Figure 15-7. Typical Spark Plug Construction and Heat Range Descriptions

Custom Search

Back
Figure 15-6. Ignition Distributor.

Up
TM-9-8000 Principles of Automotive Vehicles Manual

Next
Figure 15-10. Ballast Resistor

TM 9-8000

Figure 15-7. Typical Spark Plug Construction and Heat Range Descriptions

g. Ballast Resistors (Fig. 15-10). A ballast resistor

(3) Some spark plugs Incorporate an auxiliary

(booster) gap In the top terminal. This gap allows the

is used between the ignition switch and the points. It

coil to build a higher voltage and reduce misfiring,

effectively will control primary Ignition voltage to prevent

especially when spark plugs are dirty or fouled. A

premature burning of the points. It contains a resistor

booster gap spark plug is shown In figure 15-9.

element inside of a ceramic casing.

The resistor

element is made of a special material that increases

Figure 15-8. Resistor Spark Plugs

Figure 15-9. Booster Gap Spark Plugs

15-7