TDegenhart
Diamond
- Joined
- Mar 26, 2011
- Location
- Geneva Illinois USA
For you history buffs, why are spark plugs metric, when until recently, the rest of the engine was english?
Tom
Tom
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Why does the rest of the world use British pipe thread instead of US pipe thread?
I believe the modern spark plug was invented in France. Before that they had hot plugs. Same reason that ball bearings are metric.
Bill D.
History of Spark Plugs - A.S.E.C.C.
My Gravely tractor uses the old style larger plugs. It was designed in 1918, but it is a metric plug. I think Ford used a tapered pipe thread with no sealing washer. Why does the rest of the world use British pipe thread instead of US pipe thread? Several months ago I asked here and found out the entire world uses 1/4, 3/8 or 1/2 " square drive for sockets.
Bill D.
I think it has something to do with how many meters a spark plug will fly when it is blown out of a Ford Triton V8 engine head.
OK spark plugs......
What about tire rim diameter?
Is that always in inches?
And while we are talking about spark plugs, Ford introduced 18 mm(I think) in the late 50's.Do they still use the tapered seat and the larger dia. thread? Haven't owned a Ford in a long time.
JH
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