MTFCA Forum

I just submitted a thread yeasterday to get your opinions on my spark plugs and the consensus is that they look fine, so, my gaps are probably set properly, but I’m going to ask this anyway. Regarding the Champion X spark plugs… I know the instructions that came with the plugs recommends a gap of .025, and that is what I have always used, but there are always exceptions to the rule and many of you do a lot of work trying different things to get the most out of your Model T engines. In your experiences, have you discovered a gap that works more optimally than .025? Jim Patrick

Try this Google search for previous responses to your question https://www.google.com/search?q=gap+Cha ... nt=gws-wiz it may have some additional insight to what other response you may get. You can get text, pictures and even videos
May need to know what mods your engine has & carb

Jim I like to make a suggestion.. I would send those plugs back to the supplier. Looking at the threads... The threads do not show a point, rather than a flatness. The deepness or the sharpness of those threads are not quality and my estimation since they will not seal into the threads of the cylinder head. The flat threads promote compression leakage.

Plug gap at 0.025" works optimum as long as your ignition coils are calibrated correctly.

Jim,

this was my experience a couple of years ago starting off with 0.025 gap on new Champion X plugs:

viewtopic.php?f=2&t=14104&p=106559#p106462

Moxie26 wrote: ↑

Thu Feb 24, 2022 12:30 pm

Jim I like to make a suggestion.. I would send those plugs back to the supplier. Looking at the threads... The threads do not show a point, rather than a flatness. The deepness or the sharpness of those threads are not quality and my estimation since they will not seal into the threads of the cylinder head. The flat threads promote compression leakage.

Gosh! How can you even see that?

Moxie26 wrote: ↑

Thu Feb 24, 2022 12:30 pm

Jim I like to make a suggestion.. I would send those plugs back to the supplier. Looking at the threads... The threads do not show a point, rather than a flatness. The deepness or the sharpness of those threads are not quality and my estimation since they will not seal into the threads of the cylinder head. The flat threads promote compression leakage.

I assume that those are used plugs. dirt around the porcelain. The 4 plugs are an enlarged photo so some detail on threads gets lost. May be sharper then they appear

Thank you all for your responses. Those are brand new, never used plugs I bought from Snyder’s 10 years ago and recently sold on eBay. The buyer was very happy with them. Jim Patrick