A band aid fix is to use a lower resistance coil and add a ballast resistor. 3) Is another test for full 12v when " you have your multi meter connected to the coil, crank the car and see what the VOLTAGE  drops to AND you should also look check the CURRENT as well. When the points are closed the coil is charging. The required voltage changes constantly. 1)  " is the only way to test this primary and secondary resistance when starting the car " ? That means you will have a more powerful spark when starting than you do when the engine is running which is good since it's harder to initiate combustion in a cold engine. This arrangement is what makes CDI modules more complex and costly than a conventional electronic ignition. Even if the exact amount of gas was mixed with the air it doesn't mean that every cubic centimeter of the cylinder has the perfect air fuel ratio. Yella has had 12v for about 10 years now. Early engines used a glow plug. I checked the colour of the two wires that lead from the isolator switch and these are not the ones that are " pink" that are bound into the harness. If you want to make a spark you need a spark gap. Whilst just putting a new 12 wire to the coil this will fix it there are two parts to the 12v wire Voltage and Current, thanks for the input where all learning something here, good write up before with the pics  From what i sort of think  know  i have three   questions for a person who is far more trained than my youtube brain 1)  " is the only way to test this primary and secondary resistance when starting the car " ? It's even possible there won't be enough energy to make a spark in the first place. An automatic current limited works well but puts a greater load on the ignition module. You can even disconnect the power and the capacitor will retain its charge. the magnetic field builds up(outward arrows in coil) over a certain number of time constants to hopefully saturate the coil during dwell ( charge time). To check a 12 volt coil, set the multimeter to at least a 200 Ohms setting. That graphic (12 Volt Ignition Coil Wiring Diagram How To Wire A Coil To Points with Ignition Coil Condenser Wiring Diagram) previously mentioned is usually labelled using: coil, condenser, diagram, . An engine ingests fuel, along with air so the fuel will burn, compresses it then burns it. The center electrode is what carries the electricity into the combustion chamber. However, inductive ignitions can't keep up on a high revving, multi-cylinder engine running a single coil. Conventional electronic ignitions simply replaced the points with a transistor but CDI completely reinvented the way the spark is generated. You will see voltage converters used mainly on cars and street bikes where there is a battery and charging system to power it. Personally I think it is a fuel not electrical problem. Does your car still have points ignition? Sometimes that was as simple as a copper rod threaded into the head and heated with a torch. Notice how the current flows through the diode, bypassing the coil. The second connection is common between the primary and secondary. Had nothing to do with the stomach ! The more current you run through a coil the greater the magnetic field. Let's say you open up the spark plug gap and now 150 volts is required to fire the coil. I had a health scare last week and ended up in hospital with pericarditus - it's inflamation of the sack around the heat - thought i was having a heart attack - yikes ! With an inductive ignition all that's needed to make enough juice for a spark is the ignition coil, a switch and a low voltage power source. In two milliseconds the coil will only reach four amps before it has to fire again. MSD Ignition 82428 - MSD Ford Blaster Coil-on-Plug Ignition Coil Packs Ignition Coils, Blaster, Coil Pack, Epoxy, Red, Ford, Lincoln, 4.6L/5.4L, SOHC, 2V Set of 8 Part Number: MSD-82428 At hospital they did all the test and my heart is fine, apparently MUM put a high volume one in and left the pipe cleaners out of the push rod arteries , My Oil is flowing well and the pressure is not to high. With competitive prices on high quality products, our ignition coil range is the ideal choice for you. It is called a tank ciruit. Once the condenser is charged ( about 10 times supply voltage due to EMF) the charged condenser will then discharge back through the primary winding (single black arrow) to battery  again energising the coil.This will happen until the energy is wasted away until the next points closing comes along. Check here for special coupons and promotions. This lead will usually be marked with a “+”. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. On this page I'll do my best to explain how ignition systems work. Better fuel systems, intake manifolds, and heads are constantly being developed so that the mixture inside the combustion chamber stays as accurate and consistent as possible. The timing issue is covered on the Ignition Curve page. Popular . An inductive ignition charges a coil then allows the primary voltage to rise high enough to initiate a spark. It's also used on many quads and enduros, even those that have a battery and charging system. If voltage drops to 10 volts it will only add 1 ohm so peak current will remain 4 amps. 4) if someone can clarify the role of the alternator power and if this comes into play in the equation. Aramox 12 Volt Ignition Coil,3 Ohm Non Ballast Ignition Coil for Lucas 12 Volt Applications DLB101. i have no idea how the car is wired and may only be getting a 6 volts to the coil and this is what is causing the high rev breakdown. The converter consists of an oscillator to convert the 12 volt DC to 12 volt AC, a transformer to step up the AC voltage to several hundred volts, and a rectifier to make the AC back into DC. View more. As stated before, with more energy you will have longer spark duration and can run larger spark gaps. for the coil to reach six amps. If you swap to a coil with a 0.5 ohm primary it will add 2.5 ohms. A common approach to covering up this deficiency is to fire the CDI multiple times at lower rpm. In any other electrical system this would be called a transformer. High Performance Ignition Coil 12V SUZUKI JR50 RM80 85 100 125 250 Motorcycle. A big heat sink is required to dissipate the heat from the switching transistor since it is still using resistance to limit current. The spark gap threads into this hole and plugs it so the chamber is sealed. Attach both leads of the meter to the coil-terminals with black to the negative terminal and red to the positive one. The transformer typically has only a dozen or so turns on the primary but many thousands on the secondary. Increasing the spark plug gaps without increasing the amount of energy stored in the coil can actually hurt performance. so there is no pink wire that i can see at all but will unwind the loom further over the wend. Fly me up................................................$80ph. On my HJ I cut the pink resistor wire out completely (it seemed to be melting). Point bounce can also be caused at high revs kind of like valve bounce, this without going into much detail will not produce enough volts needed to ignite the air fuel causing spluttering etc. A spark plug has three main parts, the center electrode, the porcelain insulator, and the body. If it is an old system then it should be ~ 12 v as shown below when the car is not not running as no switching is taking place. The distributor is fed a spark through a coil lead, which is the same thing as a spark plug wire. The spark gap threads into this hole and plugs it so the chamber is sealed. Internal combustion engines convert the energy of burning fuel into mechanical motion. This design is generally used on dirt bikes and lawn equipment where there is no battery or charging system. The alternative is to use the alternator to produce a high voltage AC signal. The biggest problem with using gasoline is that it must be vaporized and mixed with the proper ratio of air or it will not burn. Making the spark travel through more air fuel mixture increases the odds that it will hit a pocket that is combustible. Notice amps is squared which means small changes in amps will greatly effect the amount of energy stored. That is not much time at all, so what's the problem? That is the biggest issue with inductive ignitions. This leads to misfiring at higher rpms. Hi tension will be produced in the secondary windings to cause a spark at SG (spark plug). There are a few variations to CDI circuits but the one shown is a very common scheme. A CDI spark may last only 50 microseconds (0.00005 seconds) where the spark from an inductive ignition typically lasts about 1 millisecond (.001 seconds). This makes the circuit simpler since there is no longer a ballast resistor or bypass circuit. Now if the voltage drops to 9 volts when the starter is engaged your peak current will be 6 amps. With electrical's I can check a pulse but that's about it. At 1000 rpm it takes 15 milliseconds for the distributor to turn 45 degrees, so the coil will be charging for 10 milliseconds and given 5 milliseconds to discharge. An ignition coil isn't fed with a constant AC signal. How to Tell if an Ignition Coil is Bad. I assume it's something along these lines; put one of the red terminals ( multi) onto to one of the coil leads. All we need is one spark so all we are going to put into the primary is one voltage spike. When you put power to a capacitor the current starts extremely high then drops exponentially as the capacitor charges. The goal is to compress it as much as you can without it self igniting. You may see "high performance" coils advertises as 50,000 volt coils but all that is meaningless since under most conditions you will only need 5,000 - 10,000 volts. This is why, on many CDIs, you see a negative voltage when probing the positive coil lead. The voltage will rise until it reaches 150 volts at which point the spark plug will fire. The internal combustion engine is the most popular motivator of vehicles big and small. or condensor is a dead short initially but charges over  a time constant. Since the current ramps up gradually and at a known rate, the computer starts charging the coil late enough that there won't be enough time for it to go over current. Running a coil with a high primary resistance is the simplest way to limit current but far from the best. The process starts when the switch is open. Takes and Auto-elect about 30 minutes and about the same sort of cash. The air fuel mixture is swirling around in the chamber, the longer the spark is present the better the odds are that a good pocket of fuel will run into it and burn. The other end of the coil lead is hooked to the coil. The basic components of a CDI are a high voltage power supply, a capacitor, a switch, and a coil. If not then the voltage is being reduced either due to a fault to earth in the primary winding or the contacts are very dirty and have carbon buildup across them or the capacitor is faulty. But then the above post (along with the "how to test for spark" video) state that I should be getting 12V constant to the coil with a pulsing ground from the PCM. However, the inductive ignition took 3 milliseconds to charge where the CDI charges in only a few microseconds. Whilst just putting a new 12 wire to the coil this will fix it there are two parts to the 12v wire Voltage and Current  thanks for the input where all learning something here, Community Forum Software by IP.BoardLicensed to: GMH-Torana Website and Forums, " Lucky " the lime green metalic 72 GTR" and " Rocket the NOT so GTR or XU1" 73 S Pack, Before you can figure out how to make something work better you first need to understand how it works. Edited by hanra, 20 November 2014 - 06:44 PM. thats for the ideas on this and getting 12v. As in other description the cap. Firing a spark through an air fuel mixture requires more voltage than it would in pure air, especially with exotic fuels. Internal combustion engines convert the energy of burning fuel into mechanical motion. Coils were running cooler, so the peak current could be increased. Just as knowing when your spark plugs are failing is important, it’s equally important to be aware of the signs of a faulty ignition coil. Please re-enable javascript to access full functionality. The old time ignition circuits I have seen on automobiles had a 6 (or 12) volt battery, with "points" inside the distributor that were opened and closed with a cam that ran off the camshaft. When current is high and you try reducing it, the inductor will increase voltage to try and keep the current high. 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