Jump to content

Spark plugs


Recommended Posts

To the best of my knowledge all U.S. cars have used either 14mm or 18mm sparkplugs since at least the 1920's, as do European makes. How did the various countries agree on metric sparkplugs when they did not agree on anything else? Does anyone know the background/history of this decision?

Link to comment
Share on other sites

They never did agree if you ask me. That's because there were more threads styles than you mentioned since 1920. Like pipe threaded ones in various reach lengths, as well as those very tiny threads on minature plugs that I "think" were on some sort of Ford engine in the 30's. I believe I have some NOS ones here someplace.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...