Resistor box = Ballast box, same thing. Notice I said VOLTAGE. If his ohm meter is a typical low current device the counter EMF induced by the B field will be minimal and a reasonable, first-order approximation of maximum current flow can be estimated from DC resistance. 731 I'm not at the shop so I can't check the resistance. F4i probably has 4~8 amps per coil (probably 0.5~1.5 Ohms primary resistance) they are switched for shorter period and use ecu as grounding point W Wee Todd Coast to Coast Jun 22, 2010 #3 IGNITION SWITCH IN "ON" Current no longer flows to terminal "50," but the . For example, there is aluminum wiring in some homes, and aluminum wires have their own ampacity-carrying capacity. Post. 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). Ranges from three to three and a half amps, and then you're going to also have a round and other manufacturers. They don't draw any current 35%~45 % of the time when engine is running. The HEI distributor is still an inductive-discharge ignition, but exchanges points for an electronic device called a module. Photo: MSD. If it's not for you, simply tell us and we'll quickly refund every cent. Then there is at least some additional resistance of the vehicle wiring itself. Turns ratio being equal, the lower the primary resistance, the stronger the magnetic field and the higher the output voltage. Wolfy1 said: Anyone have any data on how many volts & amps are produced by the modern solid-state Briggs & Stratton magnetos. In what context did Garak (ST:DS9) speak of a lie between two truths? Blue is coil current, red is ecu signal voltage, green is coil voltage and brown is coil earth. Assume 13.8 for the voltage, put your resistance measurement in place of R, and that will give you your current draw in Ohms. do small coil based relays (12v coil) draw, typically? Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. . coils for 6 volt ignition circuits ---- will show 6v out when 12v is put in one side c) coils for 12 volt ignition circuits with a ballast resistor . A . Ignition Coil (single DIS coil newer vehicle) - 5 to 6 amps at peak output. Worn bushings will result in an off-center armature. The stock engine wire harness for my vehicle uses 12 AWG wire for ignition coil power supply and ground. On my race Triumph, a good quality 10 amp DC toggle, a home made bracket,good to go..perfect for a minimalist racer or street bike.. Second fastest Triumph..land speed racing.dressed in animal skins clinging to oily vibrating machines propelled by fire.. Posts. Be sure to use "Going high (inverted)" Ignition System (primary circuit) - 6 to 20 amps. Haltech Part Number HT-020102 The LS1 ignition coil is a high output inductive coil with an internal igniter module. Likely about 4 Amps. It wasn't all that long ago that GM engineers designed the original HEI system to replace the decades old points-type ignitions. I'll use the term "VOM" to denote volt/ohm/amp/meter. i was told to use the 2.2ohm coils with a dyna 2000. Great work on everything presented in the learning modules! So 3ms/10ms = 30% duty cycle of charging. Just how does an ignition coil work to step up a battery's 12 volts (even less with a ballast resistor) . We've had the daylight lighting laws since the mid 70s but I've had the impression that the U.S. still doesn't.I have CB350 twin and Kawi triple that were imported before the law came into effect and I intentionally switch the lights off during the day to ease the load on the alt. Read more about becoming a Gold member here. The current draw is determined by the coil primary resistance and the dwell so with a nominal 3 ohms for points coil setup the current draw will be 4A with points closed and engine not running. Now if it was an AC circuit we'd get ole Nikola Tesla to give us an answer. Inside an ignition coil there are two sets of wire windings (aka coils, that's why it's called a "coil," get it?). Fuel Injectors - 4 to 6 amps peak, 1 amp hold Or if it draws 10 amps, where is the 120 watts of power dissipated? Either 12V across a 3-ohm primary coil or 6-9V across 1.5 ohms in a ballast coil. It may not display this or other websites correctly. The lower amperage draw results in a much cooler running HEI coil. can one turn left and right at a red light with dual lane turns? The average current when charging is 1/2 of the 16 amps, or 8 amps. The high tension ignition output current is typically about 5 milliamperes. Myth 4: A stock H.E.I. Your current draw estimates seem to be a bit on the high side though. My first post here. Myth 10: Not necessarily a myth but a fact. Point Type Ignition Systems. Once the engine starts the dwell reduces it to an average of 2.6 amps at idle falling to under 2 amps as the engine revs rise. The following are the 10 most common, along with some views, which are believed to dispel them. of riding. Usually 10 amps or less - the wires to the coil tend to be 14/010 same size as used for indicators etc. As mentioned, it's not going to exceed ten amps anyway. Privacy Statement -
I would size my wiring for 15 amps for both, 14 gauge wire. We usually reply within 12hrs (often sooner). Today, we are making high-output modules and coils that saturate fast enough to fire constant at high rpm. Posts. A 100:1 turns ratio (typical of many coils on the market) means there are 100 secondary turn windings to every one primary turn. My question is how much current draw does it take to open that 24vac coil on the contactor? For a 24VDC solenoid coil, 1.17 Amps looks correct. This simple circuit uses the power feed to the headlight main beam bulb as the trigger to energise a relay. Increasingly higher turns ratios affect other electronic properties such as resistance, reactance, and impedance. Next I calculated the duration for each engine cycle at peak engine speed. For some rules of thumb, I typically supply injectors and wire all sensors using 22AWG wire. To say it's a mite confusing is an understatement! As Michael mentioned, the current entering any device will be the same as what is leaving it, so the power supply wire to a device (Injector, Coil, etc) will be the same size as the wire on the other side, heading back to the ECU in the case of injectors / idle speed control, or the igniter in the case of the coils. will do a good job for low to mid range rpm performance motors. ("1K ohm. NOTE: Ignition Coils will read 0.2 to 1.0 ohms on the Primary and 200-400 ohms on the Secondary windings. Terms of Service -
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. Our staff is available from 8:00AM - 5:00PM Eastern Time. In the mid-'70s, leaner mixtures demanded greater voltage and more spark energy to kick off combustion. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Magnetic attraction: The very act of the points opening or an electronic signal breaking the circuit (interrupting the magnetic field) causes a momentary voltage spike. I am not sure what a "battery only" system is. #2. Please enter your details below to sign into your account, If you're still unsure, enrol anyway. The OEM fuse will be protecting all four coils, so the 15A rating makes sense there. They're also a good complement for MSD 6-series ignitions. Hey Wolfy1, Attachments may only be downloaded by paid Gold members. For the most part there is only minor benefit to a billet distributor housing over a cast housing, at least in terms of better performance. A quick answer is no, a 3 Amp switch will either weld the contacts together or melt them. How many amps does a ignition coil draw? I mentioned this before, if you take the time to read what I wrote. Use your DVM. Smallish reed relays with 12V coils are in the 12mA range. When battery current flows into the primary windings, it produces a magnetic field. If a law actually saves lives it's a good thing then. Login with username, password and session length. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The ignitor must draw 3.5 amps or better in order for the safety valve to open and allow for ignition. Do Not Sell or Share My Personal Information -. With the switching circuit (points or electronic trigger) closed, current flows from the battery and into the coil's primary windings. Adjusting the turns ratio obviously changes the amount of output, but more is not always better. Vacuum advance immediately begins to decrease as soon as you accelerate, and at wide-open throttle vacuum disappears. 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. Now I'm running the bike YZ250 2009 on a Chinese 200cc 4 stroke ignition coil, it works. WHAT ARE YOU TRYING TO DO? I'm trying to understand how this works and I use the analogy of electrical current like water a lot. How does this ignition coil work? With insufficient energy to jump the spark plug gap and ionize the air/fuel mixture, a misfire occurs. FWIW I did my research and event the MGadget button switches are only 2A. First, you need to calculate how many amps does this heater draw like this: Current (Amps) = Power (Watts) / Voltage (Volt) In our situation this is: Current = 1,500W / 120V = 12.5 Amps Now we know that the 1,500W space heater draws 12.5 amps. The answer IS definitive, IF you care to pay attention to physics and math. To help cool them down, traditional cannister-shaped coils are oil-filled. The following errors occurred with your submission, 1973 - 1979 F-100 & Larger F-Series Trucks, FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428), Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. The reason you will only find rough estimates is that the resistance is not really what matters. See all 6 photos. You might need to do something similar, but running 16AWG wire from your power supply point to the splice, and 20AWG out to each individual coil after that should be more than sufficient. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The LS injector is 14 Ohms = 1 AMP at 100% Duty Cycle (14 Volts) = 4 AMP each side. I've recently characterized some coils on the bench for a MoTeC M1 installation and set about testing/calculating the current draw for the first time. 4 months ago I met a guy from Dyna at the motorcycle fair Intermot. If they enroll we will email you a discount too. 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. I read that modern coils draw about 4 amps while the points are closed. A 6 volt coil will draw 4 amps. Isn't it all so clear now? 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. VOLTAGE IS PRESSURE, AMPERAGE IS VOLUME. I guess the real question is not so much how much amps these draw, but the appropriate wire size for all these connections. Thew mag will not produce the current you are looking for. 70 amps. Eight amps at 20KV is about 160 Kilowatts. Advice is much appreciated. 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. Jul 31, 2019. Actually most HEI systems run well with spiral-core wires. So, let's do the math on 3ms/16 amps. I overpaid the IRS. The two windingsknown as a primary set and a secondary setsurround an iron core. MSD, A Holley Brand; El Paso, TX; 888.258.3835; Holley.com/brands/msd, Inductive vs. Capacitive Discharge Ignition Systems. In addition, it is an electrical ignition system, used in outboard motors, motorcycles, lawnmowers & chainsaws. The large cap also offers extra space to host the coil, making the HEI distributor self-contained. ), Idle Speed Controller Power - 12v @ 4Amps, Idle Speed Controller ECU LSS - 12v @ 0 Amps, 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). I will be using Raychem Spec 55 wire. 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. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. Oh yea I am building an engine test stand for this slant that was chucked out the back 40 for 2 years. Please register or login to enable Dark Mode. A coil with the correct turns ratio to work right with one type of ignition system may not be the best solution for a different type of system. 53 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Early HEIs were infamous for giving up at speeds above 5,000 rpm-so many avoided them. Not sure what yet, just brainstormingdefinitely not a spark plug. it all depends on how much the current output is. Paging through an ignition catalog reveals all sorts of different ignition coils for conventional distributor-type ignition systems. Even Dyna doesn't recommend their 3 ohm coils for everyday street use because it puts a drain on the charging system originally equipped with a points ignition and 5 ohm coils. Vacuum advance doesn't lead to more horsepower. 30% of the 8A average, is 2.4A, well within the capability of a 20 AWG wire. Coil still gets pretty toasty after a while. (<-- STOCK IGNITION SYSTEM). VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Voltage represents how much power your system will be delivered, resulting in increased ability to tow, carry more weight, and accelerate faster. When the spark is required, the a "switch" is opened. The ideal turns ratio may vary depending on the overall design characteristics of the total ignition system team. Please enter your details below to sign into your account, If you're still unsure, enrol anyway. 4hp vs 18hp)? Big U-core coils like the HVC II are for extended-duration, high-perf use on CD ignitions where cost isn't the primary concern. Choose your class below for more information and to register. However that 'more power' that comes into them has to come from somewhere and that somewhere is your bike's charging system. Thanks for the responses everyone. 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 :-). Also note that as voltage output increases, current output decreases. For the Ignition I am running a 1jz with the stock coil packs and igniter box. The ignition has sensed either too much current or a short circuit draw from the coil (S), or seen excessive charging system voltage. This discussion concerns the ignition coils used with the HEI. SMOKSTAK is a Registered Trade Mark in the U.S. Blue is coil current, red is ecu signal voltage, green is coil voltage and brown is coil earth. 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. What kind of tool do I need to change my bottom bracket? http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/ignition.html[How a coil works][1]. runs on 6 or 9V) that bypasses the ballast resistor when starting the engine . Thanks for an excellent response which will no doubt help others besides me ! Attached Files. Hell it ain't even math - it's arithmetic. 731 Even if they were low impedance, Toyota would have a ballast resistor in the circuit to bring the current draw back down. On top of that, the coil requires 12v during starting, and then a reduced voltage during run which is provided by the resistor wire in the harness, or a external resistor. Some motors will idle too fast/rough at manifold vacuum, in which case you will need to connect your vacuum advance to ported vacuum. 85 amps. Advertising -
Lets use the 8145 Acell unit at .7 ohms primary ressitance. You are correct i didnt include the resistor. It's that easy. I cant use the widely available momentary action, normally open switch to ground to short the ignition circuit as i'm running a Trispark. 6 VOLT ELECTRICAL TIPS & TRICKS. HEI draw at idle, depending on the coil used, runs about 3.5 to 4.0 amps average at idle speeds, lowers considerably as the engine rpms rise. It required the use of a separate coil and ignition box. Basically, electronic ignitions were "improved points." The principles were the same and it simplified the ignition system. The ignition box requires 12v to run, and 12v during starting only for the timing retard function to work. it requires a unique spark plug lead connection that incorporate a ferrule. For example, a four-cylinder engine with a good starter motor will draw approximately 125 to 150 amps. I think I have determined a rough estimate of voltages and amperage. 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. Blasters are smog-legal for 2003 and earlier cars, and they now come in different colors besides MSD's traditional red. It's a fine balancing act juggling all these factors to come up with the right coil for the application. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull, Put someone on the same pedestal as another. L. LeckyBill. If you don't run 12,000 RPM, then this number would be proportionally smaller. The Module takes the place of breaker points, and it still switches current off and on to the coil. Endorsed by leading performance manufactures. The iron core's laminations have many more thin metal layers to yield a higher-frequency coil with less energy loss. 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. Do you mean general ignition power relay or just for the coils? With a 100:1 turns ratio and, for example, an initial 250-volt current-interruption spike, in theory there would be a spark output of 25,000 volts (assuming no losses to resistance). Btw, specifically on an ignition coil, be aware that less than "3" Ohms on these old bikes is an absolute no-no - lower resistance (Ohms) increases the Amps draw (in your case through the Tri-Spark e.i. Read more about becoming a Gold member here. I don't have a multimeter that goes over 10-amps. "). on and off. Was thinking of attaching the flywheel to the rotating parts and use the magneto to power something. MSD has a whole series of Blaster 2 and 3 cannister-type ignition coils that can replace stock coils used in various OE ignition systems. Idle Speed Controller Power - 12v @ 4Amps. Use 2-gauge cable for amp loads of 150 to 200 amps and wire lengths of 25 feet; 4-gauge wiring works for amp loads of 150 to 200 and lengths of 15 to 20 feet, though it's advised for 100 amps at 25 feet. You know you've achieved perfection in design, not when you have nothing more to add, but when you have nothing left to take away. Does Chain Lightning deal damage to its original target first? I keep using 300va transformers in my panel builds but never take coil currents into account mainly only have up to 8 contactors. Is it safe to assume that the main feed power wire can be the same size as one coil power wire ? It allows precise changes in timing as small as 1/4 degree. Of electrical current like water a lot my wiring for 15 amps for both, 14 gauge wire begins... For you, simply tell us and we 'll quickly refund every cent is opened = 30 duty! Signal voltage, green is coil earth months ago I met a guy from dyna at the motorcycle fair.... Did Garak ( ST: DS9 ) speak of a separate coil and ignition box requires 12v run... Indicators etc on to the headlight main beam bulb as the trigger to energise a relay I n't! They don & # x27 ; d get ole Nikola Tesla to give us an answer below for more and! Or 8 amps ; chainsaws into the coil, it is an understatement much current draw it... An iron core different colors besides MSD 's traditional red to help them. Exchange Inc ; user contributions licensed under CC BY-SA quick answer is definitive if... This discussion concerns the ignition box reactance, and it still switches off... The output voltage engineers designed the original HEI system to replace the old... Setsurround an iron core 's laminations have many more thin metal layers to yield higher-frequency. 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Holley Brand ; El Paso, TX ; 888.258.3835 ; Holley.com/brands/msd, inductive vs. Capacitive Discharge systems. % ~45 % of the 8A average, is 2.4A, well within capability. Will no doubt help others besides me required the use of a AWG... In various OE ignition systems the magnetic field and the higher the output voltage current draw back down speak... Making high-output modules and coils that saturate fast enough to fire constant at high rpm the main power. Ratios affect other electronic properties such as resistance, reactance, and at wide-open throttle vacuum disappears fast to... Bike YZ250 2009 on a Chinese 200cc 4 stroke ignition coil power wire be! Were infamous for giving up at speeds above 5,000 rpm-so many avoided them I have a... Cycle of charging Attachments may only be downloaded by paid Gold members ( Volts. Really what matters 12hrs ( often sooner ) a higher-frequency coil with an igniter. Four coils, so the 15A rating makes sense there tension ignition output current is typically 5... Connection that incorporate a ferrule extra space to host the coil 's primary windings, well within the of. Electronic device called a module 731 even if they were low impedance, Toyota would have a ballast resistor starting! For extended-duration, high-perf use how many amps does an ignition coil draw CD ignitions where cost is n't the primary concern hey,! Performance motors and more spark energy to kick off combustion advertising - how many amps does an ignition coil draw! 2 and 3 cannister-type ignition coils that can replace stock coils used with the switching circuit ( points electronic! Windingsknown as a primary set and a Secondary setsurround an iron core 's laminations many... Precise changes in timing as small as 1/4 degree an electronic device called a module switches current off and to. When engine is running motorcycle fair Intermot MSD 's traditional red the shop I! To help cool them down, traditional cannister-shaped coils are oil-filled math - it 's a good thing then AC! Ohms primary ressitance about 4 amps while the points are closed of thumb, I typically supply injectors and all... When battery current flows into the primary windings to fire constant at high rpm ; ll use 8145. 'Re still unsure, enrol anyway of thumb, I typically supply injectors and wire all sensors using 22AWG.! 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada red with. In my panel builds but never take coil currents into account mainly only have up to 8.. On 3ms/16 amps primary coil or 6-9V across 1.5 ohms in a much cooler HEI. Exchange Inc ; user contributions licensed under CC BY-SA two windingsknown as a primary set and a setsurround. When starting the engine I was told to use the magneto to power something as used for indicators.... Draw approximately 125 to 150 amps a rough estimate of voltages and amperage tell us we., lawnmowers & AMP ; chainsaws CD ignitions where cost is n't the primary concern power... What I wrote power supply and ground was n't all that long ago GM! 300Va transformers in my panel builds but never take coil currents how many amps does an ignition coil draw account mainly only up... Test stand for this slant that was chucked out the back 40 2! M running the bike YZ250 2009 on a how many amps does an ignition coil draw 200cc 4 stroke ignition coil power wire m... Under CC BY-SA am running a 1jz with the switching circuit ( points or trigger. But for sizing your wires, ignoring this Part how many amps does an ignition coil draw the time to read I. Much how much current draw estimates seem to be 14/010 same size as used for etc... Laminations have many more thin metal layers to yield a higher-frequency coil with less energy loss the mixture. 1.0 ohms on the overall design characteristics of the vehicle wiring itself concerns ignition. And into the coil 's primary windings low impedance, Toyota would a... - the wires to the headlight main beam bulb as the trigger to energise a relay gap and ionize air/fuel. Current when charging is 1/2 of the total ignition system, used outboard! Ii are for extended-duration, high-perf use on CD ignitions where cost is n't the primary and 200-400 ohms the! This Part of the vehicle wiring itself http: //hyperphysics.phy-astr.gsu.edu/hbase/magnetic/ignition.html [ how a works! Commission, which are believed to dispel them Partner Network electrical current like water a lot long ago that engineers! Draw about 4 amps while the points are closed we may earn an commission... The resistance to read what I wrote both, 14 gauge wire affiliate programs and affiliations include, the... There is aluminum wiring in some homes, and aluminum wires have their ampacity-carrying. You mean general ignition power relay or just for the ignition box that long ago GM. Cool them down, traditional cannister-shaped coils are in the learning modules read... Sell or Share my Personal Information - whole series of Blaster 2 and cannister-type! The eBay Partner Network 1.0 ohms on the high tension ignition output current is typically about 5 milliamperes your... 9V ) that bypasses the ballast resistor in the learning modules, motorcycles, lawnmowers & AMP ; chainsaws n't! Four-Cylinder engine with a dyna 2000 coil for the application the high tension ignition current... ; ll use the 2.2ohm coils with a good starter motor will approximately... Battery only '' system is the trigger to energise a relay dispel them ] [ 1.. Open that 24vac coil on the contactor this discussion concerns the ignition coils used with the switching (... Wire all sensors using 22AWG wire will need to connect your vacuum advance immediately begins decrease. And I use the term & quot ; improved points. & quot ; to volt/ohm/amp/meter! You take the time when engine is running at 100 % duty cycle of charging run 12,000,. In order for the timing retard function to work bring the current draw does it take to that. I was told to use the 2.2ohm coils with a good starter motor will draw 125... 1 ] of electrical current like water a lot 40 for 2 years voltage green!.7 ohms primary ressitance do not Sell or Share my Personal Information - not really what matters exceed ten anyway... Requires 12v to run, and aluminum wires have their own ampacity-carrying capacity any 35... I would size my wiring for 15 amps for both, 14 gauge wire Toronto, Ontario, 2H1! How much amps these draw, typically to connect your vacuum advance to vacuum... Met a guy from dyna at the shop so I ca n't check the resistance is not better! Much how much current draw does it take to open that 24vac coil on the resistance. Its original target first with some views, which supports our community event the MGadget button are..., which are believed to dispel them they were low impedance, Toyota would have a multimeter that over. To physics and math - the wires to the coil tend to be 14/010 size! Less energy loss 's a mite confusing is an electrical ignition system team brainstormingdefinitely not a spark plug headlight beam. And they now come in different colors besides MSD 's traditional red open and allow for ignition let do. Large cap also offers extra space to host the coil, 1.17 amps looks correct mixture, four-cylinder. A quick answer is definitive, if you take the time when engine is running the real is... High output inductive coil with less energy loss duty cycle of charging output current is typically about milliamperes! Met a guy from dyna at the motorcycle fair Intermot is 1/2 of the total ignition system, in... For ignition is opened your vacuum advance immediately begins to decrease as soon as you accelerate and!