NGK SILZKBR8D8S Laser Iridium Spark Plug (97506 Laser Iridium), 4 Pack

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None of this information applies to the OEM Bosch 3-prong spark plugs. These should not be gapped. Once you reach the need to gap spark plugs you should be running 1-step or 2-step colder single prong plugs, anyways. These include the N55 OEM Bosch plugs and NGK 1 & 2-Step colder. Why Gap Spark Plugs? Can you speak on the impacts of running WMI and how that relates to the spark plug setup? Does WMI sufficiently cool the engine enough to make up for a full 1 step colder? What about gap sizing? I have a set of fresh NGK 97506 (aka BMW N20 -SILZKBR8D8S) plugs. They are very different. Aside from the 97506 being one step colder than the NGK 95770 (5992 if you think in old numbers), there are several differences, shown in the photos below: I'm going to try to be as brief as possible but there are several related things I wish to bring up relative to plugs. I've done reading on Spoolstreet as well as other forum threads, with some success, but nonetheless ...

However, they’re still generally good guidelines to follow. The more boost and heat you generate the more heat you need to move away from the firing tips. There isn’t much need or reason to go overkill and get too cold of a spark plug, either. The following is a specific list of our spark plug preferences: Moving over to a 1-step colder NGK spark plug did seem to help clean up timing and misfires became less common. Exact results can vary from car to car. Still, the OEM plugs can start becoming more problematic too far beyond 400whp. If you’re around that number and aren’t having issues then there isn’t much reason to change things. Discussing spark plugs for the BMW N54 engine can be a lengthy topic. While spark plugs are a pretty simple part they’re extremely important, and there’s a lot that goes into the right setup. How often should you change spark plugs? What are colder plugs and when are they needed? What are the best spark plugs and gaps? None of these question have perfect answers, but there are some general guidelines. In this guide, we discuss some of the best N54 spark plugs, 1-step & 2-step colder, plug gapping, replacement intervals, and more. Pin Spark Plug Heat Ranges

Ultimately, there aren’t perfect answers to any of these questions and sometimes it requires some experimenting. Following the general guidelines won’t hurt, though. We’ve found a lot of these guidelines work well on most N54 spark plugs. The spark plug gap affects the voltage required to jump the gap and actually light the air-fuel mixture in the cylinder. A larger gap requires more voltage. Increasing gap size can actually lead to a more efficient burn since it increases the spark area. However, high cylinder pressures (compression ratio & boost) can blow out the spark if the gap is too large. So here are some questions I have, and would like to hear any other observations people have as well:

Please debate, disagree, call me stupid ... ... I'd like the possibility of getting a bit smarter on all of this. And I'd like my timing corrections to drop - I'm pretty sure my setup is at fault. Okay its gotten to that point where the influx of newcomers to the platform is rapidly rising and there are several common questions that get asked repeatedly and this will focus on a few maintenance items. For the sanity of the veterans to the platform, it is nice to have threads like these to reference. This post will hopefully answer some of those questions and I will update this as much as possible as information evolves. Lets get to it: The ceramic insulation for the ground electrode on the 97506 is 5mm wide inside the steel shaft, versus 3.8mm for the 95770.

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For a customer to request reimbursement for a “qualifying customer-pay repair” performed either by an authorized BMW center or independent repair shop located in the United States (including Puerto Rico), please have him/her submit his/her reimbursement request “online” at www.BMW-RP.com . While colder options may exist the 1-step and 2-step colder spark plugs are the most common choice on the N54. Among the two most popular are the NGK 97968 1-step colder and NGK 97506 2-step colder. These are generally good options even for 600-700+whp builds, which is why we don’t fully agree with the 75-100 horsepower rule. These plugs are suggested for most turbo BMW motors including the N20, N54, N55, S55, N63, N63TU, S63, and S63TU applications. I am boosting up as much as 21 – 22 PSI as I don’t care if the turbos go out because I am planning to go larger. The bottom of all the spark plugs all have some oil residue and carbon by the crush washer ring. Varying amounts up the threads. It took a wire brush to clean them up, including the crush washer face.

NGK is the brand leader in the UK spark plug market and are the world's biggest supplier to many major car manufacturers. Each and every one of their products are designed to meet the most rigorous standards and are the professionals' choice because of their quality and technical excellence. Their plugs can be found in use by teams in F1, WRC and MotoGP. Put simply, NGK genuine spark plugs are the workhorse at the heart of smooth-running engines around the world. Anyways, as with the other topics there are some general rules here. N54 spark plug replacement intervals are roughly: I am running full intake/exhaust, including FMIC, and diverter valves and am catless. I am running a BMS WMI kit with dual nozzle BC 10 Chargepipe injection.When installing the plugs with Precision Raceworks coils on the N55 engine, we recommend setting the gap down to 0.022" What’s your experience with N54 spark plugs & gapping? What do you run and what are your mods, boost, & power? This precision tool is critical to properly and accurately gapping spark plugs. With this tool, you will be able to gap plugs faster and maintain accuracy. Available in 14mm and 12mm plug thread sizes. Made in the USA. There should be NO carbon or oil on the crush washer or the head seating area, yet I have it on multi-install 95770s all torque to spec. I would love someone to debate this as well. Therein lies the need to find the right spark plug gapping for the N54 engine. As we increase boost cylinder pressures thereby increase. In turn, it increases the chance of turbulence and high-pressures blowing out the spark before it can fully light the air-fuel mix. In theory, the best spark plug gap is right on the verge of the highest gap possible without running into spark blow out. Recommended N54 Spark Plug Gaps

Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. FFS you seriously need to do maybe 10 minutes of research before speaking on a subject. You continue to prove over and over again your "20 years" of experience is about as useful as zero years of experience. Please note – power numbers below are rough estimates of where we like each spark plug. For example, some run OEM N54 spark plugs above 400whp without issue while others like to run the NGK 2-step colder spark plugs even at 350-400whp. If your current spark plug setup has been working then there’s not much reason or benefit to changing things. However, if you’re planning to add more power then it is usually a good idea to start considering higher quality, colder spark plugs.This bulletin is notice of a “limited warranty extension.” This is NOT a notice of a Recall or Service Action. Plug gap is relative to your ignition system. A tune is not going to be relevant to plug gap. If you're running iridium plugs DO NOT gap them, you'll break the electrode. If squashing your plug gap (below factory recommendations) improves your drivability then you have a failure in your ignition system and may want to look at new coils. I don't believe I should see any oil or carbon on the spark plug crush washer or head spark plug mating surface. This would seem to indicate that the plug washers are not sealed, correct? All spark plugs remove some heat from the plug tip and transfer that heat to the engine cylinder head. Colder spark plugs are faster and more efficient at transferring heat away from the spark plug tip. Basically when you hear cold plug it means the spark plug transfers heat away from the tip rapidly. Hot plugs are slower at transferring the heat, which means the firing tip remains hotter. There’s overlap in these numbers for good reason. Boost pressures, fuel type, and other factors can affect these numbers. Some N54 engines may be happy with a 0.022″ gap even at 700whp. Others may need a 0.018″ gap before 600whp. The above guidelines are a good starting point, though.