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Engine Systems
Combustion, fuel, ignition, cooling, lubrication.
Question 1 of 50 · engine-systems · L1
On a spark plug, what does the term "heat range" describe?
The voltage required to make the plug fire
The plug's ability to dissipate heat from the firing tip into the cylinder head — hotter plugs retain more heat, colder plugs shed it faster
The maximum exhaust gas temperature the plug can survive
The temperature at which the plug body changes colour
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