I pulled the plugs again and it looks that the plugs are running lean on #3-4 and not too bad on #1-2. Re: spark plug gap vs lean mixtures Post by NewbVetteGuy » Fri Jun 05, 2020 11:34 pm FredWinterburn wrote: ↑ Thu Jun 04, 2020 1:26 am Paschen's law really doesn't apply to ignition systems because the voltage rise is so fast that there is always a voltage overshoot that exceeds the nominal gap breakdown voltage. I might need to ride longer and normal riding to read them better.. You may also need to retard ignition timing, and check vehicle’s cooling system. I like trains. Use common sense and don't do this if it is unsafe. The combustion experiment was carried out under the … Inspect the wires closely and measure their resistance. If your spark plugs are clean and white after being ran in your engine, the air-fuel mixture is lean. It starts, idles and cruises well at light throttle in closed loop but under load fouls plugs and fumes noticeably on the dyno. Spark Plug Chart for Reference: Here is a spark plug chart showing all the different ways to “read” spark plugs. Influences to spark plug temperature Any of the following situations can increase spark plug temperature: -Lean air/fuel mixtures -Increasing compression -Forced induction (Supercharging, turbocharging or Nitrous) -Camshaft change -Advancing ignition timing -Higher engine speed -Higher engine load -Lower air temperature (more dense air resulting in leaner air/fuel mixture) -Lower humidity … Spark plug super clean? Record-running sprint car engine temperatures are typically run at 220°F cooling system temperature. An easy way to tell if your engine is running lean is to look at your spark plugs. Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. If the spark plug is black and oily, they are oil fouled. So. What some of us don’t understand is that the spark plug can tell us a lot of things about our engine. Mixture says lean, plugs rich and Black smoke It is a 6.6L cast iron Bottom end LS1 with a ProCharger 15 psi and a 235/245 cam on 116. A change to a higher octane fuel; a colder plug, richer fuel mixture or lower compression may be in order. What Your Spark Plugs Can Tell You: Spark plugs are the all-important device that delivers necessary Spark to your engine, and when combined with the proper gas-air mixture, provide the necessary combustion to run your motor.. And a spark plug’s condition can provide tell-tale signs about the condition of your engine.. By simply reading spark plugs for wear and deposits, you can quickly … Lean mixtures are just difficult to light with a spark. A spark plug and adapter assembly for an internal combustion engine having an ignition fuel source conduit and plural main combustion chambers supplied with a lean fuel/air mixture, the combustion chambers of the engine having intake, compression, power and exhaust phases, the assembly comprising a spark plug for each main combustion chamber having an elongated body supporting electrodes … Yes, it's running lean, probably 14.6 to 1. This happens because your engine doesn’t ignite the fuel in the … In lean-burn engines the air:fuel ratio may be as lean as 65:1 (by mass). I read … It have to: 1) stay cool enough to prevent pre-ignition 2) stay hot enough to burn off combustion deposits 3) provide spark to ignite A/F mixture. A lot of these symptoms go hand in hand. Do we have an issue with the ignition timing or the oil ring? The correct location to read the plug depends on what throttle range is being checked. Yea you've got detonation mate, could be caused by but limited too: plugs to hot, too lean, too much ignition timming, carbon build up or bad fuel, I'd say there's a good chance your piston/s are now stuffed Current na-t supra making 350 ish, 8.7 second 1/8th mile 500hp na-t build in the works TURBO HIPSTER- was turbocharging N/A cars before it was cool. About the only time you can blame spark plug for a failure, is if too hot spark plug heat range is used and the spark plug ground electrode gets too hot and become a source of the pre-ignition. The sprint car with good oil control and the street engine should both … Join Date: … If your motorcycle does not seem to be running right, take a look at the spark plugs. I am using The NGK 2120 D8EA Nickel Spark Plug My Bike Information 1982 Honda DOHC CB750F Supersport 4-1 Exhaust with baffle Stock intake air box Slow-speed jet #35 Primary main jet #68 Secondary main jet #105 Ventura, California … Gasoline engines rely on the spark plug to deliver the “spark” that will ignite the air-fuel mixture in the combustion chamber. It wasn't the "perfect" spark plug but it wasn't showing an indication of lean running. Worn electrodes After 50,000 miles or so, OEM carbon-core ignition wires develop too much internal resistance, which weakens the spark and increases the risk of misfire. Shown below, unleaded fuel leaves a light tan near the bottom of the insulator to indicate the A/F ratio. Cal. Too hot a spark plug, low octane fuel or lean air fuel mixture. Also, too high compression, or insufficient engine cooling. 4. Step 3- Inspect the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away. High-mileage plug wires also can develop cracks that leak current to ground or to other wires, shorting the spark before it can reach the plug. Blisters on the insulator tip, melted electrodes, or white deposits are signs of a burned spark plug that is running too hot. Lean-burn refers to the burning of fuel with an excess of air in an internal combustion engine. Abnormal … Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. … Just to be clear a "misfire" with a lean mixture does not necessarily mean the spark plug didn't fire a spark across the gap, it means the mixture didn't light. By carsonxt, September 1 in Kawasaki 2 Stroke. I noticed half of the ring of spark plug is dry black while the other is just a tanish color. Lean running conditions: If your engine is running too lean, the spark plug will be white. Pre ignition most often leads to detonation. When I got a new pipe for my two stroke Kawi, I leaned the jets out a tiny bit. A plug chop will tell you how your engine is running a certain throttle positions. Black sparks indicate that the temperature of the combustion chamber is too low. At very lean mixtures you can fire the plug all day long with any ignition system and gap you care to use and the mixture will not light, ever. Consequently, pre ignition and detonation are two … Prev; 1; 2; 3; Next; Page 1 of 3 . Spark plug wet and smell like gas? To further improve the lean limit of engine combustion, the influence of the spark plug orientation on the combustion stability under lean operation should be explored. The excess of air in a lean-burn engine emits far less hydrocarbons. Clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug. In comparison, high-performance racing engines on the street are usually not run over 200°F cooling system temperature. The Kawasaki’s come rich from the showroom so with a new pipe I thought might as well lean it out. Post Cancel. carsonxt carsonxt TT Member; Members; 57 posts; Location: Texas; Posted September 1. Make sure you clean all parts as much as possible to ensure the plug works properly. Conversely, lean spark plug indications from excess engine heat can actually be made with a rich alcohol fuel mixture. Before analyzing the difference between lean and rich fuel mixture, it is important to know more about the air … Comment. Head gasket leak causing coolant to steam clean the plug. If the "color" of the ground strap "changes" too close to the ground strap's end, (which is above the center electrode), then the heat-range is "too cold" , meaning that the strap is loosing heat too quickly to the base ring, and is not able to burn off deposits until near its end. Id rate it 6 out of 10 for health. This happens if the ratio fuel/air is too high. Step 4- Check the spark plug gap and adjust as … Jenga. Mixtures that cause the plugs to read lean might contribute to preignition or detonation. These are some of the things that a spark plug can tell us. Fuel tuners are available (albeit illegal for street) they range in type and run from $100 (load based) to $1000 (complete ECU replacement with dynamic self, auto tuning features.) Recommended Posts. Whenever you are rejetting or tuning your carburetors, a plug chop can take away a lot of the guess work. High air–fuel ratios can also be used to reduce losses caused by other engine … Posts: 6,301. Update: Is spark … These features — advanced ignition of stoichiometric and lean mixtures and decreased lean flammability limits — might qualify the pulsed energy plugs as an enabling technology … If the "color" of the strap changes near where it is … Retuning to a 12.5 - 13 to … If any of these conditions exists, replace the spark plug. Fox Scoot Master! Additionally, the pulsed energy plug demonstrates a decreased lean flammability limit that is about 14% lower (0.76 for conventional plug and 0.65 for pulsed energy plug) than that of the conventional spark plug. 2. After I shut it off and took it out. If your spark plug has started to look white in colour, this indicates that something is making the plug run too hot. However, it is nice to know the most important tell-tale signs to look for on spark plugs. Are we running lean or too rich? The key difference between lean and rich fuel mixture is that we use a lean mixture for maximum efficiency while we use a rich mixture for maximum power in an engine.. We use the terms lean and rich fuel mixtures to describe combustion processes in engines and industrial furnaces. A spark plug having means for concentrating a portion of the fuel mixture in the spark gap during the compression cycle of an internal combustion engine and means for increasing the burn rate of the fuel mixture upon ignition, thereby providing positive ignition of a lean fuel mixture without decrease in the horsepower output of the engine, as otherwise would be the case. If your bike is fuel injected and newer, (2006 and up) white plugs means it's running as intended by the manufacturer and in accordance with the EPA. So he thought of having a look at his spark plug to see the colour which we expected to be white or really clean as an indication of lean running but somehow his spark plug had a really light brown colour. I changed out a new spark plug and drove with the new spark. White means main jet is too small (lean) and black means main jet is too big (rich). Hey guys, here is a update of my post regarding if my 2014 taotao thunder is lean or rich. Normal rates of gap growth are as follows: Four-Stroke Engines: 0.01~0.02 mm/1,000 km (0.00063~0.000126 inches/1,000 miles) Two-Stroke Engines: 0.02~0.04 mm/1,000 km (0.000126~0.00252 inches/1,000 miles) Abnormal Erosion. This is more of an old-school mechanic test. A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap (due to erosion) requires higher voltages. Lean Spark plug? As such, it is … No spark or the plug is broken (cylinder is getting … I don't if fuel type has to … Causes can include the engine overheating, incorrect spark plug heat range, a loose spark plug, incorrect ignition timing or too lean of an air/fuel mixture. Spark plug is passive component with 3 basic functions. In this investigation, the original machine spark plug orientation, 90 degrees clockwise rotation, and 180 degrees clockwise rotation are studied to analyze the impact of spark plug orientation. Clean the spark plug Use the sandpaper to clean the dark coating off the plug by rubbing it against the centre electrode (the bump that sticks up from the centre), and the side electrode (little arm above the bump). Each different spark plug color is a clear indication of a specific engine-related problem. I told him that he was running lean and that he needed a fc. The rule of thumb is light brown or tan colored … Unleaded fuel and ethanol fuels like E85 … Set the proper spark plug gap Each spark plug has an optimum gap that should be maintained for … The plug shown in the middle is the correct color. If you notice your engine misfires, you’ll likely also notice you have poor fuel economy. Can you tell me if my scooter is lean or rich thanks for your help. If your … The spark plug should be replaced. The air / fuel ratio needed to stoichiometrically combust gasoline, by contrast, is 14.64:1. Reduce Gas Mileage. Spark Advance: Ignition timing has one of the greatest effects on heat-range choice. Step 2- Remove the spark plug using a spark plug socket. Bad spark plug wires are another common cause of misfires. Plugs to read them better fuel mixture or lower compression may be in order internal combustion engine go hand hand. Be as lean as 65:1 ( by mass ) it starts, idles and cruises well at light throttle closed! 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