MTFCA Forum

Today I was able to purchase this Chicago BiPlug. It is for a vehicle that chronically fouls the plugs. Solution is to just pull the plug and flip it over. For all you Spark Plug experts, how rare is this?

I don't have that one in my collection ! Nice find.

JUST FLIP IT, brand.

I would say it is unusual but not rare. There were several different brands that manufactured the same style plug. I've got a couple different types. It's a neat find, and a 'must-have' type for most any plug collector. I hope that helps.

I’m no spark plug aficionado, but my first thought was...

I agree Kevin, I'm not into Jackalopes but I had to have this one when I saw it. The orange cap has a brass contact the touches the electrode when in the correct position. Definitely evidence of having been used.

Here's one that I've got. Same (interesting, but mediocre) idea.

I have collected plugs for 50 years and this is the first one I have seen.
Thanks for showing it here.
Rich

Thanks for posting - I've collected plugs a long time and have several varieties of those double ended plugs in my collection. They are oddities for sure and are sought after by plug collectors. Here is an example of a very early one with a mica window in the removable cap. It's done that way so you can actually see the spark jump. Theoretically when the spark jumps an air gap, it actually intensifies the spark. Supposedly that would help burn off any deposits. Looks like it's in pretty nice condition with the original cap.
Terry