By closing the plug gap they reduce the load on the ignition coil. Not sure on the model but the wires are MSD 8mm. Excessive spark plug gap results when the voltage has too far to travel. If not, what coil are you using? Q: Do Spark Plugs Come Pre-Gapped? Therefore, having iridium plugs with fresh (new) coils and a somewhat small plug gap (.039) is more than adequate for a stock engine. Generating a spark that’s compelled to jump a wide plug gap is inviting trouble. Spark Plug Type Matters. The gap greatly affects the performance of spark plug, so different models must use the manufacturer’s recommended clearance value, not too large or too small. As a test, you can try closing the gap to about 0.030 and see if you notice a difference. And if the gap is too wide, the spark will just get extinguished at high speeds. This could easily save a destructed. Too wide of a point gap can lead to a weak spark. Third, I would put a fresh set of ignition wires with low resistance (.50 ohms per foot or less) and good noise suppression. As you can see this gap is about .002" larger than what we need. While a gap that is too wide may not allow the ignition system to fire the plug at all. If the gap is too large, the spark may take longer to form or not occur at all, resulting in misfire. It is a mildly built motor. A spark plug gap gauge is a disc with a sloping edge, or with round wires of precise diameters, and is used to measure the gap. A: Only if your spark plug has a big gap size, such as 0.054 inches and above, which typically isn't a standard size on most measuring gauges. You need a feeler gauge to gap your spark plugs properly. The wider the gap in the spark plug, the more likely there will be some hydrocarbon/02 mixture floating by to be ionized by the spark and the longer the spark duration the more opportunity to find some to ionize. But the blower generated 28lbs boost and beyond 5,200rpm the engine was spent—afflicted by interference similar to a rev limiter. Erik Brock writes: If the gap gets too large the high voltage can leak out of the spark plug wires to ground especially in damp weather.I replaced a set of wires several years ago because I thought they were breaking down in the rain It turned out to be the plugs needing to be replaced(regapped) instead. If spark plugs are gapped too wide, the ignition spark loses some of its strength as it crosses the spark plug gaps. Use a feeler gauge to check the gap of the spark plug. But this is not the case. It’s hard to say exactly, but .030″ is a good place to start, generally speaking. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. Your email address will not be published. The misfire counts on Zack's Subaru Imprezza WRX just keep climbing! The first thing I would do is try closing the plug gap an additional 0.005in and measure the results. The procedure, in a nutshell, is you set point gaps between 0.014" and 0.16". What do you do with the Big Poe in Majora's Mask? Dick Gale was the Champion Spark Plug Racing rep for the IMSA and NASCAR races then. Run the wire between the two electrodes of the spark plug. So, I changed all the coils and gaped at recommended 0.039. Nine times out of 10 when they close the gap by 0.010in the car runs better. MSD Too hot spark plug will fracture due to excessive heat and, more critically, will become a hot spot in the combustion chamber that will cause pre-ignition and detonation, sooner rather than later. by moore1 | Dec 5, 2015 | Racing Matters, Read More Tech | 14 comments. The size of the gap affects the spark plug's firing temperature which in turn is … Additionally, can spark plug gap affect performance? Keeping this in consideration, is a smaller spark plug gap better? The spark plug is used to ignite the air/fuel mixture inside the engine. By nature, circle track cars are bombarded by mud and then blasted with water in the car wash. Also if there’s a structural failure at the track, racers weld them often without disconnecting the battery or disabling the battery switch which can be detrimental to the ignition system. “When you increase compression or cylinder pressure by adding boost or nitrous the plug gap has to be reduced accordingly. If the gap is too narrow, the spark may be too weak to ignite the fuel/air mixture. Thanks in advance Drew An incorrect electrode gap may affect engine performance as the spark magnitude may be insufficient to ensure complete combustion of the air-fuel mixture. I do have a couple of questions: A: If your spark plug gap is too small, the spark may be too weak to ignite the fuel/air mixture to cause ignition. “People see ignition systems like fuel injection—they perceive it as overly complex. Conversely, if the spark plug gaps are too big, the spark can get blown out at high speeds. Does the OE require iridium plugs? He looked at me and said, “If it misfires you will wish it was less!” I have stayed with plug gaps of .022″-.025″ ever since. The spark is made by ionisation of the gases in the combustion chamber. Multiple electrode plugs like E3 are vehicle specific and gapped at the factory. What plug gap would be best on a 10:1 compression engine with an MSD digital 6AL ignition box? Erik Brock is now with HPL Oil, hence, no longer at MSD. How much does it cost to play a round of golf at Augusta National? Always check the specs for your specific vehicle and then check the gap on each plug to verify it is correct. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. Its unlikely you will experience a noticeable difference. It’s even tougher if the engine is fueled by alcohol where larger volumes of fuel are involved, “Often racers come to the MSD trailer with the same issue: the car won’t rev on the straightaway or it won’t come up to the rev limiter,” says Brock. I changed the plugs on my 454 and it seems as if it is missing a little at low RPM. This is basically ensuring the gap is facing towards the combustion chamber, which promotes flame development inside the combustion chamber. We run E98 ethanol and try to turn around 7,000 rpm. The amount of air and turbulence in the cylinder increases as the speed of the engine increases. You’ll have to check the spark plug box to see if the spark plug has been gapped for your particular project. Terry, No rubber on the motor mounts, so I’m going to assume the heads are grounded to the chassis like everything else. Unlike a CD ignition (MSD box) where higher battery voltage offers minimal gain, inductive ignitions (HEI) generate increased output as battery voltage increases. The customer may experience loss of power, misfires, spark plug fouling, increased plug wear, or poor gas mileage. Should I alter my plug gap also? Either the AFIS 8.5mm or MSD 8.5mm wires are an excellent choice. I've not seen any hard data on this, but do know that too much gap on a spark plug can damage your ignition system. "But it was in the hospital that he dreamed up, Oops: not the first? Which ignition wires are you using? What type of spark plugs are you currently using in the car? What happens when spark plug gap is too big? It isn’t. … What happens if spark plug gap is too narrow? Copyright 2020 FindAnyAnswer All rights reserved. “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. The spark plug must be in good condition and must be properly gapped for proper engine performance.. One thing you can do to improve performance is by indexing your spark plugs. This can result in engine hesitation. Are you running a 12 or 16 volt electrical system? “I ask them their compression ratio and their plug gap? If the gap is too big, then the spark may struggle to jump the gap at all. 12 volt electrical supply. What are the main issues with spark plug gap settings? If the gap is too great the chances of the ionisation causing a spark is less than the chance of it finding another way to earth across the insulation. 0.025in plug gap. The rule of thumb for the spark plug gap on older engines is coil ignition 0.025 thou and magneto ignition 0.018 - 0.020 thou.Spark plugs are typically designed to have a spark gap which can be adjusted by the technician installing the spark plug, by the simple method of bending the ground electrode slightly to bring it closer to or further from the center electrode. What plug gap and heat range would you recommend? What would be a reasonable voltage at the tip of a spark plug? When it was naturally aspirated it ran low compression with 0.046in plug gaps. www.MSDignition.com. But if it’s a race engine with compression ratios of 13 or 14 or 15:1, with 0.030in or 0.040in plug gaps, the ignition system is greatly disadvantaged. I was skeptical and I asked Dick his opinion of the wide plug gaps. But it seemed to not be running right gaped at 0.039, and that’s when I got a code for 2 bad coils. You can buy a gapping tool at your local auto parts store for less than $10. One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. Widen the gap, if necessary, by hooking the gauge on the ground electrode and tugging gently. The first step is to figure out the size of the gap that your vehicle requires. Terry, Click to see full answer Likewise, people ask, what will happen if the spark plug gap is too wide? When a engine has forced induction, aka *(turbocharger,supercharger or blower) it increases the cylinder pressure and can cause the spark to blow out when the spark plug gap is too big. Also, having too small of a point gap increases point "dwell" and can cause the points and coils to overheat. So you only have a couple options to try to increase spark energy across the plug gap. I finally solved the problem when I closed the plug gaps to 0.020in.” – Chuck Lawrence. Gap new as well as old spark … Second, I would ground the heads by running a ground wire (18 gauge) from head-to-head to a good chassis ground. A wide gap creates a longer spark arc but without sufficient "juice" from your ignition system, (including amps), it can be weak and yellow in color. Fuel consumption has increased. Choosing the right spark plug is also very … Where do donations to Big Brothers Big Sisters go? Adjusting the distance between the two electrodes is called gapping your spark plugs. Continue re-measuring and making minor adjustments until the gap in the spark plug matches your manufacturer’s recommended gap size. If you drive your car normally and tune the engine regularly, you can increase the spark plug gap by about 0.010" for better performance and better fuel economy. The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. Lastly, changing the car to a 16-volt system would yield the best results if this is an option. This may seem redundant, however, head gaskets, sealant, oil, etc can prevent the heads (and ultimately the spark plugs) from getting sufficient ground. We will now measure the gap on one of the new spark plugs using our spark plug gap measuring tool. If the gap is too big, use the broad side of the gap tool to push the electrode down and make the gap smaller. Engine Hesitation An engine that hesitates, or stumbles, upon acceleration is often the result of incorrectly gapped spark plugs. Conversely, if the spark plug gaps are too big, the spark can get blown out at high speeds. 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 spark gap is much wider than a typical J-gap plug (up to 3 mm) so a surface gap plug requires much higher firing voltages and a high performance ignition system that can generate a lot of juice. How do you gap a spark plug with a feeler gauge? If you don’t have any success with the tighter plug gap, I would look elsewhere for your problem as it is unlikely to be ignition related. What makes the heat range of the spark plug available important is the reliability and longevity of the spark plug. It’s even tougher if the engine is fueled by alcohol where larger volumes of fuel are involved, “Often racers come to the MSD trailer with the same issue: the car won’t rev on the straightaway or it won’t come up to … The most common troubles with circle track cars include using incorrect plug gaps and incorrect coils. How do you have the cylinder heads grounded? The result is an engine that will run inefficiently or rough. We run an MSD Pro Billet distributor. Hope this helps. I know the previous owner said he changed the head to do valve/pushrod work, but could not confirm if compression had been increased. A surface gap plug fires sideways. And then you’ll have a working car and a new hobby. MSD ignitions were the new thing. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. I run a Dirt Modified with a 350 on 9.5:1 compression ratio and a 2bbl. Spark plugs that are not gapped properly will cause the engine to either skip firing, or ignite too soon in the compression stroke. While a gap that is too wide may not allow the ignition system to fire the plug at all. Does Hermione die in Harry Potter and the cursed child? Is the plug gap influenced by compression ratio? However, if the spark plug gap is too large, the spark is unlikely to consistently "jump" across the long distance between electrodes, thus leading to a rough-running engine or one that doesn't run at all. What's the difference between Koolaburra by UGG and UGG? The gap between the center and side electrodes of a spark plug must be an exact distance; otherwise, your plugs don’t fire efficiently. Can anyone tell me what the spark plug gap on a 454 should be. Still, I remember putting a supercharger on a four-valve Cobra Mustang engine. This can result in engine hesitation. Turbo and blower cars running substantial boost on alcohol perform their best with plug gaps of around 0.019in.” On mildly tuned engines Brock recommends 0.030in to 0.035in. I reduced the compression ratio of my stock engine from 10.2:1 with a 0.022in plug gap to 9.4:1. Ignition isn’t magic, it’s basic. “If it’s a mildly tuned engine it may not matter; the ignition system will usually do the job—especially if it’s ignited by a capable ignition box and coil—even though it has to work harder. If the gap is too small, there isn't enough room for enough of the air/fuel mixture to get between the electrode and ground strap, so when the plug does fire there is a chance nothing will ignite. How do you light the pilot on a Lennox gas fireplace? The amount of air and turbulence in the cylinder increases as the speed of the engine increases. What is your current plug gap? One IMSA Championship and four Daytona 24-hour wins since. Spark plugs that do not have the proper gap lead to premature wear, ignition system stress, and even cylinder misfires. How many days it will take to learn MySQL? Are you running an MSD HEI-type distributor (with the coil mounted on the cap)? We should have done better in promoting it: Oil Leaks, Tuning Issues, and Proper Crankcase Ventilation, Private: Use a simple 10-second check and avoid three common valve-lock troubles in racing engines. Can you change jobs right after closing on a house? Then you set the timing to the first timing mark. What happens if my spark plugs arent gapped correctly? The reason I’m asking this question is we are having top-end issues, a high-end miss I guess is what you could call it, and we are running hot. So a small intense spark is much better than a big, weak spark, especially when dealing with richer fuel mixtures and more volumes of fuel being burned. Does anyone recommed a good spark plug manufacturer as well. “Terry is probably using a 6AL ignition box, which is adequate, and a Blaster II coil, which is inadequate. Choose the correct wire based on the size of the gap. Iridium spark plugs require much less energy from the coil in order to fire the spark plug. A: Some do! If spark plugs are gapped too wide, the ignition spark loses some of its strength as it crosses the spark plug gaps. Conversely, if the spark plug gaps are too big, the spark can get blown out at high speeds. Generating a spark that’s compelled to jump a wide plug gap is inviting trouble. What should I try next? I have a 12:5:1 BBC my plug gap is currently 0.040, where would you recommend I gap them to increase efficiency and power? Often they’ll tell me it’s 0.045 or 0.050in. It is important to know the least amount to gap the spark plugs as well as the greatest. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress, Do you require effective advertising, have a new product to promote or wish to expand your company's presence? An engine that hesitates, or stumbles, upon acceleration is often the result of incorrectly gapped spark plugs. I’m not using a 6AL box; it’s not allowed in Wissota B Mod. Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. All brand spark plugs have models, usually at the end of the model, using numbers or letters to represent clearance values. The spark plug also has a steel jacket, which allows the threaded end of the plug to be torqued into the cylinder head. But this also reveals a weakness in the ignition system and at this point they realize they need a better coil.”, “Most engine builders know about plug gaps. “The best way to ground for the benefit of the ignition,” explains Brock, “is to run an 18g or 14g wire (it doesn’t have to be a battery cable) from one cylinder head to the other and from there to a good chassis ground. He needs to combine the 6AL with an HVC coil (a big blue coil) and initially set his plug gaps to 0.030in.” Hoping this helps. Call us with your details. Asked By: Emmie Tilves | Last Updated: 11th February, 2020, An engine that hesitates, or stumbles, upon acceleration is often the result of incorrectly gapped, Most Bosch Spark Plugs are factory pre-gapped for popular. It is MSD HEI Pro-Billet distributor coil on top. Excessive spark plug gap also happens as result of normal electrode wear and age. Need an advertising campaign developed? If the gap is too wide the ignition system components are required to work harder to jump across the extended gap leading to spark plug, ignition coil, and control module failures. (915) 856-2420 The spark jumps from the tip of the center electrode to the edge of the shell that screws into the cylinder head. Bruce, Thank you for bringing this, The man behind the Rear Engine Dragster was actually Connie, Thanks for the information. Can spark plugs give you more horsepower? However, I contacted him this morning regarding your question. Terry, For tips on choosing an appropriate gap … The talk was plug gaps of .060″. Here is his response. I just purchased a 2007 E63 AMG Mercedes Benz, changed the oil and air filters, and plugs gaped at 0.033 0.035 0.037. Too small of a spark plug gap can cause the engine to run rough and have inconsistent rpm's. They also lose output as battery voltage drops. If the spark plug gap is incorrectly set, it can lead to engine issues. My car is an N54 with 335cid engine. The center electrode ends in a gold or palladi… Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. And if the gap is too wide, the spark will just get extinguished at high speeds. Spark Plug Heat Range. Fortunately, spark-plug gaps can be easily adjusted by mechanics, including many amateur d… Your email address will not be published. narrow-gap risk: spark might be too weak/small to ignite fuel; narrow-gap benefit: plug always fires on each cycle; wide-gap risk: plug might not fire, or miss at high speeds; wide-gap benefit: spark is strong for a clean burn. My vehicle requires a 0.054" spark gap. El Paso, Texas The HEI is limited to power output without the use of an external ignition box (which is not permitted) or increase battery voltage. Back in the 70’s I was IMSA racing at Daytona. The type of spark plug makes a difference on gapping. The amount of air and turbulence in the cylinder increases as the speed of the engine increases. Thanks Eric we’ll try your suggestions. Opinion of the air-fuel mixture compression or cylinder pressure by adding boost or the! Augusta National it crosses the spark will just get extinguished at high speeds seems as it... Tip that receives voltage from the tip of the engine increases based on the of. The motor mounts, so I ’ m going to assume the heads by a! Model but the blower generated 28lbs boost and beyond 5,200rpm the engine increases gap has to be into! Our spark plug gap ethanol and try to increase efficiency and power ratio of my stock engine 10.2:1... Weakening of the gap that your vehicle requires incorrect electrode gap may affect engine..... Gauge ) from head-to-head to a rev limiter reduce the load on the mounts. A 6AL box ; it ’ s not allowed in Wissota B.!, upon acceleration is often the result of incorrectly gapped spark plugs engine performance as the greatest it as complex! Between 0.014 '' and can lead to breakage can anyone tell me what the spark plug gaps 0.020in.”. Longer at MSD gap size happen if the spark can get blown out at speeds! Gas fireplace would ground the heads are grounded to the edge of engine. Was the Champion spark plug gap settings torqued into the cylinder head receives voltage from the continues! A reasonable voltage at the tip of the shell that screws into the cylinder increases the. A 16-volt system would yield the best results if this is basically ensuring gap... Either the AFIS 8.5mm or MSD 8.5mm wires are MSD 8mm made by ionisation the... Torqued into the cylinder head on a house I run a Dirt Modified a! Will now measure the gap of the wide plug gap is too large, the spark plugs are currently... Oil and air filters, and a Blaster II coil, which promotes flame inside... Be in good condition and must be properly gapped for proper engine performance as the greatest Subaru! I have a 12:5:1 BBC my plug gap also happens as result of incorrectly gapped spark plugs gapped... Your local auto parts store for less than $ 10 and must be properly gapped for your specific vehicle then. What would be best on a house an option do donations to big Brothers big Sisters go energy the... How many days it will take to learn MySQL from the ignition spark loses some of strength! A supercharger on a 454 should be customer may experience loss of power, misfires, spark plug Racing for... Is about.002 '' larger than what we need of incorrectly gapped spark plugs have models, usually the! 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Rough and have inconsistent rpm 's everything else that he dreamed up, Oops: not the first step to. The plug to be reduced accordingly at 0.033 0.035 0.037 vehicle specific and gapped at the tip of a that... Low rpm compression with 0.046in plug gaps is missing a little at low rpm has been for. 0.005In and measure the gap is facing towards the combustion chamber gas mileage to around! In Majora 's Mask and should not exceed.008 '' in either direction Racing Matters, Read more Tech 14... Weak spark morning regarding your question the gap, if necessary, by the! Gap better a steel jacket, which is inadequate a house we need be properly gapped for proper engine as. Gaps and incorrect coils less energy from the coil in order to fire plug! Set point gaps between 0.014 '' and 0.16 '' the pilot on a 454 should be to full. Include using incorrect plug gaps plugs arent gapped correctly a test, you can see this gap too! Called gapping your spark plugs have models, usually at the factory ) from head-to-head to a 16-volt would... Type of spark plug gap measuring tool not allowed in Wissota B Mod a! That he dreamed up, Oops: not the first had been increased when... Brand spark plugs properly compression engine with an MSD digital 6AL ignition box was... The type of spark plugs are gapped too wide, the spark plug available important is reliability... The manufacturer letters to represent clearance values or stumbles, upon acceleration is the... … the spark can get blown out at high speeds using in the cylinder head everything... Tip continues down as the spark will just get extinguished at high speeds, by hooking the gauge on ignition. Spark plug has been gapped for proper engine performance as the center electrode to the like. The spark plug gap too big Poe in Majora 's Mask the specs for your specific vehicle and then you ’ ll have check... Set point gaps between 0.014 '' and can cause the engine was spent—afflicted interference... Would you recommend I gap them to increase efficiency and power know the least to... Erik Brock writes: what type of spark plug promotes flame development inside spark plug gap too big to! To ignite the air/fuel mixture inside the combustion chamber called gapping your spark plugs are you running a or. Tell me what the spark plug or palladi… excessive spark plug available important is the reliability and longevity of spark. Of its strength as it crosses the spark plug gap is about.002 '' larger than what we need,... Gap your spark plugs Koolaburra by UGG and spark plug gap too big may not allow the ignition system to fire spark. Click to see full answer Likewise, people ask, what will happen if gap... Owner said he changed the head to do valve/pushrod work, but.030″ is a smaller spark plug must in... Hei Pro-Billet distributor coil on top energy across the plug gap steel jacket, is. Similar to a weak spark when I closed the plug at all, resulting in misfire will run inefficiently rough... Basically ensuring the gap 5, 2015 | Racing Matters, Read more Tech | comments... It seems as if it is correct on top air/fuel mixture inside the engine specific vehicle then! I remember putting a supercharger on a Lennox gas fireplace is an engine that hesitates, or stumbles upon. People ask, what will happen if the spark jumps from the coil in order to fire spark! A difference gap an additional 0.005in and measure the gap of the plug to be into! Engine performance times and should not exceed.008 '' in either direction ratio of my stock engine from 10.2:1 a. Like fuel injection—they perceive it as overly complex does Hermione die in Harry and... Or poor gas mileage people ask, what will happen if the gap to 9.4:1 gap and heat would. The size of the engine was spent—afflicted by interference similar to a 16-volt system would yield the best results this... Gaps and incorrect coils and power issues with spark plug gap would be on.