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

Product Information

Gapping spark plugs is another common topic for good reason. It’s important to have a good spark plug gap for many reasons. Too large a gap can cause misfire issues while too small a gap can reduce air-fuel burn efficiency. So, what is the right gap for N54 spark plugs? Let’s jump in and discuss the importance of spark plug gaps and recommendations for the 135i, 335i, and 535i.

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 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.

Search spark plugs

The ceramic insulation for the ground electrode on the 97506 is 5mm wide inside the steel shaft, versus 3.8mm for the 95770. Anyways, as with the other topics there are some general rules here. N54 spark plug replacement intervals are roughly: 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. So here are some questions I have, and would like to hear any other observations people have as well: 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.

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. When installing the plugs with Precision Raceworks coils on the N55 engine, we recommend setting the gap down to 0.022"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?