Less distance to jump means less spark/heat. .017 on the plugs,and .070 on the crank trigger. I'm the same as the other's. MSD 6AL box, MSD distributor and wires Aluminum Procomp heads 10-1 compression 91 octane gas NGK 7 plugs Smaller roller comp cam I pulled the plugs and they were very black and even had some burnt carbon crunchies on them. So I when with what was on the MSD box for the compression. Apparel & Collectibles. 68 Nova I am running a 383 stroker with 10:1 compression, the Thumper Cam. It had AC Delco R43S gapped at 35 degrees. Compression Spark Plug Gap The motor is a 390fe .030 over 9.0:1 compression, RPM Performer heads and intake, 750 holley vac. What have I gained by increasing the gap to .050? Now, for the question I asked you previously, what is the spark plug gap for the nitro classes MSD 44 and 60 ampere CDI magnetos? I have read, in several places, that if one is using an HEI distributor it's good to increase the gap from the usual .035 (on a 360ci engine) to .050. I have a 347 with AFR heads and MSD 6al, blaster SS coil, pro-billit distributor, etc... "Whats the point of a dream if you can't drive it?". This means if your following the factory specs for gap on a stock 302 with 8:1 compression then your probably throwing away some of your ignition's true ability. http://performanceparts.com/part.php?partID=183703, http://s28.photobucket.com/albums/c...urrent=l_a08506b7c64514ddc390d4a105b68a7a.jpg, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I checked the gap and it was set at .028" which seems small. If using a high output ignition gaps can be increased .010 - .015 over recommended factory settings. take um out of the box and thread um in the head...now if the gap looks way tight or loose I'll put a feeler gauge to it. It ran a lot better than the gap MSD recommended for N/A cars. What gap would yall recommend on a 393cid, all motor/11:1 squeeze, Autolite 3924, and Mallory rev-limit multi spark box? Probably 0.35″ for a carbureted engine. The Bosch [ Australia ] HEI system specified 0.065" plug gaps on engines with well over 9:1 CR. with Digital 6AL and an HEI distributor. What’s more, this set comes as a pack of eight, allowing you to fully replace the spark plugs in your engine, or have some lying around for spares. I have mine at .040" in this 383 which has a little more compression, Victor Jr./850 Quickfuel carb.. Last 383 I think I was running them at .045" both I had the 6AL boxes in them. The resistance per foot of spark plug wire is also something to consider. Thank you all. 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. Ignition Tools and Testers. 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). So if you widen your gap then notice hesitation or sputtering above 3000RPM, you might want to decrease the gap a bit. The ignition box produces 535 primary volts, all the way through the RPM range (up to 12,000 rpm). Matching heads reseated to run pump fuel.I alo have a MSD Box and Distributor. WHAT PLUG AND WHAT GAP WOULD YOU RUN THIS 350/295 THANKS Team Camaro 68 SS matching 4 speed I run .045". Well, it didn't. 07-30-05 05:04 AM - Post# 750361 In response to MG66Biscayne For a stock module HEI, the .060 might be a little to much gap. There's a good chance you'll see sparks flying! I have double hump heads 291 casting. Generally you want to run the spark plug gap recommended by the . On a different supercharged car I owned with MSD, I gapped the plugs to 0.025". patient, my brother I was actually doing some driving in my new car. Edited by Thor - Apr/22/2011 at 9:59pm VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I have the MSD 6al box and pro billiet distributer and blaster 2 coil. I cut a hole in the floorboard so I can push the gas pedal down more. Bad-Ass Racing Engines specializes in building some of the baddest street and race engines around! Try gapping them to .070, then starting it up on a dark night and misting the plug wires with water. Not saying it is the best, but it works. MSD does not recommend which plug or gap is exactly right for your application. Alternators. The center electrode ends in a gold or palladiu… The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. This was so true on my other car when it … I don't see any need to run more and I don't think it would be of any benefit. They stand for Multiple Spark Discharge, a patented design by MSD Ignition that fires your spark plug multiple times rather than the single time that the factory ignition does. looking forward to playing with it this weekend. For a better experience, please enable JavaScript in your browser before proceeding. ... (NGK -8 plug's) on a 12 and 1/2 to 1 427 sbc. They often fail when removed. Discussion Starter • #1 • Mar 24, 2008. Just wondering what size spark plug gap most of you guys are running. With MSD box, it ran fine with stock .044" I did regapped it to .033" and same power result, it turned out to be my total timing under boost was too low which was making the dyno graph jagged. But this is not the case. 90Cobra,10.3-1, 408W,4340 steel crank,H-beams, SRS pistons,AFR 205,Vic Jr,FTI solid roller,Prosystem 950,1 3/4"LT,3",G-Force T-5,31 spline,3.73. That is definitely enough voltage to ensure complete fuel combustion. 1988 Hatch: 414w, AFR 225's, CompCams XFI 236hr cam, 42lb injectors, 95mm PMAS MAF, Reichard Racing Trick Flow TFS-R air gapped lower, TFS-R 90mm upper, Accufab 90mm tb, Kooks 1-7/8'' longtubes, Tremec 3550 TKO, 3.73's, Moates Quarterhorse, BE/EA. With that, you can then experiment with the plug gap to obtain the best performance. A lot will depend on your compression and other specifications. MSD was the first company to develop and offer the multiple sparking, capacitive discharge ignition for engines. Most can get away with .050-0.055" using a pump gas compression range without a power adder. 70 Chevelle 565 t-400 8.87 151 1.21 60' and 3200lbs Sold 3/18. Weak spark, kicked my butt figuring it out! Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. The theory is, at high boost pressures, the flame cannot jump the gap and the plug will "flame out". Remember that facotry spec's are based on a … Electrical. stock plug gap is .054 and with my old stock compression 302 I use to run .065" w/ 6AL, Blaster 2 coil, and 9mm wires. Keep in mind, you want to run the largest gap possible without getting spark blowout. The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. The high temperature affects the spark plugs the most, because they are close to the heated parts of the engine. Starters. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. Common sense tells me that the greater the plug gap, the greater exposure the mixture gets to the heat of the spark, the heat in the spark being what ignites the mixture. IT comes down to dynamic compression..... how many air molecules are getting "stuffed" in between the electrodes. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. If you start at a .045 gap, and the gap wears to .065, you run the risk of punching through the ceramic of the plugs or jumping across the core nose of the plug, or leaking out at the plug wires, especially if the wires get wet. Tore my hair out trying to find the problem. A list of some of the most common symptoms of incorrectly gapped spark plugs is laid out below. What would be the best gap for this engine, I have heard everything from .50 to … With a better ignition (such as what you have) I would say that .050" would be a safe place to start. By having separate crimps, the conductor doesn’t need to be bent 180° and get squeezed between the terminal and sleeve. MSD 6al, coil and pro billet distributor. 420 Posts . But as previously stated, it depends on the combo. The MSD will fire multiple sparks up to 3000 RPM, at which point it just fires single sparks. Some wires are 500 - 1000 ohms /ft. Proper spark plug gap with MSD 6a Don't know it this is the right forum, but my question is: I have built a 200 Ford I6, cam etc., using a 6A box, blaster coil, built DuraSpark and using Autolite AP 46 plugs. I read one Chevrolet mechanic that gaps his plugs at 0.42″ in small block 350 engines. You're also gonna wanna check out your coil, too. After I have run the dual switchable MSD 6A CD box in/out configuration for a year or so, and become convinced that the MSD 6A box will rarely fail, then I will always run with the MSD 6A box and start to open-up the spark plug gap to 0.055 inch and onto 0.060 inch. :blam: "Konichiwa, bitches" - RZA. I used to play with gaps up to .060" back in the Jacobs Ignition days--never found much change. For a better experience, please enable JavaScript in your browser before proceeding. Turns out the reluctor air gap in the distributor was SO close it could barely signal the ignition module to fire the plugs. You don't need much more than .40 on multispark ignitions. I'm Mike Goble and I approve this message. I wasn't sure what to gap my spark plugs when I put them in. Incorrectly gapped spark plugs can negatively impact engine performance. The second ACDelco spark plug to enter our list, this time a slightly different unit with different features. On the MSD ignition systems with separate ignition boxes, they recommend .050-.055 plug gap. Magnetos. Do what you can, with what you have, where you are. A forum community dedicated to Ford Mustang owners and enthusiasts. The wiring harness makes this a simple plug-and-play installation on cars using a Sniper EFI. Other factors that with limit plug gap are power adders, compression, fuel, and high rpm. Seeing that stock is .054, I would not see any reason that you should have to run less assuming stock compression and n/a. If the engine has electronic ignition or a high performance cam then it might be greater, anywhere from 0.45 to 0.60″. The spark plug also has a steel jacket, which allows the threaded end of the plug to be torqued into the cylinder head. I watched a guy pickup .4 tenths changing the plup gap from .030 to .018 with a 20 MSD mag.Also unless its below 70 degrees outside use straight alky to start it,gas can flood it too easy.-Dale JavaScript is disabled. I was running a .038 gap with TFS heads (10.5 306) and a 6al, It was fine for a 125 shot but I have closed it up to .035 for a 150 shot. As the name implies, the terminals feature two crimps; one for the sleeve of the wire and another separate crimp to grasp the conductor. So if you widen your gap then notice hesitation or sputtering above 3000RPM, you might want to decrease the gap a bit. secondaries, Pro billet distributor, MSD 6a box, and blaster 2 coil, Ford Racing 9mm spark plug wires and accel plugs I also have a Crane energizer cam. The MSD’s 8.5mm spark plug terminals feature “Dual Crimp” terminals. factory. I gap mine at .44. Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. It made an additional 50rwhp/43rwtq on the dyno. Engine spark plugs are responsible for igniting an engine's air-fuel mixture, a process that creates engine power. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! I think I will put them back to .045 which is pretty much where i think they were when they came out of the box... :turn: Purpose of a high output ignition system, is increased voltage resulting in a hotter spark. Iridium Spark Plugs. As Ray said, higher spark plug gaps require a higher voltage to jump the gap. I plan to go get a MSD blaster coil today and was curious what gap I should set the plugs at. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. The coil sends 45,000 volts to the spark plug. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. (not mother thumper) 500hp, 500 Torque, Brodix Aluminum heads, Headman headers, 750 CFM Demon Carb, Victor Jr. manifold. Thread reach does … You seem to know everything ignition wise, this should be a snap for you. The basic rule is that as compression ratio increases then spark plug gap decreases. 385 with Pro Filer heads. so after replacing it, and fixing the burnt spark-plug wire, the car runs better than ever! Within the bounds of the ign system. Electronic ignition. Agreed, .032 is fine for gap if not running high energy ignition system. Fouled plugs, ran rich, etc. Re: Spark plug gap? Fuel Pumps Regulators and Filters. Too many, too much resistance, spark jumps somewhere else. I run 35 -40. “The biggest misunderstanding among Sportsman racers, particularly in short track oval competition,” says MSD’s Erik Brock, involves spark plug gaps—many of them believe the bigger the gap, the more power produced. 8) I did mess with the spark plug gap on dyno to get the jagged line on the graph. ACDelco 41-110 Professional Iridium Spark Plug. If you just put a plug in, your not allowing the plug to burn it's hottest. haha, i'm getting wire insulators after work today over at the Performance Automotive Warehouse, to insulate and to cover my fix job on the burnt wire... update- gapped all the spark plugs to .050", and had to replace one that was broken! .035" is the kind of gap generally used with a power adder, seems low depending on the factors I listed above. It is recommended to follow the engine builder or manufacturer’s specification for spark plugs. The MSD will fire multiple sparks up to 3000 RPM, at which point it just fires single sparks. Discussion Starter • #1 • Jan 20, 2007. I did it, and it runs fine, but it ran fine at .035 too. Today, I pretty much open the box and screw them in! If you're looking for new spark plug wires, it's a really good idea to replace the cap and rotor while you're at it since that isn't expensive to do. Oh, really, well, mine don't call for the .060 electronics killer, it clearly states right there on the emissions sticker, spark plug gap - .035. With a hotter spark you can generally incraese your plug gap. JavaScript is disabled. 445 Posts . 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″. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! They recommend.050-.055 plug gap on a dark night and misting the plug wires with.... Gaps can be increased.010 -.015 over recommended factory settings is a 390fe.030 over 9.0:1,., Toronto, Ontario, M5V 2H1, Canada with what you then... You seem to know everything ignition wise, this should be a for... Ignition or a high performance cam then it might be greater, anywhere from spark plug gap sbc with msd! Spark you can then experiment with the spark plug terminals feature “ Dual Crimp ” terminals guys. 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Ignition box produces 535 primary volts, all motor/11:1 squeeze, Autolite 3924 and. To.060 '' back in the floorboard so I when with what you,... Gon na wan na check out your coil, too get squeezed between the electrodes the baddest street and engines. Volts to the spark plug gap on a … Iridium spark plugs spark plug gap sbc with msd,... Offer the multiple sparking, capacitive discharge ignition for engines a simple plug-and-play installation on cars using a Sniper.. The compression Australia ] spark plug gap sbc with msd system specified 0.065 '' plug gaps require a higher voltage to complete... To go get a MSD blaster coil today and was curious what I! Higher voltage to ensure complete fuel combustion has a steel jacket, allows..., you can, with what you can generally incraese your plug setting...