MTFCA Forum

Hi

I bought a set of Campion x spark plugs for my 1926 Touring from two sellers on Ebay and had them sent to me in Switzerland. I figured they were both the late old plugs.

But I see some differences:

-Cone at the base of the cable connection thread
-Length of the porcelain
-Mounting of the archwire

Can someone enlighten me there?

What should I do with the spark plugs? Clean the outside and put it into operation?
Or disassemble, clean and rebuild? Does that bring anything besides the risk of damaging something?

greetings from Switzerland

Beat ; Clean them on the outside and put them in your T for atleast the next 10 years .
All the best from Holland
Toon

Beat.... After cleaning and dressing the bottom electrodes with a wire wheel check for a gap of 0.025" and adjust. Next check for continuity between the center electrode and top connector. 100% meter reading passes test. Good choice for spark plugs. Enjoy !

If you take them apart they may not go back together. Can leak cause gasket goes bad. Gaskets not available.

Beat

as you have noticed, Champion X plugs have changed over the course of years. Both the heat range (length of porcelain) as well as the threads all changed to meet the needs of the engines they served. The earlier plugs have a shorter "reach" for low heads while the later plugs have a longer "reach" for tall heads. Often times, the center electrodes were replaced and didn't always match the base/screw portion of the plug for they year they were intended to be used. I suspect this is what you're seeing.

Fellow Forum member Steve Jelf has put together a really nice tutorial on them and it can be found here: https://dauntlessgeezer.com/DG95.html

When buying plugs off of eBay, be wary of "new" Champion X plugs that are faulty. For several years, Champion made them with faulty threads which leaked horribly. They were double-cut, with the crest of the thread having a "V" cut into it all the way around from end to end. They will never seal and will make an oily mess all over your car no matter how tight you dare to tighten them.

I would not touch those plugs with a wire brush of any kind.

Beat..... Your decision on how to proceed with those plugs is your ultimate best.

Gaskets not available.

I use aircraft gaskets. See the link Scott posted.

I would not touch those plugs with a wire brush of any kind.

I wire brush the base and collar inside and out, not the insulator, with no ill effects that I can detect. See the link Scott posted.

It won't hurt the base. I'd stay away from the electrodes with a wire brush. Wire brushing plugs that still have their original finish mostly intact is needless and will remove the surface finish. Very rusty plugs are a different matter. The plugs pictured above appear to be in very good condition with good factory finish and sharp electrodes. I'd soak them in solvent, then use a soft bristle brush on the electrode end, then gap and install them. It would be nice to locate enough plugs to make two matched sets in similar condition.

Thank you for all the feedback.

I think I will only clean the spark plugs on the outside and then put them into operation. If they run well, the spark plugs will probably stay as they are.
I have a set of four of each variety.


I don't see an answer to my question about the difference. I am particularly concerned about the different heat ranges (length of the porcelain). I wasn't aware that there were differences in brass hat plugs. Have there been any changes made over the years? Under certain conditions, some work better than others?

greetings from Switzerland