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The different types of spark plugs in my collection
Design and variations
Spark plugs built to keep the oil away
A great deal of the older spark plugs was built to, in one or another way, avoid clogging up with oil and soot, or they were made easy to clean, be-cause of bad gasoline, engines running to cold, absence of thermostats and engines not well maintained.
With spinning fan as center electrode.
With a ball in motion when engine is running.
Easy to detach for cleaning.