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

Product Information

The ceramic insulation for the ground electrode on the 97506 is 5mm wide inside the steel shaft, versus 3.8mm for the 95770. Laser Iridium spark plugs provide superior ignitability and long service life. The smallest tip diameter available ensures slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. 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 Even then it’s best to run the factory gaps and adjust as necessary if you start noticing misfires or other issues. Some people instantly recommend gapping down to 0.022″, 0.020″ or 0.018″. We think it’s too aggressive for most, but there are some general guidelines. Here’s a rough breakdown: This bulletin is notice of a “limited warranty extension.” This is NOT a notice of a Recall or Service Action.

These aren’t exhaustive lists, but a few common BMW spark plugs. Champion are OEM on many newer BMW engines. Bosch and NGK are also common OEM spark plugs for BMW. N54 1-Step & 2-Step Colder Spark Plugs It’s important to have the right spark plug setup on your modded N54 engine. They’re pretty simple parts but play a major role in proper engine operation. With many different considerations it can be challenging to determine the best setup for your BMW. Determining the right N54 spark plugs and gapping isn’t a perfect science, but there are general guidelines to follow. For a B58 Engine with a Stage 1 or Stage 2 tune, you will need the Genuine BMW B58 High Power Stage 1/2 Spark Plugs 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 .These plugs are suggested for most turbo BMW motors including the N20, N54, N55, S55, N63, N63TU, S63, and S63TU applications. Note BMW B58 uses a different NGK part found here. 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.

The factory N55 spark plugs are the Bosch ZR-5-TPP-33 and are a decent option for the N54 too. They’re actually 1-step colder than the N54 spark plugs, so they can help support some extra power. We prefer moving to an iridium spark plug – like the NGK options – at roughly 450-500+whp levels. Even below that we would still opt for the NGK 97968 1-step colder N54 plugs. 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. 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: 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?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.

As you increase boost and power on the N54 you’re increasing cylinder combustion pressures. That leads to more heat than the N54 OEM Bosch spark plugs were designed to handle. In turn that may cause pre-ignition and spark plug overheating. Not good. However, going too cold can cause spark plugs to foul faster than normal. This is because colder plugs may remove too much heat and not successfully burn off deposits. 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?Below we’ll list a few of the best spark plugs for the BMW N54 engine. Many of these are highly proven spark plugs. However, there are other good options that people have success with. As such, this isn’t an exhaustive list of all plugs for the N54 engine. These are simply products we recommend based on personal experience running these on our 2007 335i, 2008 135i, and 2008 535i.