Name: CDI Electronic Ignition Unit For Single-Cylinder Gas Engine
Brand: EPHIL
SKU: 230207058

EPHIL: Your Trustworthy CDI Electronic Ignition Unit Supplier!

EPHIL is the leading supplier of gasoline engines and power systems for model aircraft and drones. Our company was established in 2020. Our main products include aircraft gasoline engines, glow gasoline engines and engine parts. Some models are equipped with larger air, fuel and oil filters, hardened crankshaft journals and self-draining choke carburetors . These engines are widely used in model aircraft, drones and other equipment, with powers ranging from 100 horsepower to 375 horsepower, and are exported to more than 25 countries and regions.

Rich Experienced

Our team consists of several engine engineers, electrical engineers, and product designers. We are good at engine design, production and debugging, and work closely with well-known companies such as Kenncth, Vossen, Westin, ACDelco, Coverking, etc.

High Production

We have our own R&D center and complete production workshop, equipped with professional cylinder processing, quality measurement, CNC, precision lathes and other equipment, which can fully cover the needs of large-volume urgent orders.

Quality Assurance

All the products have registered trademarks in Germany and the United States, invention and design patents in the United States, Japan and China, and have obtained CE, FCC certification and RoHS certificates.

Customized Services

These engines are widely used in remote control aircraft, aircraft models, and UAV models, and support OEM and ODM custom designs to provide versions with different capacities and strokes.

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What is CDI Electronic Ignition Unit?

A Capacitor Discharge Ignition or CDI is an electronic ignition device that stores an electrical charge and then discharges it through an ignition coil in order to produce a powerful spark from the spark plugs in a petrol engine. Here the ignition is provided by the capacitor charge. It is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, turbine-powered aircraft, and some cars. Capacitor Discharge Ignition system is charging constantly and sends a large voltage charge (380–450 V) to the coil, producing a spark, at a higher voltage with a shorter duration compared to Inductive ignition systems.

Features of CDI Electronic Ignition Unit

Good Compatibility

Our ignition units are suitable for use with any 2 coil ignition unit as well as compatible with onboard CPU controlled ignition, vehicle load and all types of control systems to increase spark, improve combustion and overall electrical performance.

High Accuracy

Our CDI ignition units have built-in launch limiters and programmable timing delays to receive the magnetic induction signal from the propeller hub faster and precisely control ignition timing.

Flexible Ignition

The crankcases of these ignition units are equipped with Hall sensors that accurately provide ignition timing and the appropriate voltage to the spark plug based on the different needs of each engine at actual angles of rotational speed.

Easy to Replace

When they break, you will not face the problems of difficult starting of the engine, no spark at the plug, and misfire because their construction is very simple, so replacement as well as maintenance operations can be done quickly.

Types of CDI Electronic Ignition Unit

AC-CDI Module

The electrical source of this module gets only from the AC generated through the alternator. This is the basic CDI system used in small engines. So, not all the ignition systems which have small engines are not CDI. The whole ignition system, points & coils are below the magnetized flywheel.
These DC current supplies throughout a wire toward an ignition coil placed at the external of the engine. Sometimes, the points were below the flywheel for engines with two-stroke & usually on the camshaft for 4-stroke engines.
Some types of electronic ignition systems will exist so these are not capacitor discharge ignition. These types of systems utilize a transistor for switching the charging current toward the coil ON & OFF at suitable times. This removes the trouble of burned as well as worn points to provide a hotter spark due to the quick voltage raise as well as collapse time within the ignition coil.

DC-CDI Module

This kind of module works with the battery & thus an extra DC/AC inverter circuit is used within the capacitor discharge ignition module to increase the voltage from 2V DC – 400/600 V DC to make the CDI module somewhat larger. But, vehicles that utilize DC-CDI type systems will have more accurate ignition timing, as well as the engine, can be activated more simply once it gets cold.

Components of CDI Electronic Ignition Unit

A Capacitor Discharge Ignition consists of several parts and is integrated with the ignition system of a vehicle. The foremost parts of a CDI include the stator, charging coil, hall sensor, flywheel, and timing mark.

Flywheel and Stator
The flywheel is a large horseshoe permanent magnet rolled into a circle that turns-ON the crankshaft. The Stator is the plate holding all of the electrical coils of wire, which is used to power ON the ignition coil, bike's lights, and battery charging circuits.

Charging Coil
The charging coil is one coil in the stator, which is used to produce 6 volts to charge the capacitor C1. Based on the flywheel's movement the single pulsed power is produced and is supplied to the sparking plug by the charging coil to ensure the maximum spark.

Hall Sensor
The Hall Sensor measures the Hall effect, the instantaneous point where the flywheel's magnet changes from a north to a south pole. When the pole change occurs, the device sends a single, tiny pulse to the CDI box which triggers it to dump the energy from the charging capacitor into the high voltage transformer.

Timing Mark
The timing mark is an arbitrary alignment point shared by the engine case and stator plate. It indicates the point at which the top of the piston's travel is equivalent to the trigger point on the flywheel and stator. By rotating the stator plate left and right, you effectively change the trigger point of the CDI, thus advancing or retarding your timing, respectively. As the flywheel turns fast, the charging coil produces an AC current from +6V to -6V.

Trigger Circuit
The trigger circuit is a switch, probably using a Transistor, Thyristor, or SCR. This triggered by a pulse from the Hall Sensor on the stator. They only allow current from one side of the circuit until they are triggered. Once Capacitor C1 is fully charged, the circuit can be triggered again. This is why there is timing involved with the motor.

Advantages and Disadvantages of CDI Electronic Ignition Unit

Advantages

The advantages of CDI include the following.

The major advantage of CDI is that the capacitor can be fully charged in a very short time (typically 1ms). So the CDI is suited to an application where insufficient dwell time is available.
The capacitor discharge ignition system has a short transient response, a fast voltage rise (between 3 to 10 kV/ µs) compared to inductive systems (300 to 500 V/ µs), and a shorter spark duration (about 50-80 µs).
The fast voltage rising makes CDI systems unaffected to shunt resistance.

Disadvantages

The disadvantages of CDI include the following.

The capacitor discharge ignition system generates huge electromagnetic noise and this is the main reason why CDIs are rarely used by automobile manufacturers.
The short spark duration is not good for lighting relatively lean mixtures as used at low power levels. To solve this problem many CDI ignitions release multiple sparks at low engine speeds.

Difference between Inductive and Capacitive Ignition System

Traditional automotive ignition systems can be either inductive discharge or capacitive discharge. Traditionally, old-school stock engines had inductive discharge systems that rely on the coil to do most of the work. The coil takes in battery voltage (typically, 12 to 14 volts) and steps it up to thousands of volts to create a hot enough spark to jump the spark-plug gap. At higher rpm, there may be insufficient time for the coil to recover and step up the battery voltage between firings.

Capacitive discharge (CD) systems step up 12-volt battery voltage to 500 volts or more, storing that power in a capacitor that's always ready whenever the distributor sends a trigger signal. When boosted again through a matched performance coil, the resulting charge can output significantly higher voltages than most inductive systems.

The drawback on a traditional CD system is that although the spark is extremely hot, it is of shorter duration than the spark produced by an inductive system. This is primarily a problem at lower rpm when the combustion process is slower and fuel mixture is typically richer.

Most CD ignitions can tolerate a wider variety of input voltage compared with an inductive system and still function satisfactorily. On the other hand, an inductive system that's still points triggered needs a ballast resistor to drop voltage to keep from burning out. Some short-duration racers don't run alternators; if a system can operate satisfactorily on less than 12 volts, it may be beneficial if running solely off battery power.

Ways to Troubleshoot A CDI Electronic Ignition Unit

How to Check
Start by checking the owner's manual for CDI box in order to find the electrical resistance specs of the device. If the CDI box works properly, the ohm meter's readings should match with the specs.
Starting from the input wire, just plug the ohm meter in. After that, simply turn over the engine where the CDI box is attached. Take note of the readings, and if they are right within the range that is listed in the manual, all you have to do is proceed in order to check the output wire.

How to Troubleshoot
Determining whether electrical problems are due to a malfunctioning CDI box can prove complicated. If you don't already have a CDI box on hand that you know is in good working condition, it will be expensive to purchase another one. Troubleshooting is complicated and multi-faceted, involving multiple parts of the electrical system. There are some symptoms of CBI box malfunction, including:

Misfires
Rough running
Difficulty starting
Other ignition problems
Engine stalling

However, these symptoms can also indicate other problems like a faulty fuel pump or bad spark plug. Instead of jumping straight to the CDI box as the culprit, check these parts of your electrical system first:

Battery: Use a voltmeter to ensure the proper voltage. Also check the connections for gaps, corrosion, or any other issues.
Wiring: Make sure all the wires are attached (specifically ground wires) and functioning.
Fuse: Check the main fuse (and keep a spare in your tool kit), and if it consistently blows out, investigate other possible electrical problems.
Stator: Stator provides the power to the battery to keep it full while the plane runs. Check the stator for voltage and resistance (while unplugged) to see if it could be the source of power issues.
Regulator/rectifier: This part converts power from AC into DC and controls the voltage of the transfer. You'll need a multimeter to check the regulator/rectifier function.

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Frequently Asked Questions of CDI Electronic Ignition Unit

Q: What is the CDI ignition system?

A: In a CDI system, a charging circuit charges a high voltage capacitor, and at the instant of ignition, usually determined by a crank position sensor, the system stops charging the capacitor, allowing the capacitor to discharge its output to the ignition coil before reaching the spark plug.

Q: What is the purpose of the CDI?

A: Essentially, a CDI box controls a motorcycle's ignition system by starting the ignition and combustion process. A pulse of voltage from the motorcycle battery passes through the CDI box to fire up the spark plug.

Q: What are the symptoms of a bad CDI unit?

A: If You Actually HAVE a : "CDI" (Not an Electronic Igniter, which I Suspect): It can manifest a failure in hard starting, no starting, bad running/idle, poor acceleration, or sparks can fall off above 4,000 RPM. It can fail Just Like a Real, Live Igniter box.

Q: What is the difference between CDI and ignition module?

A: Inductive ignition systems produce a spark, at a lower voltage with a longer duration compared to capacitor discharge ignition systems. A CDI, Capacitor Discharge Ignition system is charging constantly and sends a large voltage charge (380–450 V) to the coil.

Q: Is CDI ignition AC or DC?

A: Your CDI has two plugs, a 4-pin and a 2-pin. The 4-pin side may have 3 or 4 wires connected to it (both AC and DC versions). If the 2-pin connector has only 1 wire going to it, it's a DC CDI. If there are 2 wires attached to the 2-pin connector, then it's an AC CDI.

Q: What happens if CDI goes bad?

A: Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor. These mentioned symptoms can be confusing and one has to be careful before concluding that the problem is with the CDI.

Q: What causes CDI failure?

A: If you are Positive it's a CDI (after market on a Racer) and Not just An igniter(as 99% Are) , well, what usually causes solid state electronic failure? Over voltage; sometimes under voltage; overheating due to clogged heatsink fins or loose heatsink. Vibration, age. Water entering.

Q: How does CDI know when to fire?

A: In CDI, the magneto-flywheel assembly along with pickup coil generates ignition timing signals which is one negative and one positive pulse separated by some angular distance used to decide the ignition time for spark.

Q: How do I know if CDI is working?

A: Place the black multimeter lead on one of the terminals on the CDI box. Touch the red multimeter lead to each of the other terminals on the CDI box, one at a time. If the multimeter reading changes when you touch the red lead to different terminals, then the CDI box is functioning properly.

Q: Does CDI ignition need battery?

A: A CDI box works via the voltage from your motorcycle battery, and the electrical load discharges in one operation, starting the ignition and combustion processes. The capacitor can ignite without a battery connection, and there's a built-in capacitor for kick-starting.

Q: How does a CDI know when to spark?

A: The basic CDI system is a trigger mechanism, coils, and a box, often black, with capacitors and other circuitry inside. The trigger tells the box to fire, the box determines when to fire which coil with the capacitors, and zap goes the spark plug, ad infinitum.

Q: What is the difference between CDI unit and rectifier?

A: A CDI charges a capacitor and then discharges the capacitor to make a spark. A DC CDI is powered from the battery or rectifier. An AC CDI is powered directly from the alternator and has its own rectifier.

Q: Are all CDI units the same?

A: NO. Some engines run a completely AC CDI system, some are DC CDI. The CDI 'box' will have built in parameters (ignition advance curve) that is appropriate for that particular engine. That being said, the fundamentals of Capacitor Discharge Ignition ARE the same.

Q: What are the advantages of CDI engines?

A: CDI engines consume relatively low amount of fuel, are eco-friendly, offer more power and higher torque. Such renowned manufacturers, as Bosch and Delphi, produce injection systems for such motors.

Q: What are the two types of CDI?

A: The DC-CDI works well in areas where there is extreme cold temperatures and is very precise during ignition. The AC-CDI on the other hand, is simpler and rarely runs into problems. It is smaller and convenient too.

Q: What are the 3 types of ignition systems?

A: There are three basic types of automotive ignition systems: distributor-based, distributor-less, and coil-on-plug (COP). Early ignition systems used fully mechanical distributors to deliver the spark at the right time.

Q: Can a car start without ignition module?

A: Without a properly functioning ignition control module, a vehicle's engine would fail to start or run inefficiently. The module plays a vital role in ensuring that the spark plugs fire at the right moment and with the correct intensity, allowing for efficient combustion and power delivery.

Q: Does CDI control RPM?

A: The other way around, a CDI can be used to limit the max RPM and so max. speed by delaying the ignition so much, that the motor doesn't gain any power from the combustion. One reason might be to protect the motor from too high RPM, but often, this is used to fulfill legal restrictions.

Q: Will a bad CDI still spark?

A: Generally a bad CDI won't fire at all since everything goes through the box to fire the motor. Since you still have fire, I would rule that one out. -Check to make sure the ignition leads aren't shorting.

Q: What is the voltage of CDI ignition trigger?

A: The typical voltage of a motorcycle pickup coil pulse that is sent to the Capacitor Discharge Ignition (CDI) system is usually in the range of 50 to 100 volts. This pulse is generated by the pickup coil as the engine rotates, and it is used by the CDI to trigger the ignition spark at the correct time.

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