An ACDelco Heat Range Chart: What Is It?

A chart that lists the heat rating and other details about ACDelco spark plugs is known as the heat range chart. The heat rating describes the spark plug’s thermal characteristics, or how warm or cool it is.

The plug identification table is described in the chart. It comprises of a numbering system, suffix value, and potential spark plug prefix values. The thread size and the heat range are included in the numbering section.

The chart also includes the construction shape, taper seat kinds, projected gap types, and plug type in addition to the heat rating and thread size. It also includes a single chart with information on the resistor, spark gap, and other design elements.

The heat rating number indicates whether or not the spark plug tends to heat up quickly or has the ability to resist heating up. The heat rating has a range of two to twelve, with two being the hottest and twelve being the coldest.

The long, thin insulator nose of a low heat range or hot spark plug heats up swiftly but does not quickly transfer the heat to the metal shell. As an alternative, a cold or high heat range spark plug features a short, thick insulator nose that readily dissipates heat.

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.

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