A friend of mine left his 17 out overnight in the rain. When I went to his house to help him start it I found the coil box shorting to the firewall.
I convinced him to let me rebuild the coil box with Regan's rebuild kit and to change out the Champion 29 spark plugs with Champion x's.
This car has always been hard to start cold, but now starts on the second pull when cold. I figure it was the Champion 29's making it hard to start before the coil box got wet.
My question is what car were the Champion 29's made for.
Thanks
Steven
29s? I'm not familiar with Champion 29s. The Champion A-25 is a standard pipe thread plug that will fit a T. They have been made continuously since about the 1940s. They began as a renumbered Champion X (I would guess that it fit into their catalog numbering system better) and later changed into a more modern plug in I think the late '60s. In addition to model Ts and a few dozen other early automobiles, pipe thread plugs were used in many industrial and marine engines manufactured well into the '30s. Many of those engines are still in use today for their intended purpose.
The A-25 has a modern, broader, gap than the earlier plugs or new Champion Xs. I suspect the spark on the A-25s is not as hot (I could be wrong about that) and certainly they do not work as well with under-vaporized fuel at low rpm. The antique style plugs do make it easier to start a T engine, especially when it is cold.
Good for you, helping a friend! (And helping to convert him.)
Drive carefully, and enjoy, W2
Thanks Wayne, these Champion 29s are a standard pipe thread but do not stick as far into the head as the x's. I have 4 now to add to my plug collection but I just wanted to know what used them as my research on the web is not getting anywhere.