Re: Which Spark Plugs?
Posted by Tim Cole On 2011/4/16 10:39:06
Thanks Rusty:
Here is a patent application for Auxillary Gap:
Patent Application #4,549,114
Spark plug for externally ignited internal combustion engine
Abstract
"To increase the spark intensity delivered from a spark plug, an auxiliary spark gap (33) is serially connected with an auxiliary capacitor (37) and the main spark gap (42), the auxiliary capacitor being charged through a charging circuit including a resistor (45) connected in shunt to the auxiliary spark gap (33) and the auxiliary capacitor, and a further or second resistor (46) connected in shunt across the auxiliary capacitor and the ground or chassis electrode (15), and a shunt capacitor (51) is connected between the main spark plug terminal (27) and the ground or chassis or counter electrode (11, 15) so that, upon breakdown of the auxiliary spark gap, the main spark gap will have a voltage thereacross formed by the charge voltage of the main or shunt capacitor (51) and the additional voltage on the auxiliary capacitor (37) which had been charged through the resistors connected across the auxiliary capacitor and to the main spark plug terminal (27) and the ground terminal or electrode (15) respectively."
I don't know if AC plugs have this gadget, but if they don't then maybe that is why they seem to be more durable because this stuff looks like a gimmick that develops opens and shorts.
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