Not only can the correct plug choice help your engine run efficiently, spark plugs are also a fantastic diagnostic tool. One plug will run perfectly in one type of engine but be too hot or too cold in a different engine. BavAuto ignition coils & NGK spark plugs vs. OEM ignition coils & BOSCH spark plugs. 100HP Over Stock = 1 Step Colder Plugs. This increased voltage is hard on the rest of the ignition system (wires, coil, amplifier, and distributor cap and rotor). GAP-preset at 0.024" (0.6mm) Iridium alloy has extremely high melting point, perfect for today's high-tech, high-performance engines ... +1 Colder plugs are intended for cars with extreme performance engine mods, Stage 3 Manic Tunes and sustained high RPM track driving running 100+ octane fuel. We suggest the Denso 5346 high performance spark plugs for all factory and tuned 3.3L applications gapped to 0.022". Check air filter. The spark plugs are manufactured for VW/Audi by NGK. Use a spark plug socket (13/16″) and ratchet to remove the spark plug and inspect the ceramic insulator. When you are tuning an engine, it's best to always start off with a cold set of plugs because the only damage you are going to do is to the plug, not your engine. To adjust the gap, thread the spark plug into the gapper tool and measure the existing gap with a feeler gauge. The magnet socket allows you to install and remove the plugs delicately without damage and our gapping tool lets you quickly set the gap without risk of damaging the plug. The ability to read your plugs can be a valuable asset when evaluating the health of your racing engine. The Colortune spark plug is screwed into the engine in place of the normal plug. Effects: At high loads, the glazing becomes conductive and causes misfiring. If you race a limited stock class that requires OEM cylinder heads and allows nothing more than cutting new seats, you might consider indexing the plugs. Excessive Wear on Ground ElectrodeGround electrode is worn down, resulting in excessive plug gap. Spark plugs of a heat range "too cold" can appear black and "sooty," while spark plugs of a heat range "too hot" will cause detonation and the center electrode can look white, brittle, and/or pitted. A plug that is too hot will pre-ignite the air/fuel charge before the plug actually fires. You can then adjust the mixture by tuning the mixture adjusting screw … Remedy: Cleaning glaze off plugs is pointless. The recommended spark plug gap is designed to be adequate for cold starting and smooth driving on a car that is in need of an engine tune up. We have found that NGK makes the best plugs for Hondas, and we use them exclusively. Step 3: Fuel Most tuners advise.025-inch to.030-inch gap under these conditions. Believe it or not, that may be true with a '55 Chevy but less so with a modern racing engine. Loosen and remove the spark plug from the cylinder head with a spark plug wrench. More Boost = Less Gap. This is important in older, stock engines because it helps make up for inefficient combustion chamber and port designs. For some plugs, equivalents with a smaller preset gap are available (e.g. Re: Anyone Know The Spark Plug Gap Jul 29 2020, 8:01am In 2007 Bulletin No. On shorter, more technical tracks, you will need to gear with a rear sprocket large enough to rev just above 16,000. Step 2 Gap the spark plug to 0.026 inches with a … This is commonly felt as a misfire during wide open throttle, and can be cured by gapping down. Remedy: Adjust air/fuel mixture. These substances do not burn as cleanly as the fuel and build up on surfaces in the chamber. Fit new spark plugs with correct heat range. To avoid this, find the spark plug with a heat range that's hot enough to burn off carbon buildup, but not hot enough to cause detonation. Spark Plug Gap Option *. All Magnum tuning parts are tested individually before they ship out. HEI ignitions should be able to run a bit more gap - .045" or so, sometimes more if you have a really hot spark. Indexing plugs is a method of ensuring the open end of the ground electrode faces the center of the combustion chamber (the point of the ground electrode is pointed between the intake and exhaust valves). Maintaining proper spark plug gap is especially important with boosted or high-compression engines, as the additional pressure inside the combustion chamber squeezes more air molecules between the spark plug electrodes—effectively increasing the spark plug "gap.". With this tool you will be able to gap plugs faster and maintain accuracy. Another cause may be that overheating has not taken place. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. You want a full turn of light soot color on the base ring!!! However, if the spark plug stays too hot, it becomes a sort of "glow plug" and can ignite the fuel mixture prematurely. Spark Plug Tuning Tips. When you raise compression or add forced induction (a turbo system, nitrous, or supercharger kit), you must lower the gap (reduce gap about .004" for every 50 hp you add on an V-8 engine, for a Harley-Davidson V-2 engine every 12.5 hp you add). Also, you run the risk of sending the engine into detonation. Your information will be collected and used in accordance with our  Privacy Policy. See all 2 photos. "Hotter heat range" plugs are less likely to "foul" because they stay hotter between combustion cycles and burn off any harmful deposits left behind. On a new spark plug, it starts out white. Pre-ignition leads to detonation (otherwise known as knocking), an extreme buildup of pressure in the combustion chamber that can cause severe engine damage. Mechanical ContactElectrode, insulator, and/or ground electrode show signs of mechanical damage. You can use a tiny screwdriver to carefully scrape the side electrodes clean but do not scrape the center electrode as it’s easy to crack or break the ceramic insulator part. Plug gap should be between 0.018~0.028" depending on the condition of the ignition coils. Ash BuildupHeavy ash buildup on the insulator nose can clog the gap between the center electrode and the ground electrode. Carbon FouledInsulator nose, electrodes, and spark plug shell covered with velvet-like dull black soot deposits. Changing the electrode gap is called a spark plug gapping. Effects: Can lead to auto-ignition with loss of power and possible engine damage. A hot plug uses a large insulator nose area to absorb heat from the combustion process and hold it, while a cold plug has a smaller insulator area and is designed to dissipate the heat absorbed from combustion into the head and cooling system. Remedy: Repair the engine. Your choice in plug selection features different “heat range” spark plugs. The ability to "read" a set of plugs is an old-school skill, but it is still invaluable at the track. Fit new plugs. A smaller gap produces a shorter spark, and a larger gap creates a longer spark that is exposed more to the air-fuel mixture in the combustion chamber. For more info, check out the Bosch Web site. Evo 7/8: Stock heat range: Check plug-to-piston clearance at TDC (top dead center). Insulator tip blistered, spongy, or soft. Move up one heat range at a time until the plug stops fouling and is covered in a thin gray covering after a long run. Cause: Overheating caused by auto-ignition, for instance the ignition being too far advanced, combustion deposits in the combustion chamber, defective ignition distributor, or poor-quality fuel. All my gaps measured .044. Cause: Incorrect mixture setting on carburetor, causing rich condition. If the misfire increases and/or you see little "lighting flashes" around the plug wires, the wires should be replaced or upgraded. 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