Why gap when using a pulley
I recently had a few questions sent to me and wanted to get this out to gather as much information and knowledge for the person. Please correct me as needed.
When changing pulley size the gap of the plugs is frequently looked at to reduce heat. The heat is caused by added pressure in the cylinders from the higher boost. The heat can cause predetonation and this predetonation causes the knock sensor to trigger the computer to retard the timing which is known as Knock Retard or KR.
Therefore a cooler range of plug and gapping reduces the amount of heat and keeps KR from occuring allowing the maximum timing and power from the motor.
00 Regal GS: All kinds of cool stuff.