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

Product Information

Colder spark plugs help move heat away from the firing tip and into the engine head. As boost increases there’s more combustion heat, so it necessitates a colder spark plug. We like moving to NGK 1-step colder spark plugs above the 350-400whp ballpark and up to ~450-550whp. Above that power you should consider moving to NGK N54 2-step colder plugs. 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. 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.

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.unlike the 95770 washer that deforms, the solid copper crush washer doesn't function by geometrically deforming once.

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: 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 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.This bulletin is notice of a “limited warranty extension.” This is NOT a notice of a Recall or Service Action. 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. 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

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. deeper into the chamber is a country mile inside of a combustion chamber, and short of getting in the way of the spray pattern, would seem to be a good thing. 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 . 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. 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.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: 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. 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 ceramic insulation for the ground electrode on the 97506 is 5mm wide inside the steel shaft, versus 3.8mm for the 95770. For the above-referenced vehicles, BMW of North America, LLC (“BMW NA”) is extending the limited warranty for the fuel injectors to:

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. These plugs are suggested for most turbo BMW motors including the N20, N54, N55, S55, N63, N63TU, S63, and S63TU applications.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.