The recommended 7/16" gap has always worked for me on outboard motors. As spark path ionizes resistance become zero. According to BMW service sheets, the spark plug(s) on the F650 should be changed every 10,000kms (6,000miles). what does this mean to you? Why does Resistance Matter? You can then also increase engine rpm to verify spark at higher speeds. For example, NGK, Autolite, Champion, Bosch, Denso, AC Delco, will all tell you not to use anti-seize with their modern coated spark plugs. A Taylor ThunderVolt plug wire could easily test at around 40 ohms per foot, which means reduced-resistance and more energy applied to the spark plug. I think the resistive path is related to spark doration. In my drag car, street car nd every engine I build for customers.. 1 of 3 brand plugs goes in it Ac delco (std plug) Autolite (std plug or AR racing plugs for turbo/boosted/nitrous engines NGK (V power tip) I run/use mostly std AC delco plugs … Types of spark plug wires. I want to get some colored wires, but they all claim improved performance but don't define how that is achieved or what actual performance increases there may be. Ac delco (std plug) Autolite (std plug or AR racing plugs for turbo/boosted/nitrous engines . I'm looking at changing my spark plug wires, and am torn between a few sets. If the insulation resistance drops, there also occurs a drop in electrical voltage supplied to the spark plug from the ignition system. Wire 1: 4.8k Ohms Wire 2: 5.5k Ohms Wire 3: 5.5K Ohms Wire 4: 6.2K Ohms The mechanics behind indexing a set of plugs are quite simple. Plug wires and resistance...does it really matter? report. Worst case, this would result in a complete misfire. You could use regular, deep well sockets on spark plugs, but do not do it. (PN 7000014) Anyhow, I figured I would check the resistance of the new wires before I put them on. Second, the slower current flow extends the duration of the spark, ensuring the entire charge is ignited. Did a bonehead thing yesterday :rolleyes: I changed the plugs in my Cig. First, by slowing the current flow it reduces EM static that can interfere with electronic ignitions. Spark plug resistance. have DENSO spark plugs....and have heard they are the best brand...but need to replace spark plug wires, distributor cap now too and need to do it asap....so went to "O Reilley's Auto Parts" and purchased their recommended brand "Import Direct" spark plug wires and distributor cap and etc...is this a good brand or does it really not matter? Changing your spark plug(s) can be an easy task - it just depends on your model of bike and how easy it is to access to spark plug(s). All internal combustion engines have a spark plug, or in the case of diesel engines, a glow plug, to initiate combustion in the engine. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Jump to Latest Follow 1 - 4 of 4 Posts. The spark plug color can provide evidence of what is happening inside the engine. OEM type plug wires are usually a carbon fiber that helps minimize RF noise. hide. They were out of the box right at .035 and I set them at .040. share. By reducing the resistance in the plug wires, the coil does not have to work as hard because less voltage is lost to the resistance between the coil and spark plug. The spark plug is the device that causes the fuel/air mixture in the cylinder to burn. cheap plug wires start gaining resistance in less than a year. A paltry 5KOhms does not do anything when compared to the nearly infinite resistance of the gap itself (until the plug fires that is). Indexing plugs can only be achieved when a conventional-type “gapped” plug is the threaded into the head. Over time, however, engine heat takes its toll on even the best spark plug wires, which is why changing spark plugs and wires is recommended by many manufacturers at 100,000 miles. 14: 29.17%: Yes, the brand matters on how long they last. Over 95 % of American cars were fitted with these, and for good reason, if they were fitted as standard you should try to … Verifying that the electrode gap of the spark plug is facing the air/fuel mixture allows the mixture to ignite more efficiently. Until that happens NO CURRENT FLOWS. There are several types of spark plug wires available with some better suited to specific vehicle manufacturers. This means that the spark must jump the 7/16" gap and the spark plug gap in the motor while running. Vee8ight. If it tells you anything. But for engine power to be generated from this mixture, it needs to be ignited by an electric current. View Poll Results: Does the brand of spark plugs matter? 6. Close. Size matters—but not in the way you think. The readings are as follows. Introduction. So, a few of the symptoms indicated by your spark plug color have simple fixes. It was due for plugs and wires, so I picked up a set of NGK's as well as the NAPA premium (Belden blue) wires. Spark plugs are responsible for producing […] The main difference between them is that one set is 350 ohms resistance, and the others are 500 ohms. Voltage builds in a ramp regardless of how the spark is generated. Whether you have resistance or not does not matter. Archived. Resistance in the spark plug (or wires, or caps) does 2 things. I use mine in line between the spark plug installed normally in the engine and the plug wire. At zero resistance coil discharge is completed. You will break or crack the spark plugs porcelain body. Spark plugs serve a very important purpose for the internal combustion engine. To test the resistance for the secondary coil I'm going to put the positive lead in where the spark plug goes and then I can put my negative lead on to either of the wires for the primary coil. 1. 06-10-2009, 07:32 AM Does the type of spark plug really matters? Discussion Starter • #1 • Jul 17, 2009. Understanding spark plug wire resistance ranges and the application for each type of range is critical when purchasing plug wires. Spark plugs in a gasoline engine have … The spark needs of a stock 216-cubic-inch inline-six Chevrolet are drastically different than those of a supercharged big-block Ford. 1. I'm just curious about the wide range of resistances and whether it matters. As you may very well know, compressed air and fuel are mixed together in the internal combustion chamber. 5k allows for controlled spark doration. 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