It also features a popular two-step rev control for staging and over rev protection. The familiar gold box has been redesigned to deliver an 40% increase in spark energy! My 565 with 14.7 to 1 comp likes .040 max width. Figure 6 Wiring to an MSD 7AL-2 Ignition Control. We normally use the stock gap and spark plugs only if the engine is mostly stock. MISCELLANEOUS INFORMATION Dick Gale was the Champion Spark Plug Racing rep for the IMSA and NASCAR races then. JavaScript is disabled. Post by groberts101 » Mon Mar 02, 2015 3:16 pm. Back in the 70’s I was IMSA racing at Daytona. Page 3 of 3 < Prev 1 2 3. Always inspect the cap and rotor to make sure they are in good condition. Always inspect the cap These instructions cover the wiring and general installation tips of all the MSD Flying Magnet Crank ... Never use solid core spark plug wires with an MSD Ignition system or crank trigger. The MSD 7AL-2 is meant to be used as a short duration use unit only. The main determining factor for gapping a spark plug is the compression ratio of the motor. Spark Plug Torque Specs. Engine is a 540 cu.in. http://www.msdignition.com/uploadedF...structions.pdf, http://www.jegs.com/i/MSD/121/8860/10002/-1, If this is your first visit, be sure to RM. It is … Even for your daily driver and street car guys, this will allow you to run a larger spark plug gap, producing more power and performance. We run a similiar setup but with SM IV's. I just seem to be stuck on .045 It works for me. From Super Stock to Comp it’s the ignition of choice for racers. Spark Plug Cross Reference Guide. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. An engine that is used in a drag racing application will be exposed to a high load during a run, so having plenty of consistent spark is required. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. Top. What do you guys & girls gap your plugs at? If the spark cannot jump the gap between the electrode and … The MSD instructions state you can go to .060" . I think that is normal for the MSD dist. 0.45 here. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! I use the same gap (and Accel #762 plugs) in my Blue Thunder 514. Opening the gap forces the coil to build up a higher voltage in order for the spark to jump the gap. Recommended Spark Plug Torque Specifications. 30° is a good (safe) starting point The 10-PLUS Coil, PN 8208, is the only coil that can be used with this ignition … ... ignition. I been setting my spark plug at .035 but I'm second guessing that it should be more. MSD 6AL Spark Plug Gap. Your compression or lack of it will help dictate where the gap needs to be... consider the HEI cars... 7.5 to 9:1 compressions. MSD Cross Reference with NGK® Stock Number to Plug Type. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). Good luck. We are also aware that using the MSD with platinum plugs may increase the chances of pinging and detonating. It is recommended to follow the engine builder’s or manufacturer’s recommendations for plug heat range and gap. Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. More voltage increases the initial ionization of the spark plug gap, but lowers the amount of current, or heat, that follows across the plug gap. It can be run on the street if the proper coil is used and if the unit gets plenty of air circulation. SPARK PLUG GAP These examples are just starting points to get you going in the right direction. http://photobucket.com/albums/d180/Bad68Nova_/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. Jim 383 stroked to 432c.i. .045 for me too. ... ↳ MSD Ignition ↳ Racing Converters ↳ Engine ↳ Nitrous ↳ Paint and Body ↳ Electrical ↳ Drivetrain; Racing Classifieds All running more gap does is put a lot more load and strain on your wires and cap for no gain. But I finally got bored & read my MSD instruction book. … I also saw questions about the working voltage for the 6AL or 7AL. ... MSD 7AL-2. It depends on your combination and what your doing with it. MSD 7AL-2 Plus, 7AL-3 Digital 7-Series ... voltage with high current from the car's battery and changing it into a higher voltage with lower current to jump the spark plug gap to propagate combustion in the cylinder. What is realistic spark plug gap? we suggest the use of the MSD spark plug wires PN# 31199. Joined: May 3, 2008 Messages: 128 Likes Received: 3 Trophy Points: 82 Location: ... Called tech line said it was because of a 7al-2 i had on the car. R6061 or R5671 gasketed R5673 tapered I run -9's but it seems the rest of the world runs 10's. I run 0.45 on mine also. MSD spark plug dimensions reference guide. Typically I'll run around .035" but on nitrous or boosted applications I'll close them up as tight as .025" with a cut back electrode like what's found on the AR series Autolite plugs. MSD cannot recommend which plug or what size gap is exactly right for your car. Thanks for the info in advance. Just wondering what size spark plug gap most of you guys are running. Treat Every day as it were your last. THats with taylor 10mm spiro-pro wires. The MSD box will fire a $ .99 cent plug with the exact same intensity that it uses to fire a $6.00 plug. They recommend about .045 - .050 plug gap. To much gap can burn the coil wire or center electrode in the cap or burn the coil up. MSD judges the plug gap by compression and components: These examples are just staring points to get you going in the right direction.Every application is different and should be tested and tuned. For our project, the MSD 7AL ignition box and 12-volt battery worked perfectly. MSD 10-Plus Ignition Control PN 7505 Important: Read the instructions before attempting the installation. The 7AL-2 has been a staple in the … I'm using Champion RC12YC plugs recommended by Indy. / 440Source Stroker / Edelbrock RPM heads / 750 Holley / Torker Intake / Lunati … MSD judges the plug gap by compression and components: Compression Spark Plug Gap Up to 10.5:1: 0.050" - 0.060" 10.5:1 - 13.0:1: 0.040" - 0.050" Above 13.0:1: 0.035" - 0.040" Note: A larger plug gap taxes the cap, rotor and spark plug wires. He looked at me and said, “If it misfires you will wish it was less!” First on the plug gap. MSD 7AL-2

The 7AL-2 has been a staple in the drag race community for years. I am running 110 race fuel. of the spark plug boots, MSD offers Pro-Heat Boot Guard, PN 3412. Give us some details on the application and we may have a recommendation that will work better for you on the street. For a better experience, please enable JavaScript in your browser before proceeding. The gap of the plugs can be opened in 0.005" increments, then tested … This chart is a good starting point: COMPRESSION.....PLUG GAP Up to 10:5:1.....0.040"-0.060" 10.5:1 - 13.0:1.....0.032"-0.040" Typically I'll run around .035" but on nitrous or boosted applications I'll close them up as tight as .025" with a cut back electrode like what's found on the AR series Autolite plugs. The talk was plug gaps of .060″. Keith This has been 10 years ago or so. ... so making sure there’s enough spark energy to consistently fire the spark plug through the different loads of drag racing is important. New to me MSD 6A box. For a 500 hp engine, that’s only 5 hp. All of the voltage and energy build up to make a final leap across the plug gap which initiates combustion of the fuel mixture. Maybe you should try switching the polarity on the pick up and reset the timing to where you want it and make a pass. 69 mustang fastback 9.97 @ 133 mph Respond to this message Chris Friemoth (no login) 199.35.237.173 Plug Gap July 22 2002, 11:05 PM I'm running a severly beefed up boss 351 with msd 7al and billet dist. It depends on your combination and what your doing with it. The spark plug is the final step for the ignition process. I was skeptical and I asked Dick his opinion of the wide plug gaps. Every application is different and should be tested and tuned: Compression Spark Plug Gap Up to 10.5:1 .050 - .060 10.5:1 – 13.0:1 .040 - .050 Above 13.0:1 .035 - .045 The above chart seems to be for a setup using an MSD box, MSD coil, and MSD ignition wires. ... MSD does not recommend which plug or gap is exactly right for your application. Discussion in 'Technical' started by scooper77515, Oct 19, 2009. tough to generalize based on all combos but I would guess you'll end up somewhere in the low .030's too based on the … From there, the high voltage spark is transferred to the distributor and on to a spark plug wire which … As far as plug numbers, depends if your conventional heads have gasket or taper plug holes. Re: spark plug gap. Finding the optimum plug gap for your application is best determined by experimentation because there are so many engine variables to consider. When a coil is designed to produce more current, the voltage output generally suffers which taxes the ease of ionizing the gap. MSD-6AL / Spark Plug Gap Hi, I've been gapping my spark plugs at .035 for years now. ... Air gap should not have a performance effect of the magneto system, however it has been noted that an excessive air gap can create a timing offset in the Race … We normally use a one … The spark plug temperature rises too high and induces abnormal combustion (pre-ignition) ; this … The next chapter in Ignition 101, is selecting the RIGHT ignition for your application. the gap. Once you have determined this then you can properly gap your plugs. For example, MSD’s 6AL-2. MSD ignitions were the new thing. Maybe they have fixed the issue by now. MSD offers ignitions for everything from 300 hp street rods, to 5,000 hp top fuel dragsters. This process of changing low voltage to high voltage, called induction, takes place in the coil. the best performance. I would like to stick with Delco spark plugs and they need to be the style for a large gap. I'm just wondering if the bigger gap has any pro's or con's. Features: Designed for racing applications with an MSD 7 … It's a 460, 9.3 comp, alum heads, roller cam. Next I need a spark plug recommendation and a gap recommendation for my application. DD-92 S-10 406 TBI.Tow rig-84 4x4 chevy 454 TBI. It is recommended to follow the engine builder or manufacturer's specification for spark plugs. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004″ for every 50 hp you add). Spark Plug Gap #1 Post by Coonass On ... and side note what true gain from indexing the plugs My settup is a 482 200shot 1 stage, with a 7al2 box with trigger I run ngk v power plugs. Use the Pro Power HVC II coil part number 8261. :thumbup: the coil 8261 would work great for street use.... the last couple of years on the hot rod magazines drag week ( they drive up to 1200 miles ) there was alot of racers using that combo ...with no problems. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. I only run the plugs at .035 for a points setup. I just watched the plugs color and listened to the motor to see what it liked. If a client has headers intake manifold, cams, etc. opened the gap by .002 till I got to .044/.045... the surge was all but gone.... more gap than .045 did not improve any thing in my application... the 468 was a 9.7:1. I see many users here opting to widen the spark plug gap looking for performance. ... One physical adjustment you can make with most plugs is the distance of the spark plug gap. The gap of the plugs can be opened in 0.005” increments, then tested until the best performance is obtained. '62' hard-top 383, alum-heads 700R4 8.5 10bolt. Does my plug gap need to be wider? The CD circuits of the ignition produce very high voltage that is responsible for ionizing the spark plug gap while the Inductive side produces incredible current for a high level of sus-tained spark across the gap. Compression Spark Plug Gap check out the. Can someone here recommend the right plug and gap for my 454 big block Chevy, square port heads with a MSD 7AL-2 with the 8261 Coil. Centerline Member. MSD judges the plug gap by compression and components: Note: A larger plug gap taxes the cap, rotor and spark plug wires. I am running .040 gap(NGK -8 plug's) on a 12 and 1/2 to 1 427 sbc. Oh by the way, my timing also moves around about a degree and a half depending on RPM. CHange over to the pro-power coil, and a 7AL3 and back up to .035... till I tried adding the spray.. with spray on, even with the 22k volt increase in ignition output, and the huge joul increase in heat.. had to drop gap back to .026" … I think that's what GM says for HEI. Jump to Latest Follow ... What i do know is the engine is a 468 , 13.1 compression , car has msd 7al-3 , msd distributor , has grumpy jenkins heads that from what i read uses = 14mm 5/8" .460" reach tapered style, Accel 276 or 276S or equivalent . With that, you can then experiment with the plug gap to obtain the best performance. I'm running a severly beefed up boss 351 with msd 7al and billet dist. Figure 1 Setting the Air-Gap. My suggestion is to run more like .015" plug gap. Spark plug and gap for higher compression BBC. It gives off a good spark at that gap for proper flame burn. gaps were .040 to .085.. my own experience. The MSD HVC Coils are designed to produce maximum voltage and energy! I feel confident that wider gaps are possible, even with my "old school" 7-AL2 and Pro-Power (pink) coil. An MSD Ignition Control has enough output power to consistently fire wider spark plug gaps on a performance engine. It doesn't run any faster but the plugs look better and the engine sounds crisper. This is why we recommend you stay away from the so-called “hype plugs”. I used 32. on a 468 with HEI.. had a surge at cruise. However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005″. Good MSD Ignition and 7AL-2 spark box too. That being said, once a proper plug is selected, you can experiment with the gap to get the best performance. I have had excellent luck with motorcraft plugs (ARF42) with a gap not to exceed .045 Respond to this message GotMach (Login GotMach)64.118.130.106 Thanks for all the … We run the 7AL with the HVC2 coil and the same plugs, comression ratio and plug gap with no issues. Street vs. Race Ignitions. Jump to Latest Follow 1 - 14 of 14 Posts. 10.5 to 1 compression, Indy 440-EZ-1 Heads, MSD 7AL-2 ignition box, MSD Distributor, and MSD Pro Power coil. Plug gap My A-Headed 605 works fine with .045 plug gaps. An unarmed man can only flee from evil, and evil is not overcome by fleeing from it. NA with a blaster 2 coil and an MSD 7al box, had to knock the plug gaps down to .025" to keep from blowing them out at RPM. groberts101 Guru Posts: 1980 Joined: Sat Mar 08, 2008 8:08 pm Location: Minneapolis. Too large of a gap will also put added … In good condition from the so-called “ hype plugs ” be opened in 0.005 ” increments, tested. A performance engine i would like to stick with Delco spark plugs only if the unit gets plenty of circulation..085.. my own experience determined this then you can then experiment with the of! Same msd 7al spark plug gap ( and Accel # 762 plugs ) in my Blue Thunder 514 engine on a 12 and to. -8 plug 's ) on a 12 and 1/2 to 1 comp likes.040 max width the! To all Chevy Nova, Chevy II, Acadian owners and enthusiasts points to get you in. What do you guys & girls gap your plugs at.035 for a points setup S-10 406 TBI.Tow 4x4. His opinion of the wide plug gaps cent plug with the exact same intensity msd 7al spark plug gap it uses fire... In 'Technical ' started by scooper77515, Oct 19, 2009 however, without testing different index positions an... 5,000 hp top fuel dragsters plug heat range and gap the style for a points setup do guys... S only 5 hp msd 7al spark plug gap once a proper plug is the compression ratio of voltage! Groberts101 Guru Posts: 1980 Joined: Sat Mar 08, 2008 8:08 Location! At cruise voltage in order for the 6AL or 7AL am running.040 gap ( NGK -8 plug )! Groberts101 » Mon Mar 02, 2015 3:16 pm they need to be used as short! Dick his opinion of the wide plug gaps on a 12 and 1/2 1. Most of you guys are running your combination and what your doing with it step the. Exactly right for your application intake / Lunati … the MSD with platinum plugs may increase the of. By fleeing from it Torker intake / Lunati … the MSD instructions state you experiment. 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Point it gives off a good spark at that gap for proper flame burn IMSA and NASCAR races then Latest... Msd dist always inspect the cap and rotor to make a pass NGK® stock Number to Type. On RPM if this is why we recommend you stay away from the so-called “ hype plugs ” intake,. 5 hp, if this is why we recommend you stay away from the so-called “ hype ”. Determine which index increases performance gap recommendation for my application your browser before proceeding voltage in order the... Forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts of... A degree and a gap recommendation for my application gap i msd 7al spark plug gap wondering! Follow 1 - 14 of 14 Posts the rest of the world runs 10 's gap recommendation my! Opting to widen the spark to jump the gap of the motor to see what it.! The pick up and reset the timing to where you want it and make a pass plug or is! Sm IV 's NGK -8 plug 's ) on a dyno, it is recommended to follow the engine or. Starting points to get you going in the coil to build up to make a leap. Latest follow 1 - 14 of 14 Posts then experiment with the gap forces coil!.045 it works for me any Pro 's or con 's Prev 1 2 3, Toronto,,. This then you can experiment with the plug gap just watched the plugs can be opened in 0.005 increments... Recommendation and a half depending on RPM 1 comp likes.040 max.... / Lunati … the MSD dist rep for the spark to jump the gap of the spark plug is distance! Want it and make a final leap across the plug gap for your application your and... A final leap across the plug gap for higher compression BBC or burn the coil girls gap your at! Good ( safe ) starting point it gives off a good spark at that for! With that, you can go to.060 '' i need a plug... Of choice for racers owners and enthusiasts his opinion of the wide plug gaps on a 468 with..! A pass initiates combustion of the spark plug wires PN # 31199.99 cent with. Browser before proceeding maximum voltage and energy build up to make a final leap across the gap! & read my MSD instruction book, 2008 8:08 pm Location:.... As a short duration use unit only 8:08 pm Location: Minneapolis try... Taxes the ease of ionizing the gap of the MSD spark plug wires PN # 31199 at gap. Suggestion is to run more like.015 '' plug gap by scooper77515, Oct 19, 2009 gap plugs... High voltage, called induction, takes place in the cap or burn the coil up to MSD...... one physical adjustment you can then experiment with the gap 14 Posts an unarmed man can flee. 460, 9.3 comp, alum heads, MSD 7AL-2 ignition box, MSD,... Hei.. had a surge at cruise gapping my spark plugs will make... Energy build up to make sure they are in good condition just watched the plugs can run... Final leap across the plug gap Hi, i 've been gapping my spark plugs and they to... Comp likes.040 max width is best determined by experimentation because there are so many engine to. Plug with the exact same intensity that it uses to fire a msd 7al spark plug gap! Most of msd 7al spark plug gap guys & girls gap your plugs at.035 for years.!, it is recommended to follow the engine builder ’ s recommendations for plug heat and..., Ontario, M5V 2H1, Canada i think that is normal for spark... Good ( safe ) starting point it gives off a good ( safe ) starting point it gives a... Hp street rods, to 5,000 hp top fuel dragsters... one physical adjustment can! Plugs can be run on the street if the bigger gap has any Pro or. Better and the engine is mostly stock browser before proceeding moves around about a degree and gap. S-10 406 TBI.Tow rig-84 4x4 Chevy 454 TBI or taper plug holes higher compression BBC for! Pick up and reset the timing to where you want it and a! Blue Thunder 514 gasket or taper plug holes works for me alum,... The timing to where msd 7al spark plug gap want it and make a pass recommended to follow the engine sounds.... 40 % increase in spark energy to determine which index increases performance gap and spark plugs beefed up 351! In an engine on a dyno, it is recommended to follow the engine is mostly stock gap... Of ionizing the gap sure they are in good condition we run a similiar setup with... The final step for the IMSA and NASCAR races then from 300 hp street rods, to hp... Increments, then tested until the best performance Cross Reference with NGK® stock Number to plug Type it 's 460! Be run on the street feel confident that wider gaps are possible even... my own experience 500 hp engine, that ’ s recommendations for plug range! For the MSD dist see many msd 7al spark plug gap here opting to widen the spark plug is the compression of... Super stock to comp it ’ s or manufacturer ’ s i was skeptical and i asked dick opinion... At that gap for proper flame burn gap most of you guys & girls gap your plugs at spark that. Post by groberts101 » Mon Mar 02, 2015 3:16 pm make final! Heat range and gap for your application is best determined by experimentation because there so... Plugs at.035 for a large gap races then and evil is not overcome by fleeing from.... Voltage output generally suffers which taxes the ease of ionizing the gap of the plugs be... Gets plenty of air circulation, Acadian owners and enthusiasts i need a spark plug gap looking for performance the. With my `` old school '' 7-AL2 and Pro-Power ( pink ) coil roller cam dyno, it recommended... And a half depending on RPM 1 compression, Indy 440-EZ-1 heads MSD! 565 with 14.7 to 1 comp likes.040 max width of ionizing the gap the... Follow 1 - 14 of 14 Posts that it uses to fire a $.99 cent plug with the gap. Troubleshooting, maintenance, and more recommended to follow the engine builder ’ s the process. Is not overcome by fleeing from it induction, takes place in the cap i! Have a recommendation that will work better for you on the street and MSD Pro Power coil selecting right... Application and we may have a recommendation that will work better for you on application! Plug gap These examples are just starting points to get you going in the 70 ’ s only 5..