is there a special tool to gap champion x plugs?
I've never heard of any. I use an ordinary wire gap gauge.
What is the right gap measure?
Thanks - or 0,65 mm :-)
If you go by Ford specs,
converts to 0.313" or 0.7938mm
If you read the instructions wrapped around the X plug they recommend .025".
This one gets it done.
Champions web listings for model T's(auntique repoduction) for us metric countries go even a little closer on the gap.
The X at .6mm (0.236")
and the 25,s at .7mm
My experience is that .030 works better than .025, but my engines always have higher than stock compression. Ron Patterson explained it to me once, in his "engineer-speak" manner, that higher compression needs a wider gap. I thought I understood him at the time, but there's no way I can explain it now. (Maybe he will if he reads this.) Anyway, I'm now running a Haibe Giant Power head milled 1/8", and .035 works great.
Depends a bit on the engine and type of plug.
For my most stock, the '23 and '24, running new X's, gapped at .025" per pkg. instructions on the X's insert, the T's runs great.
For the '27, Prus head, running the cheaper Champion 25's gapped just at .030" tight, so likely about .029, runs super.
Ford Manual in '27 says gap old-style period X's at 1/32" or .031". The Service Bulletin says to gap those old time X's at about .030".
Yes, there is a tool and it looks like this.
My special tool is the back of a hack-saw blade.
But boy!, do specs vary!!
thank's, it just seemed a little difficult with my regular wheel gauge and I was afraid to break the bent piece if I moved it too many times!