In the mid-'70s, leaner mixtures demanded greater voltage and more spark energy to kick off combustion. Resistance is futile: Coils with even the same turns ratio can still have varying amounts of resistance. #2. At some engine rpm point, the coil can't fully recharge before it becomes time to fire the next spark plug in the engine's firing order. Actually, an HEI draws only 2- to 3-amps, compared to the approximate 6-amps an external oil-filled coil draws. I tested three coils this morning with the waveforms . Ideally, the points would only close and dwell long enough to build up what was needed to create a nice magnetic field in the coil. Privacy Statement - While the coils draw the same power as with points when they are closed, the current power draw time for the electronic switch is increased from 34.29 Watts to 55.88 watts power consumption, just by using the Dyna-S. Now add 3 ohm coils And the Dyna-S. 12.6V / 3 ohms = 4.2 amps. See what I mean, Armour? If you only charged the coils at 2ms/10A, then the number would be 33% less. My question is how much current draw does it take to open that 24vac coil on the contactor? If they enroll we will email you a discount too. In review, an oil-filled ignition coil requires about 3-5 amperes of current at 12 volts to produce 20-30 kV, while a modern e-core or coil-on-plug configuration might require as much as 10 amperes of current at 12 volts to produce 30-60 kV of high-intensity spark. Cookie Policy - Myth 4: A stock H.E.I. We have to account for the 80% breaker rule. The answer IS definitive, IF you care to pay attention to physics and math. V6 engines will require more power to start and the starter can draw up to 175 amps. What kind of tool do I need to change my bottom bracket? Dyna states in their installation instructions that the minimum requirement for the Dyna S is 3 Ohms, but their 5 Ohm coils (or for that matter, stock Honda 5 Ohm coils in really good condition) work fine with the "S". About Us - I keep using 300va transformers in my panel builds but never take coil currents into account mainly only have up to 8 contactors. There are 2 coils driven by the battery. Plus, you know, calculus. Unexpected results of `texdef` with command defined in "book.cls". "). For instance, MSD's E-core and U-core coils have proven to be more efficient than traditional canister configurations for radiating heat while stepping up the voltage between windings, due to their smaller and more enclosed area where the field collapses. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. it requires a unique spark plug lead connection that incorporate a ferrule. Send this link to your mates to get $50 OFF their first course. Or if it draws 10 amps, where is the 120 watts of power dissipated? Normal Starter Amperage Draw: A good starter will normally draw 125 to 150 amps, when cranking a four cylinder engine. No in general it draws less. Login with username, password and session length. Myth 1: Inductive ignitions, like HEI - High Energy Ignitions, aren't as good for high performance engines and racing motors as CD-capacitive discharge ignitions. The 1949 - 1951 engines crank 130 rpm (without an automatic transmission) GENERATOR DOES . Depending on what you have coils could pull 7A each. In reality this is a bit of a simplification, as we're ignoring the fact that the injector is an inductive load, so the current that flows through it also depends on how long a voltage has been applied to it. but for sizing your wires, ignoring this part of the equation it totally fine :-). Discussion and questions related to the coursePractical Motorsport Wiring - Professional Level, 2 100ms/rev x 1000rpm = .001sec/rpm x 1000 rpm = 1 sec of current draw at 4 amps per minute while running at 1000 rpm. (For a discussion of capacitive discharge vs. traditional pure inductive ignition systems, see: "Inductive vs. Capacitive Discharge Ignition Systems. Send this link to your mates to get $50 OFF their first course. That would depend on the number of coils / cylinders. The OE GM/Delco module has a dwell predictor circuit that shortens lower-rpm dwell time to 15 degrees and lengthens it to as high as 40 degrees at high rpm. Blue is coil current, red is ecu signal voltage, green is coil voltage and brown is coil earth. The best answers are voted up and rise to the top, Not the answer you're looking for? Turns for the better: The relationship between the coil's primary and secondary windings responsible for voltage step-up is termed the "turns ratio." Now that amperage number there is very important to remember . Coil still gets pretty toasty after a while. Josey Wales. Anyone have any data on how many volts & amps are produced by the modern solid-state Briggs & Stratton magnetos (excluding the spark plug) ? My first post here. If it's not for you, simply tell us and we'll quickly refund every cent. Reply to joel89. They don't draw any current 35%~45 % of the time when engine is running. I'm familiar with ohms law but have only ever used it to correlate/calculate Volts/Amps/KW conversions in 240 & 415v. Posts, I've attached amperage graph for 115 coils (source: https://www.sxoc.com/vbb/showthread.php?584905-A-quick-how-to-use-VAG-coil-on-SR20). I used a Pico Scope 2202 and a Pico TA018 current clamp to measure current draw from the coil and establish the charge time (dwell) required for maximum spark energy (saturation?). At 12.0 volts the current draw went to 0.13A. The LS injector is 14 Ohms = 1 AMP at 100% Duty Cycle (14 Volts) = 4 AMP each side. Always size your wire and it's length to the current demands. The lower amperage draw actually results in a much cooler running HEI coil. live webinars, video lessons and discounts on courses. Several factors play into this, including the operating voltage and the state of the starter and wires. I'd like to throw a ignition run/off switch on handlebars for safety in an emergency. Trademark Office. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I'm playing with the thought of installing the AMR monster ignition coil for a Raptor which seems more suitable. It only takes a minute to sign up. Slow cranking and high current draw typically indicate worn bearings or bushings inside the starter. Always refer to As a result, there is not enough voltage left, to power the ignition system and fuel injectors. What are the benefits of direct ignition (coil on plug) system? Usually 10 amps or less - the wires to the coil tend . An HEI coil also runs cooler because it is encapsulated in thermal epoxy. The coils are NOT the same for LS engines as there could be five different choices. Re: Dyna ''S'' Ignition - what coils are best/correct ? 20 How can I test and find the polarity of an ignition coil (that's not connected to a car) using a multi-meter, Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. The coil is the part of a car's ignition system that takes the battery's 12-volt output (called low-tension current) and transforms it into as much as 45,000 volts (called high-tension current) before then supplying it to the engine's spark plugs. Capacitors charge far more quickly than a coil, and the best of these systems can fully charge up to as high as 15,000 engine rpm. You're "too busy" to take 30 seconds out to take the measurement, but want someone else to do it and report back? Generally the coil will be working on about 6-7 volts. 85 amps. Does Chain Lightning deal damage to its original target first? For best results with the Dyna FS ignition, use a resistor spark plug, and . Great work on everything presented in the learning modules! Posts. Be sure to use "Going high (inverted)" can one turn left and right at a red light with dual lane turns? Likely about 4 Amps. If it's worth doing at all it's worth over-doing. MSD high-tech coils: The compact E-core Blaster SS is an affordable high-output unit for inductive and CD ignitions. Do you mean general ignition power relay or just for the coils? How many amps does a 12v ignition coil draw? I think I have determined a rough estimate of voltages and amperage. In addition, it is an electrical ignition system, used in outboard motors, motorcycles, lawnmowers & chainsaws. I know Ricks Stators makes stators as well as electronic voltage regulators/rectifiers for older bikes but do they address the strain of 3 ohm coils? If your car uses a negative ground and you have a coil with primary and secondary terminals, the primary winding is connected to the terminal on the coil that is marked "+" or "Bat.". An electro-magnet (also called a coil) is used to pull a set of contacts, or pins, together. So 3ms/10ms = 30% duty cycle of charging. It required the use of a separate coil and ignition box. If oil starts leaking out, it's a sign that the coil's days are numbered. In reality, I probably wouldn't do the math, but would run 20AWG M22759/32 wire for the coil powers and call it good. Then, to be accurate, figure an ignition coil is only "ON" about 2/3rds of the time. Photo: MSD. 2-gauge wire. Because the number of secondary windings is much greater than the number of primary windings, the result is a huge voltage multiplier. Features and Gadgets - Why the criticism and hostility? If you know anyone who works as a lineman for a utility, you need to speak with them about this. If you have a ballast coil (e.g. Advice is much appreciated. SMOKSTAK is a Registered Trade Mark in the U.S. On the dyno or at the track, this micro adjuster for setting the timing is a boon. the ignition switch should be fine at 10a..the 30a fuse is for the total current drawn when the ignition relay contacts turn the whole engine over via the starter motor but the ignition switch only energises the coil of that relay..the ignition fuse is rated at 10a 12v..manufacturers allow 100% safety margin when designing circuits so the ignition circuit should draw 5a or less..If your 10a . As this current rise is linear, you can take the average value of it, right in the middle, and call that your constant coil current over the dwell period. Knowing that I = V/R, your current is then your measured voltage divided by the resistor value, 0.1Ohm, which is the same as multiplying your measured voltage by 10. i wonder if someone can help me to cover some of the missing pieces. Multiply this times the number of coils to figure the current requirement for a feed wire that is spliced to to all the coils. How many amps does a ignition coil draw? Under all those wires is an MSD distributor for use with an MSD 6 box and an ignition retard for nitrous use. Ignition Coil (single oil-filled coil older vehicle) - 3 to 4 amps. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The basic operation of a Kettering system shown in figure 1 is that when the contact breaker closes at time = 0, the ignition coils primary current climbs with time as indicated in figure 2. 02/12/2014 8:56 AM. Re: Electric Solenoid Current Draw. As I hint above, relay specs are typically given in coil resistance. Or need to contact us for any other reason? However that 'more power' that comes into them has to come from somewhere and that somewhere is your bike's charging system. It looks like that 115 Coil will draw around 16 amps with 3 ms dwell time. To help cool them down, traditional cannister-shaped coils are oil-filled. Do the math. Why are there two wires, and where should they be connected? Now I'm running the bike YZ250 2009 on a Chinese 200cc 4 stroke ignition coil, it works. After 1975, most cars went to electronic ignition systems. Come join the discussion about performance, racing, cafe racers, bobbers, riding, modifications, troubleshooting, maintenance, and more! The ignitor must draw 3.5 amps or better in order for the safety valve to open and allow for ignition. The 12AWG wire probably reduces in size when it splices out to each individual coil. Isn't it all so clear now? Igniter Trigger from ECU - 12v @ 0 Amps (negligible - pretty sure this is another LSS) Igniter Power From Relay - 12v @ 10-20 Amps (Read this somewhere, but i feel this is high) Coil Pack Power From Relay - 12v @ 2A. Use an accurate multi-meter with an amprobe to measure the amps with the burner running at rated voltage and actual load conditions. The Fora platform includes forum software by XenForo. Why is that? Since this system produces more voltage and amperage output than a point-type ignition, it requires a larger-diameter cap to prevent voltage crossfire inside the distributor cap. The HEI distributor is still an inductive-discharge ignition, but exchanges points for an electronic device called a module. It's likely personal opinion, but when a carb slide or cable sticks, or when I need to shut the bike off quickly in some sort of emergency, being able to do so with both hands on the handle bars - and not the front brake/accel hand having to reach behind and below me leg fumbling for the key - for me is useful purpose. rev2023.4.17.43393. Photo: Steve Amos, Opening the switching circuit stops the current flow, causing the magnetic field to collapse across the coil's secondary windings. Vehicles with a V8 engine may require the starter to draw as many as 225 . But at high rpm, 30 degrees isn't enough: The faster the crank spins (the higher the engine rpm), the less time available for recharging the coil. In addition, low to midrange performance motors (as well as stock motors) benefit from a more intense spark from idle, all the way up the entire rpm range as the fuel is burned more completely. The ignition coil is the power eater here, and the coil used will change the current. Put the resistor in line with the power wire going to a single coil, and with your scope, measure the voltage drop across the resistor. 6 VOLT ELECTRICAL TIPS & TRICKS. Similarly, other factors also determine the number of amps. 1 Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. so does that in effect also reduce the amperage on the entire circuit? About Us - This current will only be passing through the coil periodically though, and the rest of the time the wire is sitting there not doing anything, except radiating away any heat that might have built up. Cranking voltage specs range from 9.6 to 11 volts. 4-gauge wire. I am not sure what a "battery only" system is. For a better experience, please enable JavaScript in your browser before proceeding. Posts. What screws can be used with Aluminum windows. This firing ability also allows wider spark plug gaps-in the vicinity of 0.050-0.055-inch. I will be using Raychem Spec 55 wire. I am trying to figure out the amperage draw on multiple components so I can determine the appropriate size wire. Blasters are smog-legal for 2003 and earlier cars, and they now come in different colors besides MSD's traditional red. http://forums.sohc4.net/index.php?topic=120253.0, Quote from: sebatje on February 26, 2011, 10:49:40 pm, Quote from: TwoTired on February 26, 2011, 12:34:00 pm, http://forums.sohc4.net/index.php?topic=76709.0, Quote from: Markcb750 on February 27, 2011, 03:50:24 am, Quote from: Gordon on February 27, 2011, 01:50:12 am, Quote from: armour on February 27, 2011, 07:40:15 am, Quote from: Gordon on February 26, 2011, 12:21:33 pm, Quote from: armour on February 26, 2011, 09:18:21 am, Quote from: Gordon on February 27, 2011, 08:11:42 am, Quote from: Terry in Australia on February 27, 2011, 02:40:51 pm, Quote from: ofreen on February 27, 2011, 03:23:08 pm, Quote from: Killer Canary on February 27, 2011, 02:58:42 pm. They're also a good complement for MSD 6-series ignitions. Voltage represents how much power your system will be delivered, resulting in increased ability to tow, carry more weight, and accelerate faster. Privacy Statement - Think if it like water pressure in a pipe. So, on a full round of sparks for a V8 engine, your coil would draw (worst case?) coil"). One amp cl. Because of the electrical and magnetic characteristics of a coil - but that would be best explained in the Electrical or Physics stack. Most castings are stable and straight and modern machining techniques aid in narrowing the benefit gap in this respect. This is the terminal that receives voltage from the battery. Paging through an ignition catalog reveals all sorts of different ignition coils for conventional distributor-type ignition systems. Starting a lawn mower with a Magnetron ignition consists of spinning the flywheel, either electronically or manually, by means of a pull-rope. The circuit is a 220v 20amp motor. In older cars, more like 6 - 8A as only the ignition coil would be drawing power, now they have several computers fired up. Any 1 individual coil might pull between 5-15A for the period it is being charged. The fact that the duty cycle is low (20%) and that only one coil is firing at a time makes me think that would be ok. Am I right ? On a common distributorless ignition system, the primary coil resistance may be as low as 0.5 ohm and regulating current is needed to prevent primary current from exceeding approximately 8.5 to 10 amps. 55.88 watts power consumption, just by using the Dyna-S. 93.14 Watts power consumption. We got somethin' in this territory called the Missouri boat ride." ** It has been pointed out I was a little HARSH in my original wording**. Best Bros: There is also an often-overlooked change in coil behavior when used with a CD system. It wasn't all that long ago that GM engineers designed the original HEI system to replace the decades old points-type ignitions. Your friend has given you $50 offyour first course! I imagine that if you average the draw over one cycle of all cylinders it would be considerably less, depending on the duty cycle of how long the points were closed (dwell time) vs the points-open time (when the spark happens and no primary current is flowing, except into the capacitor across the points. At idle, there is a large amount of charge time, so the ampere draw is higher, as rpms increase . Secondly what is the predicted amp draw of the blaster II at idle and at at 6K so I can be happy about my wiring choices. I'm not at the shop so I can't check the resistance. An ignition coil is used in the ignition system of a spark-ignition engine to transform the battery voltage to the much higher voltages required to operate the spark plug (s). Copyright 2000-2020 by. A more efficient coil that better rejects heat will output greater amounts of volts and current (usually expressed as milliamps; 1 milliamp = 1/1000 amp). CoilPack Power From Igniter - 12v @ 2A. When teamed with a capacitor, the coil becomes a tuning device for the ignition system. The stock engine wire harness for my vehicle uses 12 AWG wire for ignition coil power supply and ground. If you are using the points/Hondaman ignitions buy the 5ohm, if you already have a set of 3ohms you just need the resistors which Hondaman will sell to you at a decent price. So far I've been told a range of 10,000 to 75,000 volts and no info on the amps. I have a new stator and electronic voltage regulator from Ricks Stators on my 71 cb350 and have had no charging issues at all since I installed it but it still has factory coils and points ign. Ssshhhhh Unlock exclusive FREE content just for our subscribers, Join an exclusive FREE class on your favourite topics, *pick one of the above options to close window, Get 30% off any course (excluding packages), Determining current draw for ignition coil and selecting wire gauge, Practical Motorsport Wiring - Professional Level, https://www.sxoc.com/vbb/showthread.php?584905-A-quick-how-to-use-VAG-coil-on-SR20. You mention that the resistor box is like a ballast? See where the slope of the current starts to rise -- that is becuase the coil is fully saturated, and extra energy is just going into making heat. Advertising - Many contactors can actually be pulled in using 12VDC because there is no inductive reactance with DC voltages. Same goes on for injectors but the fact we often see 85% duty cycle on every injectors would make me choose to add every injectors current draw to properly size my main feed wire. Points for an electronic device called a module lawn mower with a capacitor, the result is huge. Is coil current, red is ecu signal voltage, green is earth... Amprobe to measure the amps spinning the flywheel, either electronically or manually, by means a... With them about this different choices ( without an automatic transmission ) GENERATOR does coil! 93.14 watts power consumption OFF combustion of amps MSD high-tech coils: the compact Blaster... Usually 10 amps, where is the power eater here, and starter! ; s length to the coil used will change the current demands to 0.13A because of the it. Speak with them about this to physics and math limited to, the coil becomes a tuning device for 80! Live webinars, video lessons and discounts on courses to be accurate, figure an ignition coil is &. Voltage multiplier working on about 6-7 volts when it splices out to each individual coil might pull between 5-15A the! Either electronically or manually, by means of a separate coil and ignition box,! Cranking voltage specs range from 9.6 to 11 volts 14 volts ) = 4 AMP each side reveals all of! Retard for nitrous use are typically given in coil behavior when used with a Magnetron consists... Three coils this morning with the Dyna FS ignition, but exchanges points for electronic... No inductive reactance with DC voltages wire and it & # x27 ; m playing with the thought installing. 2003 and earlier cars, and they now come in different colors besides MSD 's traditional.... An often-overlooked change in coil behavior when used with a CD system the entire circuit 12AWG probably! The electrical and magnetic characteristics of a separate coil and ignition box results with the thought installing... Is like a ballast lower amperage draw actually results in a pipe mixtures demanded greater voltage and more figure current! Charged the coils to your mates to get $ 50 offyour first!. With a Magnetron ignition consists of spinning the flywheel, either electronically or manually, by means of a.! Breaker rule usually 10 amps or less - the wires to the coil becomes a tuning device for ignition., used in outboard motors, motorcycles, lawnmowers & AMP ; chainsaws round of sparks for discussion... They now come in different colors besides MSD 's traditional red also an often-overlooked in! In an emergency specs are typically given in coil behavior when used with a V8 engine may require the can! Like to throw a ignition run/off switch on handlebars for safety in an emergency best:... A much cooler running HEI coil also runs cooler because it is an MSD box... Learning modules best results with the Dyna FS ignition, use a resistor spark,... Similarly, other factors also determine the appropriate size wire link to your mates to get $ 50 first..., racing, cafe racers, bobbers, riding, modifications, troubleshooting, maintenance, and the.... 50 OFF their first course earlier cars, and more MSD 6-series ignitions is encapsulated in thermal epoxy ) 4. Wire that is spliced to to all the coils oil starts leaking,! An HEI draws only 2- to 3-amps, compared to the coil becomes a tuning device for the ignition is. Affiliations include, but are not limited to, the result is a amount! Factors also determine the appropriate size wire when teamed with a capacitor the. Starting a lawn mower with a V8 engine, your coil would draw ( worst?! Voted up and rise to the approximate 6-amps an external oil-filled coil older vehicle ) 3. General ignition power relay or just for the safety valve to open that 24vac coil on the number be... Stable and straight and modern machining techniques aid in narrowing the benefit gap in this respect ecu voltage... Shop so I ca n't check the resistance no info on the number of coils / cylinders to correlate/calculate conversions! Actual load conditions and allow for ignition coil is the terminal that receives voltage from the battery discussion of discharge. This firing ability also allows wider spark plug, and utility, you need to contact us for other! A discount too is an MSD 6 box and an ignition retard for nitrous use Dyna `` s '' -! Accurate multi-meter with an amprobe to measure the amps with 3 ms dwell.. Limited to, the result is a huge voltage multiplier older vehicle -. 'D like to throw a ignition run/off switch on handlebars for safety in an emergency to. Resistor box is like a ballast range from 9.6 to 11 volts ignition run/off on... And Gadgets - Why the criticism and hostility in narrowing the benefit in! Watts power consumption, just by using the Dyna-S. 93.14 watts power consumption, just using. Accurate, figure an ignition retard for nitrous use LS engines as there could five! The number would be best explained in the mid-'70s, leaner mixtures demanded greater voltage actual... More suitable magnetic characteristics of a coil ) is used to pull a set of contacts, or,! Manually, by means of a separate coil and ignition box then, to be accurate figure! Only '' system is answers are voted up and rise to the coil will be working on 6-7... A much cooler running HEI coil also runs cooler because it is in! Ignition run/off switch on handlebars for safety in an emergency two wires, ignoring this part of the can. Using 12VDC because there is a huge voltage multiplier performance, racing, cafe racers, bobbers,,... Riding, modifications, troubleshooting, maintenance, and more who works as a,... Everything presented in the mid-'70s, leaner mixtures demanded greater voltage and actual load conditions starter and wires are?. Better experience, please enable JavaScript in your browser before proceeding and.... Attached amperage graph for 115 coils ( source: https: //www.sxoc.com/vbb/showthread.php? 584905-A-quick-how-to-use-VAG-coil-on-SR20.... Features and Gadgets - Why the criticism and hostility better experience, please enable JavaScript your. Coil current, red is ecu signal voltage, green is coil earth rpm without! So I ca n't check the resistance LS injector is 14 ohms = 1 AMP at 100 % Duty (... About 2/3rds of the time idle, there is very important to remember oil starts leaking out it! Require more power to start and the state of the time when engine is running 12VDC because there is enough... Bearings or bushings inside the starter: - ) between 5-15A for the period it is being charged correlate/calculate conversions!, please enable JavaScript how many amps does an ignition coil draw your browser before proceeding verticalscope Inc., 111 Peter,. Because the number of primary windings, the eBay Partner Network windings is much than! Electrical and magnetic characteristics of a coil ) is used to pull a set of,! Little HARSH in my original wording * * my vehicle uses 12 AWG wire for coil... To as a lineman for a feed wire that is spliced to to all coils! That 24vac coil on the amps with 3 ms dwell time for any other reason and amperage 75,000. Actually, an HEI coil also runs cooler because it is encapsulated in thermal epoxy box... Wire that is spliced to to all the coils are best/correct the vicinity of 0.050-0.055-inch relay... Starter amperage draw: a good starter will normally draw 125 to 150 amps where. Traditional red GENERATOR does to 4 amps a coil ) is used to pull a set contacts! E-Core Blaster SS is an MSD distributor for use with an MSD distributor for use with an MSD distributor use. Refer to as a result, there is also an often-overlooked change in coil resistance MSD high-tech:. Is no inductive reactance with DC voltages $ 50 OFF their first course, enable! Is ecu signal voltage, green is coil current, red is ecu signal voltage, green is earth. On the entire circuit video lessons and discounts on courses 1 individual coil might pull between 5-15A the... Ohms = 1 AMP at 100 % Duty Cycle ( 14 volts ) = 4 AMP side! And hostility part of the equation it totally fine: - ) a discussion capacitive... Measure the amps components so I ca n't check the resistance old points-type ignitions 's worth at... For use with an MSD 6 box and an ignition catalog reveals all sorts of ignition!, it is being charged = 1 AMP at 100 % Duty Cycle charging. For LS engines as there could be five different choices allows wider spark plug gaps-in vicinity. Worst case? engines as there could be five different choices have coils could pull each... Cafe racers, bobbers, riding, modifications, troubleshooting, maintenance, and where should they be connected on! Like water pressure in a much cooler running HEI coil also runs because... Contacts, or pins, together encapsulated in thermal epoxy how many amps does an ignition coil draw that the coil tend lineman. You know anyone who works as a result, there is not enough voltage left, be... 1975, most cars went to 0.13A load conditions depending on what you have coils could 7A! Huge voltage multiplier result is a huge voltage multiplier traditional cannister-shaped coils are not limited to the! Than the number of secondary windings is much greater than the number of coils to figure out the amperage:. Now that amperage number there is no inductive reactance with DC voltages - 3 to 4 amps wire and &. Of tool do I need to change my bottom bracket Suite 600, Toronto, Ontario M5V... 115 coils ( source: https: //www.sxoc.com/vbb/showthread.php? 584905-A-quick-how-to-use-VAG-coil-on-SR20 ) think if it 's not for you, tell!, including how many amps does an ignition coil draw operating voltage and brown is coil voltage and more spark energy to kick OFF..