This has been 10 years ago or so. 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. Finding the optimum plug gap for your application is best determined by experimentation because there are so many engine variables to consider. It's a 460, 9.3 comp, alum heads, roller cam. MSD cannot recommend which plug or what size gap is exactly right for your car. 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 … Next I need a spark plug recommendation and a gap recommendation for my application. Discussion in 'Technical' started by scooper77515, Oct 19, 2009. 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. New to me MSD 6A box. I am running .040 gap(NGK -8 plug's) on a 12 and 1/2 to 1 427 sbc. Re: spark plug gap. Dick Gale was the Champion Spark Plug Racing rep for the IMSA and NASCAR races then. JavaScript is disabled. Spark plug and gap for higher compression BBC. MSD 6AL Spark Plug Gap. 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 I run 0.45 on mine also. MSD Cross Reference with NGK® Stock Number to Plug Type. All running more gap does is put a lot more load and strain on your wires and cap for no gain. 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. THats with taylor 10mm spiro-pro wires. 30° is a good (safe) starting point The spark plug temperature rises too high and induces abnormal combustion (pre-ignition) ; this … For our project, the MSD 7AL ignition box and 12-volt battery worked perfectly. the best performance. Plug gap My A-Headed 605 works fine with .045 plug gaps. Engine is a 540 cu.in. 10.5 to 1 compression, Indy 440-EZ-1 Heads, MSD 7AL-2 ignition box, MSD Distributor, and MSD Pro Power coil. Just wondering what size spark plug gap most of you guys are running. It is … It can be run on the street if the proper coil is used and if the unit gets plenty of air circulation. 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" … What do you guys & girls gap your plugs at? MSD 10-Plus Ignition Control PN 7505 Important: Read the instructions before attempting the installation. 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. Opening the gap forces the coil to build up a higher voltage in order for the spark to jump the gap. I see many users here opting to widen the spark plug gap looking for performance. 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). I'm using Champion RC12YC plugs recommended by Indy. MSD judges the plug gap by compression and components: Note: A larger plug gap taxes the cap, rotor and spark plug wires. An unarmed man can only flee from evil, and evil is not overcome by fleeing from it. That being said, once a proper plug is selected, you can experiment with the gap to get the best performance. The 10-PLUS Coil, PN 8208, is the only coil that can be used with this ignition … From Super Stock to Comp it’s the ignition of choice for racers. Jim 383 stroked to 432c.i. Recommended Spark Plug Torque Specifications. '62' hard-top 383, alum-heads 700R4 8.5 10bolt. 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. The MSD HVC Coils are designed to produce maximum voltage and energy! I just watched the plugs color and listened to the motor to see what it liked. I only run the plugs at .035 for a points setup. http://photobucket.com/albums/d180/Bad68Nova_/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). 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. 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. Top. 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 … When a coil is designed to produce more current, the voltage output generally suffers which taxes the ease of ionizing the gap. The familiar gold box has been redesigned to deliver an 40% increase in spark energy! Does my plug gap need to be wider? We run the 7AL with the HVC2 coil and the same plugs, comression ratio and plug gap with no issues. Street vs. Race Ignitions. With that, you can then experiment with the plug gap to obtain the best performance. As far as plug numbers, depends if your conventional heads have gasket or taper plug holes. gaps were .040 to .085.. my own experience. Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. This is why we recommend you stay away from the so-called “hype plugs”. .045 for me too. ... 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 … The talk was plug gaps of .060″. groberts101 Guru Posts: 1980 Joined: Sat Mar 08, 2008 8:08 pm Location: Minneapolis. My suggestion is to run more like .015" plug gap. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. Keith RM. I feel confident that wider gaps are possible, even with my "old school" 7-AL2 and Pro-Power (pink) coil. / 440Source Stroker / Edelbrock RPM heads / 750 Holley / Torker Intake / Lunati … the gap. 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. 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. The gap of the plugs can be opened in 0.005" increments, then tested … 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. MSD 7AL-2

The 7AL-2 has been a staple in the drag race community for years. I think that is normal for the MSD dist. SPARK PLUG GAP These examples are just starting points to get you going in the right direction. The MSD box will fire a $ .99 cent plug with the exact same intensity that it uses to fire a $6.00 plug. If the spark cannot jump the gap between the electrode and … Centerline Member. I use the same gap (and Accel #762 plugs) in my Blue Thunder 514. MSD-6AL / Spark Plug Gap Hi, I've been gapping my spark plugs at .035 for years now. Thanks for the info in advance. The MSD 7AL-2 is meant to be used as a short duration use unit only. For a 500 hp engine, that’s only 5 hp. The spark plug is the final step for the ignition process. Give us some details on the application and we may have a recommendation that will work better for you on the street. 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. 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. An MSD Ignition Control has enough output power to consistently fire wider spark plug gaps on a performance engine. 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. MISCELLANEOUS INFORMATION The gap of the plugs can be opened in 0.005” increments, then tested until the best performance is obtained. It doesn't run any faster but the plugs look better and the engine sounds crisper. 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. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! If a client has headers intake manifold, cams, etc. we suggest the use of the MSD spark plug wires PN# 31199. It gives off a good spark at that gap for proper flame burn. I'm running a severly beefed up boss 351 with msd 7al and billet dist. R6061 or R5671 gasketed R5673 tapered I run -9's but it seems the rest of the world runs 10's. I was skeptical and I asked Dick his opinion of the wide plug gaps. ... so making sure there’s enough spark energy to consistently fire the spark plug through the different loads of drag racing is important. 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. Maybe they have fixed the issue by now. I just seem to be stuck on .045 It works for me. It is recommended to follow the engine builder’s or manufacturer’s recommendations for plug heat range and gap. We normally use the stock gap and spark plugs only if the engine is mostly stock. 0.45 here. For a better experience, please enable JavaScript in your browser before proceeding. 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. check out the. I also saw questions about the working voltage for the 6AL or 7AL. It also features a popular two-step rev control for staging and over rev protection. Plugs look better and the engine sounds crisper heads / 750 Holley / Torker intake / Lunati the! Pro-Power ( pink ) coil and 1/2 to 1 compression, Indy 440-EZ-1 heads, roller.... Most plugs is the final step for the IMSA and NASCAR races.! It can be opened in 0.005 '' increments, then tested until best. 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