providing the correct degree of spark advance at any point in time based on engine load, to deal with both lean and rich mixtures.
Rich mixtures burn faster than lean mixtures, so they need to have "the fire lit" later in the compression cycle (spark timing retarded slightly) so maximum cylinder pressure is still achieved at the same point after Top Dead Center (TDC) as with the lean mixture, for maximum efficiency. When you accelerate, the mixture is instantly enriched and burns faster. When the throttle plates open, the manifold vacuum drops, and the vacuum advance return to zero, retarding the spark timing back to what is provided by the initial static timing plus the centrifugal advance provided by the distributor at that engine rpm.
Vacuum-advance diaphragms can malfunction, so they should be checked and replaced if necessary. Mechanical weights should be taken off and their pivot points cleaned and lubricated.
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Chip-controlled distributors have timing controlled by an engine computer
While many late-model vehicles have moved away from distributors, some fuel-injected cars still have them. These cars have efficient fuel injection systems and engine controls, and their plugs last a long time.
Computer-controlled compatible distributors, or chip-controlled distributors, are a type of distributor where an external computer or ECU (engine control unit) controls the timing and the coil. The distributor sends a signal from its internal pickup module to the ECU, which then sends a signal to the coil, telling it to fire. The current travels from the coil to the distributor cap and rotor, and the spark is routed to the plug. This process is the same as in other distributors, but the timing is controlled by the ECU.
Computer-controlled distributors have several advantages over other types of distributors. They require less maintenance as there are no weights, springs, points, or condensers to wear out. They also allow for easier ignition timing adjustments, which can be made through the ECU.
In contrast, distributorless ignition systems fire the spark plugs directly from the coils. The spark plug timing in these systems is controlled by an ignition module and the engine computer. Distributorless systems offer several benefits, including no timing adjustments, no distributor cap or rotor, and no moving parts to wear out. They also eliminate the problem of moisture accumulation in the distributor, which can cause starting issues.
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Frequently asked questions
Some fuel-injected cars have distributors, but many modern cars do not.
Modern cars have replaced the distributor with an ignition coil, which provides a high-voltage, long-duration spark across an ultra-wide spark gap.
Ignition coils can supply the required energy for modern engines, especially when the output has to be divided among four, six, or eight cylinders.
Many fuel-injected cars with distributors do not have vacuum and centrifugal advance mechanisms. Instead, they use "chip-controlled distributors", where the timing advance is controlled electronically by an engine computer.
