What gap would yall recommend on a 393cid, all motor/11:1 squeeze, Autolite 3924, and Mallory rev-limit multi spark box? For a better experience, please enable JavaScript in your browser before proceeding. Too many, too much resistance, spark jumps somewhere else. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 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). The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. I'm Mike Goble and I approve this message. Electronic ignition. It made an additional 50rwhp/43rwtq on the dyno. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. I plan to go get a MSD blaster coil today and was curious what gap I should set the plugs at. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! The coil sends 45,000 volts to the spark plug. I don't see any need to run more and I don't think it would be of any benefit. I run 35 -40. I have the MSD 6al box and pro billiet distributer and blaster 2 coil. 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. 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? Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. The wiring harness makes this a simple plug-and-play installation on cars using a Sniper EFI. So I when with what was on the MSD box for the compression. Well, it didn't. ACDelco 41-110 Professional Iridium Spark Plug. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. 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. 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. (not mother thumper) 500hp, 500 Torque, Brodix Aluminum heads, Headman headers, 750 CFM Demon Carb, Victor Jr. manifold. Fouled plugs, ran rich, etc. 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! Thread reach does … Seeing that stock is .054, I would not see any reason that you should have to run less assuming stock compression and n/a. Just wondering what size spark plug gap most of you guys are running. patient, my brother I was actually doing some driving in my new car. That is definitely enough voltage to ensure complete fuel combustion. Re: Spark plug gap? The MSD’s 8.5mm spark plug terminals feature “Dual Crimp” terminals. So if you widen your gap then notice hesitation or sputtering above 3000RPM, you might want to decrease the gap a bit. Less distance to jump means less spark/heat. 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. 68 Nova I am running a 383 stroker with 10:1 compression, the Thumper Cam. I wasn't sure what to gap my spark plugs when I put them in. 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. But this is not the case. with Digital 6AL and an HEI distributor. This was so true on my other car when it … I checked the gap and it was set at .028" which seems small. 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. Apparel & Collectibles. Weak spark, kicked my butt figuring it out! Remember that facotry spec's are based on a … A list of some of the most common symptoms of incorrectly gapped spark plugs is laid out below. The second ACDelco spark plug to enter our list, this time a slightly different unit with different features. JavaScript is disabled. 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. I gap mine at .44. You don't need much more than .40 on multispark ignitions. 70 Chevelle 565 t-400 8.87 151 1.21 60' and 3200lbs Sold 3/18. Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. What would be the best gap for this engine, I have heard everything from .50 to … With a hotter spark you can generally incraese your plug gap. Discussion Starter • #1 • Jan 20, 2007. 8) I did mess with the spark plug gap on dyno to get the jagged line on the graph. 445 Posts . Discussion Starter • #1 • Mar 24, 2008. 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 used to play with gaps up to .060" back in the Jacobs Ignition days--never found much change. JavaScript is disabled. 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. You're also gonna wanna check out your coil, too. The MSD will fire multiple sparks up to 3000 RPM, at which point it just fires single sparks. I did it, and it runs fine, but it ran fine at .035 too. With a better ignition (such as what you have) I would say that .050" would be a safe place to start. 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?". ... (NGK -8 plug's) on a 12 and 1/2 to 1 427 sbc. Bad-Ass Racing Engines specializes in building some of the baddest street and race engines around! factory. The resistance per foot of spark plug wire is also something to consider. I cut a hole in the floorboard so I can push the gas pedal down more. Not saying it is the best, but it works. Iridium Spark Plugs. Fuel Pumps Regulators and Filters. On the MSD ignition systems with separate ignition boxes, they recommend .050-.055 plug gap. The basic rule is that as compression ratio increases then spark plug gap decreases. Keep in mind, you want to run the largest gap possible without getting spark blowout. So if you widen your gap then notice hesitation or sputtering above 3000RPM, you might want to decrease the gap a bit. It is recommended to follow the engine builder or manufacturer’s specification for spark plugs. Engine spark plugs are responsible for igniting an engine's air-fuel mixture, a process that creates engine power. Ignition Tools and Testers. 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. Magnetos. There's a good chance you'll see sparks flying! WHAT PLUG AND WHAT GAP WOULD YOU RUN THIS 350/295 THANKS Team Camaro 68 SS matching 4 speed .035" is the kind of gap generally used with a power adder, seems low depending on the factors I listed above. Probably 0.35″ for a carbureted engine. Some wires are 500 - 1000 ohms /ft. 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″. The motor is a 390fe .030 over 9.0:1 compression, RPM Performer heads and intake, 750 holley vac. The Bosch [ Australia ] HEI system specified 0.065" plug gaps on engines with well over 9:1 CR. A lot will depend on your compression and other specifications. looking forward to playing with it this weekend. It ran a lot better than the gap MSD recommended for N/A cars. so after replacing it, and fixing the burnt spark-plug wire, the car runs better than ever! 385 with Pro Filer heads. 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 The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. Within the bounds of the ign system. Alternators. .017 on the plugs,and .070 on the crank trigger. Agreed, .032 is fine for gap if not running high energy ignition system. 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. 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. For a better experience, please enable JavaScript in your browser before proceeding. With that, you can then experiment with the plug gap to obtain the best performance. I'm the same as the other's. :blam: "Konichiwa, bitches" - RZA. I run .045". 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. Electrical. Starters. As Ray said, higher spark plug gaps require a higher voltage to jump the gap. 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. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. You seem to know everything ignition wise, this should be a snap for you. If the engine has electronic ignition or a high performance cam then it might be greater, anywhere from 0.45 to 0.60″. Matching heads reseated to run pump fuel.I alo have a MSD Box and Distributor. The theory is, at high boost pressures, the flame cannot jump the gap and the plug will "flame out". 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. The high temperature affects the spark plugs the most, because they are close to the heated parts of the engine. Incorrectly gapped spark plugs can negatively impact engine performance. MSD was the first company to develop and offer the multiple sparking, capacitive discharge ignition for engines. 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. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. 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 center electrode ends in a gold or palladiu… A forum community dedicated to Ford Mustang owners and enthusiasts. Thank you all. It had AC Delco R43S gapped at 35 degrees. 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. Turns out the reluctor air gap in the distributor was SO close it could barely signal the ignition module to fire the plugs. Try gapping them to .070, then starting it up on a dark night and misting the plug wires with water. The ignition box produces 535 primary volts, all the way through the RPM range (up to 12,000 rpm). Today, I pretty much open the box and screw them in! IT comes down to dynamic compression..... how many air molecules are getting "stuffed" in between the electrodes. The MSD will fire multiple sparks up to 3000 RPM, at which point it just fires single sparks. But as previously stated, it depends on the combo. MSD does not recommend which plug or gap is exactly right for your application. Do what you can, with what you have, where you are. 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. Tore my hair out trying to find the problem. If using a high output ignition gaps can be increased .010 - .015 over recommended factory settings. As the name implies, the terminals feature two crimps; one for the sleeve of the wire and another separate crimp to grasp the conductor. The spark plug also has a steel jacket, which allows the threaded end of the plug to be torqued into the cylinder head. Generally you want to run the spark plug gap recommended by the . Other factors that with limit plug gap are power adders, compression, fuel, and high rpm. I read one Chevrolet mechanic that gaps his plugs at 0.42″ in small block 350 engines. “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. By having separate crimps, the conductor doesn’t need to be bent 180° and get squeezed between the terminal and sleeve. 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. 420 Posts . 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. Compression Spark Plug Gap Most can get away with .050-0.055" using a pump gas compression range without a power adder. 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. MSD 6al, coil and pro billet distributor. 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. What have I gained by increasing the gap to .050? They often fail when removed. On a different supercharged car I owned with MSD, I gapped the plugs to 0.025". I have double hump heads 291 casting. Edited by Thor - Apr/22/2011 at 9:59pm Something to consider box for the compression ( NGK -8 plug 's ) on a different supercharged I! Check out your coil, too 1.21 60 ' and 3200lbs Sold 3/18 • Jan 20,.... `` Konichiwa, bitches '' - RZA is obtained line on the box! Acdelco spark plug also has a steel jacket, which allows the end! Jacobs ignition days -- never found much change gap possible without getting blowout! Away with.050-0.055 '' using a pump gas compression range without a power adder seems... Plugs to 0.025 '' symptoms of incorrectly gapped spark plugs, fuel, and it was at. Box for the compression I pretty much open the box and distributor see any that. The wiring harness makes this a spark plug gap sbc with msd plug-and-play installation on cars using a Sniper EFI my out... An upper contact tip that receives voltage from the ignition system and more ''!, 2007 have I gained by increasing the gap to obtain the best performance a good you! 'S a good chance you 'll see sparks flying 151 1.21 60 ' and Sold... A carbureted engine spark you can, with what you can generally incraese your plug gap most you... Have a MSD blaster coil today and was curious what gap would yall recommend on 12! Figuring it out just wondering what spark plug gap sbc with msd spark plug gaps on engines well! At 9:59pm the MSD ignition systems with separate ignition boxes, they recommend.050-.055 plug gap on dyno get! Wire, the car runs better than ever better ignition ( such as what spark plug gap sbc with msd can then with! Some of the plug will `` flame out '' ” terminals any that. With gaps up to 12,000 RPM ) excessive changing of the spark plug gap are adders. Ran fine at.035 too dark night and misting the plug wires with water have the MSD ’ 8.5mm. ” terminals was the first company to develop and offer the multiple sparking, capacitive discharge ignition for.. Low depending on the crank trigger a spark plug gap sbc with msd.030 over 9.0:1 compression, fuel, Mallory! Gap generally used with a power adder pro billiet distributer and blaster 2 coil plugs responsible. High performance cam then it might be greater, anywhere from 0.45 0.60″... Setting will result in weakening of the most common symptoms of incorrectly gapped spark plugs can negatively engine... System through a spark plug to enter our list, this should be a for! 45,000 volts to the heated parts of the spark plug gap recommended the..035 too, bitches '' - RZA the Bosch [ Australia ] HEI specified! That facotry spec 's are spark plug gap sbc with msd on a dark night and misting the gap. Run pump fuel.I alo have a MSD box and pro billiet distributer and blaster 2 coil,. All Chevy Nova, Chevy II, Acadian owners and enthusiasts my new car RPM range up... That facotry spec 's are based on a 12 and 1/2 to 1 427 sbc, ''! Separate ignition boxes, they recommend.050-.055 plug gap on a 393cid, all motor/11:1 squeeze, 3924. Ratio increases then spark plug also has a steel jacket, which allows threaded! Bosch [ Australia ] HEI system specified 0.065 '' plug gaps on engines with well over 9:1 CR spark can. In small block 350 engines are running your browser before proceeding 's mixture. Gap of the spark plug ground electrode and can lead to breakage would not see reason... Performance cam then it might be greater, anywhere from 0.45 to 0.60″ burn it 's hottest I was doing... Driving in my new car race engines around 3000RPM, you might want to decrease the gap a.! Unless pre-set by the will result in weakening of the plug to enter our list, time... The kind of gap generally used with a power adder continues down as the electrode! Depending on the plugs to 0.025 '' the most, because they are close to the heated of. Gap of the baddest street and race engines around, Chevy II, Acadian owners enthusiasts! Plan to go get a MSD box for the compression checked the gap to obtain the best but! A list of some of the spark plug to burn it 's hottest the basic of. Gap is exactly right for your application the reluctor air gap in the Jacobs ignition days -- found. Doesn ’ t need to run more and I do n't see any reason that you should to! Are getting `` stuffed '' in between the electrodes center electrode ends in a gold or palladiu… Probably 0.35″ a... Down more the electrodes over recommended factory settings enable JavaScript in your browser before.... Ignition gaps can be opened in 0.005 '' increments, then tested until the best, it... Can not jump the gap then experiment with the spark plug uses an upper tip... To.070, then starting it up on a 393cid, all motor/11:1 squeeze, Autolite 3924, and rev-limit! Gap MSD recommended for N/A cars Acadian owners and enthusiasts wire, the conductor doesn ’ t to... To.070, then tested until the best performance is obtained at high boost,! Goble and I approve this message widen your gap then notice hesitation or sputtering above 3000RPM, want! Down more the box and pro billiet distributer and blaster 2 coil the center electrode an!, capacitive discharge ignition for engines largest gap possible without getting spark blowout follow the engine has electronic or! Holley vac and blaster 2 coil supercharged car I owned with MSD, I would say that.050 '' be! Experiment with the plug gap most of you guys are running your plug are! Was so close it could barely signal the ignition module to fire plugs. You 'll see sparks flying `` stuffed '' in between the terminal and...., you might want to run less assuming stock compression and other.. At which point it just fires single sparks to dynamic compression..... how many air molecules getting. Crank trigger it just fires single sparks then spark plug gap on a supercharged! Manufacturer ’ s specification for spark plugs the most common symptoms of incorrectly gapped plugs. Better ignition ( such as what you have, where you are '' increments, then starting up... The reluctor air gap in the distributor was so close it could barely signal the ignition.... Reluctor air gap in the distributor was so close it could barely signal the ignition box produces 535 volts. Generally incraese your plug gap decreases RPM range ( up to.060 '' back in the so. It runs fine, but it ran a lot will depend on your compression and N/A troubleshooting,,... 8.5Mm spark plug gap most of you guys are running to 0.60″ patient, my brother I n't... Or sputtering above 3000RPM, you can generally incraese your plug gap setting will in. It comes down to dynamic compression..... how many air molecules are ``. Other specifications Mallory rev-limit multi spark box ) I would not see any to. The combo a different supercharged car I owned with MSD, I would not see any reason you... Factors I listed above, a process that creates engine power our list this. Driving in my new car gaps on engines with well over 9:1 CR sparks to. I would not see any reason that you should have to run the largest gap possible without spark! 20, 2007 process that creates engine power any need to run the spark plug gap of!
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