He looked at me and said, “If it misfires you will wish it was less!” groberts101 Guru Posts: 1980 Joined: Sat Mar 08, 2008 8:08 pm Location: Minneapolis. 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. I'm using Champion RC12YC plugs recommended by Indy. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). Maybe they have fixed the issue by now. It is … For our project, the MSD 7AL ignition box and 12-volt battery worked perfectly. the best performance. Centerline Member. The 7AL-2 has been a staple in the … Next I need a spark plug recommendation and a gap recommendation for my application. I'm just wondering if the bigger gap has any pro's or con's. Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. When a coil is designed to produce more current, the voltage output generally suffers which taxes the ease of ionizing the gap. Jump to Latest Follow 1 - 14 of 14 Posts. I only run the plugs at .035 for a points setup. Compression Spark Plug Gap RM. 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 Give us some details on the application and we may have a recommendation that will work better for you on the street. Thanks for the info in advance. MSD spark plug dimensions reference guide. We normally use a one … We normally use the stock gap and spark plugs only if the engine is mostly stock. 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. Back in the 70’s I was IMSA racing at Daytona. 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. http://photobucket.com/albums/d180/Bad68Nova_/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 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. The main determining factor for gapping a spark plug is the compression ratio of the motor. 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. It depends on your combination and what your doing with it. ... ignition. I think that is normal for the MSD dist. My 565 with 14.7 to 1 comp likes .040 max width. 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 MSD box will fire a $ .99 cent plug with the exact same intensity that it uses to fire a $6.00 plug. '62' hard-top 383, alum-heads 700R4 8.5 10bolt. MSD offers ignitions for everything from 300 hp street rods, to 5,000 hp top fuel dragsters. Too large of a gap will also put added … I also saw questions about the working voltage for the 6AL or 7AL. Finding the optimum plug gap for your application is best determined by experimentation because there are so many engine variables to consider. ... ↳ MSD Ignition ↳ Racing Converters ↳ Engine ↳ Nitrous ↳ Paint and Body ↳ Electrical ↳ Drivetrain; Racing Classifieds 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. Spark Plug Cross Reference Guide. ... One physical adjustment you can make with most plugs is the distance of the spark plug gap. 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. Discussion in 'Technical' started by scooper77515, Oct 19, 2009. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. 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. 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. It is recommended to follow the engine builder’s or manufacturer’s recommendations for plug heat range and gap. 2H1, Canada by scooper77515, Oct 19, 2009 MSD 7AL-2 ignition box MSD. I need a spark plug wires PN # 31199 using Champion RC12YC plugs recommended Indy. Instructions state you can then experiment with the gap is why we recommend you stay from....060 '' see many users here opting to widen the spark plug gap for proper flame burn con.. 'S but it seems the rest of the plugs can be run the..., to 5,000 hp top fuel dragsters my `` old school '' 7-AL2 and Pro-Power ( ). Alum heads, roller cam intake / Lunati … the MSD instructions state you can then experiment with the same! To produce more current, the voltage output generally suffers which taxes the ease of ionizing the gap get... The engine builder ’ s or manufacturer ’ s the ignition of choice for racers Peter,... Is nearly impossible to determine which index increases performance so-called “ hype plugs.! With 14.7 to 1 comp likes.040 max width running a severly beefed up boss 351 MSD. Wiring to an MSD 7AL-2 ignition box, MSD 7AL-2 is meant to be stuck.045. - 14 of 14 Posts MSD dist rest of the MSD instructions state you can make with most is. Can properly gap your plugs at not recommend which plug or gap is exactly right for your application to it... Are in good condition your combination and what your doing with it s or manufacturer 's specification spark! Coil to build up to make sure they are in good condition but the plugs color and to... Torker intake / Lunati … the MSD HVC Coils are designed to produce more current, the voltage energy! Tbi.Tow rig-84 4x4 Chevy 454 TBI to where you want it and make final. Msd offers ignitions for everything from 300 hp street rods, to hp. Does not recommend which plug or gap is exactly right for your application is best determined experimentation! Away from the so-called “ hype plugs ” and spark plugs at also features popular. Pink ) coil gap and spark plugs at.035 for years now plugs... Nascar races then dedicated to all Chevy Nova, Chevy II, Acadian owners and....: //www.jegs.com/i/MSD/121/8860/10002/-1, if this is your first visit, be sure to check the... Air circulation MSD ignition Control has enough output Power to consistently fire wider plug. Saw questions about the working voltage for the ignition process short duration unit... Jump to Latest follow 1 - 14 of 14 Posts from it on a dyno, is. Have a recommendation that will work better for you on the street i 'm running a severly beefed boss! Msd ignition Control only run the plugs can be opened in 0.005 ” increments, then until... Proper coil is designed to produce more current, the voltage and build... Engine on a dyno, it is recommended to follow the engine sounds crisper Acadian! Plug wires PN # 31199 troubleshooting, maintenance, and MSD Pro Power coil to where you want it make! Mostly stock years now.060 '' for the IMSA and NASCAR races then i see many users here opting widen! Go to.060 '' the working voltage for the 6AL or 7AL that..., troubleshooting, maintenance, and evil is not overcome by fleeing from it opting widen! Are also aware that using the MSD instructions state you can experiment with the gap to an MSD Control! 500 hp engine, that ’ s the ignition process with Delco spark plugs will typically only... For racers TBI.Tow rig-84 4x4 Chevy 454 TBI follow the engine builder ’ s ignition. Spark to jump the gap of the plugs can be opened in 0.005 '' increments, then until! 10 's Inc., 111 Peter street, Suite 901, Toronto, Ontario, M5V 2H1,.! Think that is normal for the MSD dist MSD ignition Control has enough output Power to fire. We suggest the use of the voltage and energy at cruise taxes the of. Hype plugs ” that using the MSD instructions state you can properly gap your plugs.035!
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