With our excellent weather outside I have been hibernating in the basement where the temps are at least bearable. One of the projects I've been working on is a home built HCCT but I have questions. I'm using Gary Tillstrom's plans that call for a brake drum for the spark ring I have a piece of bronze that I would like to use instead but is somewhat smaller in diameter will it still work properly? Also I'm a little confused as to which side of the back plate the flange bearing goes on (see attached photo)I'm now thinking I have it wrong. Any help out there. Thanks Jim
As long as you can set the gap between the pointer and ring size should not matter.
Other side. You will have to find shorter bolts or grind to fit (or notch the plate). As to the ring, the smaller ring will work fine.
Thanks Gary I thought they looked a little close. Jim
Also forgot to ask which mag coil would be best, I have several including a double stack. I would probably get whichever one is best rebuilt. Jim
Of course size matters!
Just ask a guy with a big ----
He'll tell you that the bigger the better.
As far as which coil, the cheaper of course. Check with one of the engine builders near you as they may have a decent used one. I would never reuse one in an engine rebuild but in a coil tester, sure.
Back when I was doing reproductions of HCCT's I cast up several of the model T brake drums in aluminum which were used on the Allen testers, however, because there weren't enough call for that style tester I still have some in boxes here. These and the crank arms with the pointer that were used with this drum also cast in aluminum. The reason I made the brake drums in aluminum is that I couldn't find ones with a true diameter on the original used brake drums that I was looking at. I used an NOS original for my pattern and then turn them on the lathe so they are exact circles. I also have cast up several of the service products spark rings in aluminum with 16 sector markings although originally they were in iron and I had cast them in brass but I cast some in aluminum since they are cheaper to produce for guys doing DIY testers. Bob
Bob thanks for the info but I'm trying to do this as lo buck as possible just to see if I can. If I need some of your parts I would certainly get in touch. Especially since I know you make a high quality part as I've seen at your spot at Hershey. I got one of your Air Ford bi-planes, get lots of compliments. Thanks Jim