spark plug gap sbc with msd

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

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