My 1924 cut-off pickup came to me without a magneto and with a Truefire installed. When I set the timing, I found that I could not bend the stock spark rod to a long enough length to reach the timer without the rod hitting or rubbing on something.
So, I mocked up a longer rod with a coat hanger, then fabricated a new rod to match the mockup with the closest mild steel rod size I could find at the local hardware store, 3/16 inch.
The 3/16 inch rod works great, but it always bothered me that it was a little small and had some slop at the two ends. I found some 7/32 inch music wire, but it was way too hard and stiff to bend easily in my vice. So, I kept hunting around on the internet for some 7/32 inch mild steel rod and finally found some at McMaster Carr, here it is:
Although it says tool steel, it is soft enough to take all the required bends without too much effort. Works great now, and no slop!
If you need to fabricate a custom spark or throttle rod in the proper 7/32 inch diameter, this rod works well.
You might get it locally, it's AKA drill rod.
You can also buy known as "silver steel". use as it comes or heat and quench to harden, then heat again to temper.
I guess I wondered what other Tru-Fire owners had to do for a timer rod since I would think the easiest thing to do would be to simply buy a new timer rod and hook it up. What usually happens is that people bend the "stock" rod in the wrong place while trying to dodge things that are not installed correctly like water hoses and clamps. I thought the Tru-Fire emulated a regular timer at the timer end so all you should then have to do is bend the timer rod IN THE UPPER ARC portion only by either squeezing the arc together to advance the timing or pulling it part to a larger arc width to retard the timing. I have always found the "stock" yimer rod fits nice with regular timer but was not aware that the tru fire had the timer rod connection located a mile away from "stock" position. Is it that far off when timed correctly.
John, it's pretty far over when timed correctly, here is a (bad quality) picture of another Truefire installation that I found elsewhere on the forum. My timer is in the same position as the one in the picture when my timing set at 15 degrees after TDC.
I may be missing something here, but my understanding is that you use any regular timer with the True Fire, and the use of True Fire should not affect the timing that much.
Is it possible this car also has the camshaft advanced?
well... I wish I could edit. Looks like True Fire does also change the timer. I always thought they were just electronic coils. I guess not. :o
Here's a couple of pictures of the stuff that goes inside the timer when you install a Truefire. The white plastic thing that replaces the roller has two magnets embedded in it, 180 degrees apart.
I wondered about the same thing , I cut my rod and added a turnbuckle so I could retard the timer enough. My rod just wasn't long enough with out touching a connection. Love the new unit otherwise.