Need education on Old Sparkplugs

[jim1932]

I bought some old A parts and motors and need an education on the champion plugs:

I bought repo's for my "B" how can you tell the old plugs from repo?

What parts are salvageable? several pugs are broken, are the bottoms worth saving?

How do you restore them?

 

[modela@aol.com]

http://modelabasics.com/3xplug.htm

Please try this link for a quick and good 3x plug education.

 

[jim1932]

Ok... So if I read this right, rounded threes mean original. Wide wrench surface is early?

 

[jim1932]

Anyone know if rust dissolve hurts the porcelain? Should I take them apart first?

 

[Tom Wesenberg]

Anyone know if rust dissolve hurts the porcelain? Should I take them apart first?

I used molasses and it doesn't hurt the numbers or porcelain.

 

[Mike V. Florida]

Ok... So if I read this right, rounded threes mean original. Wide wrench surface is early?

Not 100% true. In the '70's for a MAFCA meet, Champion made plugs for the meet with the rounded 3 but "modern" metal base.

 

[Fred]

Not 100% true. In the '70's for a MAFCA meet, Champion made plugs for the meet with the rounded 3 but "modern" metal base.

Yes, they did.. But they have smaller #s & letters, plus the brass top hat is of two pieces, as is todays made 3xs.. The original ones are solid on top..

 

[30cabriolet]

Check this site out: http://rstreet.us/sparkplugs/3x/3X_Spark_Plugs_2_files/frame.htm

 

[jim1932]

Lots on the 3's. What were C-4 used for? what about the 0 Com and 1 Com?

 

[ursus]

The C-4 plugs were made for Model B but can be used in the "A" as well. 0-Com and 1-Com plugs were probably intended for some industrial applications and are too cold for Model A or B use. The equivalent to the C-4 would be the 2-Com plug.