Whats the difference between a “hot” spark plug and a “cold” plug?
Spark plugs are typically available in different heat ranges. The plugs that we sell on the NEUSPEED website are suitable for stock engines and mildly modified engines. However, there are times when you might need plug that performs slightly different from our standard listing. “Hot” and “Cold” refer to whether the plug is higher or lower on the heat range scale compared to the standard replacement plug recommended for your car. A Hot plug will typically have more ceramic insulation surrounding the electrode. For example, if you are experiencing some plug fouling, you could move one heat range hotter on the scale to solve the problem. On the other hand, perhaps you have some mild detonation (knocking) due to high boost levels or ignition timing advance. You could move one heat range colder to make sure the heat stored in the electrode isn’t self-igniting your air/fuel mixture early in the compression stroke. The Cold plug will typically have less ceramic insulation surrounding the elec
