Resistor plugs

[C M Smith <cmsmith@domain.elided>]

Have a resistor in the plug body. They tend to generate a fatter spark due 
to the delay induced by the higher voltage needed to bridge the resistor. 
Originally they were spark suppression devices to reduce radio 
interference. Nowadays they are often spec'd (always?) for coil on plug 
ignition systems for reasons not clear to me but perhaps a combination of 
the fatter spark and no electrical interference with the ignition 
amplification in the coil on plug system.


Michael Smith
White 1991 164L
Original owner
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