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. 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. One thing you can do to improve performance is by indexing your spark plugs. Third, I would put a fresh set of ignition wires with low resistance (.50 ohms per foot or less) and good noise suppression. This can result in engine hesitation. 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. Conversely, if the spark plug gaps are too big, the spark can get blown out at high speeds. If the gap is too narrow, the spark may be too weak to ignite the fuel/air mixture. It is MSD HEI Pro-Billet distributor coil on top. The reason Iâm 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. Not sure on the model but the wires are MSD 8mm. My car is an N54 with 335cid engine. What makes the heat range of the spark plug available important is the reliability and longevity of the spark plug. What happens if my spark plugs arent gapped correctly? We run an MSD Pro Billet distributor. âIf itâs a mildly tuned engine it may not matter; the ignition system will usually do the jobâespecially if itâs ignited by a capable ignition box and coilâeven though it has to work harder. What happens when spark plug gap is too big? 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. 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. My vehicle requires a 0.054" spark gap. The spark jumps from the tip of the center electrode to the edge of the shell that screws into the cylinder head. The gap between the center and side electrodes of a spark plug must be an exact distance; otherwise, your plugs don’t fire efficiently. What do you do with the Big Poe in Majora's Mask? And then you’ll have a working car and a new hobby. Are you running an MSD HEI-type distributor (with the coil mounted on the cap)? Itâs even tougher if the engine is fueled by alcohol where larger volumes of fuel are involved, âOften racers come to the MSD trailer with the same issue: the car wonât rev on the straightaway or it wonât come up to the rev limiter,â says Brock. Second, I would ground the heads by running a ground wire (18 gauge) from head-to-head to a good chassis ground. Iridium spark plugs require much less energy from the coil in order to fire the spark plug. But this also reveals a weakness in the ignition system and at this point they realize they need a better coil.â, âMost engine builders know about plug gaps. As you can see this gap is about .002" larger than what we need. Here is his response. You’ll have to check the spark plug box to see if the spark plug has been gapped for your particular project. Can spark plugs give you more horsepower? Too wide of a point gap can lead to a weak spark. Often theyâll tell me itâs 0.045 or 0.050in. What happens if spark plug gap is too narrow? 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. 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. Use a feeler gauge to check the gap of the spark plug. 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. Spark plugs that are not gapped properly will cause the engine to either skip firing, or ignite too soon in the compression stroke. If not, what coil are you using? Conversely, if the spark plug gaps are too big, the spark can get blown out at high speeds. You can buy a gapping tool at your local auto parts store for less than $10. The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. 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. The result is an engine that will run inefficiently or rough. 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. Terry, No rubber on the motor mounts, so I’m going to assume the heads are grounded to the chassis like everything else. The amount of air and turbulence in the cylinder increases as the speed of the engine increases. Spark Plug Type Matters. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency. One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. Where do donations to Big Brothers Big Sisters go? What's the difference between Koolaburra by UGG and UGG? Iâm not using a 6AL box; it’s not allowed in Wissota B Mod. Engine Hesitation An engine that hesitates, or stumbles, upon acceleration is often the result of incorrectly gapped spark plugs. 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. How much does it cost to play a round of golf at Augusta National? Therefore, having iridium plugs with fresh (new) coils and a somewhat small plug gap (.039) is more than adequate for a stock engine. This is basically ensuring the gap is facing towards the combustion chamber, which promotes flame development inside the combustion chamber. All brand spark plugs have models, usually at the end of the model, using numbers or letters to represent clearance values. By nature, circle track cars are bombarded by mud and then blasted with water in the car wash. Also if thereâs 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. The spark is made by ionisation of the gases in the combustion chamber. 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. So you only have a couple options to try to increase spark energy across the plug gap. If the gap is too big, then the spark may struggle to jump the gap at all. An incorrect electrode gap may affect engine performance as the spark magnitude may be insufficient to ensure complete combustion of the air-fuel mixture. How many days it will take to learn MySQL? Which ignition wires are you using? As a test, you can try closing the gap to about 0.030 and see if you notice a difference. Multiple electrode plugs like E3 are vehicle specific and gapped at the factory. I reduced the compression ratio of my stock engine from 10.2:1 with a 0.022in plug gap to 9.4:1. Run the wire between the two electrodes of the spark plug. The amount of air and turbulence in the cylinder increases as the speed of the engine increases. Its unlikely you will experience a noticeable difference. Fortunately, spark-plug gaps can be easily adjusted by mechanics, including many amateur d… Either the AFIS 8.5mm or MSD 8.5mm wires are an excellent choice. This can result in engine hesitation. Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. The size of the gap affects the spark plug's firing temperature which in turn is … Generating a spark that’s compelled to jump a wide plug gap is inviting trouble. Excessive spark plug gap also happens as result of normal electrode wear and age. The customer may experience loss of power, misfires, spark plug fouling, increased plug wear, or poor gas mileage. You need a feeler gauge to gap your spark plugs properly. Does anyone recommed a good spark plug manufacturer as well. Choosing the right spark plug is also very … They also lose output as battery voltage drops. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. Erik Brock is now with HPL Oil, hence, no longer at MSD. âWhen you increase compression or cylinder pressure by adding boost or nitrous the plug gap has to be reduced accordingly. If the gap is too big, use the broad side of the gap tool to push the electrode down and make the gap smaller. The first step is to figure out the size of the gap that your vehicle requires. Widen the gap, if necessary, by hooking the gauge on the ground electrode and tugging gently. The talk was plug gaps of .060″. Does the OE require iridium plugs? 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