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  1. DKGrimm

    IC Engine Scaling and Design

    I had missed this one for some reason. Thanks.
  2. DKGrimm

    Machining Valve Stems

    I've made 1/8" stem valves this way, and it does work. I found it to be kind of a pain to get the surface finish on the stem that I wanted, though. I use the drill-rod-silver-soldered-to-SS-head method that John Vietti and others have described. Either way works but the latter is less work...
  3. DKGrimm

    Tests of CDI Ignition Modules

    Really interesting video. Thanks. A lot of raw meat to digest; more questions than answers. I'm going to try to get back to this when I get some more time. Right now, I'm still trying to get my engine running. I don't think it likes me very much. There seems to be more going on there than...
  4. DKGrimm

    North Dakota

    For me it's 900 miles to Estevan and 700 miles to the Black Hills show, and I never miss either one. Did you ever run into John Zumpf before he passed away last year? He always went to both those shows, and it wouldn't surprise me if he also went to Huntley.
  5. DKGrimm

    North Dakota

    Amen!
  6. DKGrimm

    North Dakota

    When is it? I've always wanted to see it. Maybe I can bend some summer travel to fit. Don
  7. DKGrimm

    North Dakota

    Man, does that ever bring back memories. That place was my world until I left for college in 1955. Here is the same place taken about 1937, the year I was born.
  8. DKGrimm

    North Dakota

    Now that's interesting. In the later '50s an Allis Chalmers -- Corner Garage sign was stolen in the middle of the night from my dad's place. Years later I started seeing replicas of that exact sign in restaurants around Minnesota and Iowa. It may still be available through restaurant...
  9. DKGrimm

    North Dakota

    Does the town Hurdsfield mean anything to you? I grew up there working in the shop my dad's Allis Chalmers dealership. Moved to Iowa in 1959. It's always interesting to meet up with fellow North Dakotans. Don
  10. DKGrimm

    Tests of CDI Ignition Modules

    Interesting observations. A lot going on during the 1ms or so duration of a spark. I don't have what it takes to understand the chemistry going on in a plasma. I would like to hear whatever you learn from your tests.
  11. DKGrimm

    Tests of CDI Ignition Modules

    Excellent points. The only reason for the ballast resistor in these tests was to test the coils themselves at different levels of primary current. I will run more tests with smaller ballast resistors, and then with none at all, just to see how strong the spark gets for each case. Your point...
  12. DKGrimm

    Tests of CDI Ignition Modules

    Right. I remember you telling me this before, but everything works so well as is I just never bothered to look. I'll do so, but first we have a local machinist club meeting on April 1 (yes, really, no fooling). I want to hook up your driver with one of the coils and see if that can make my...
  13. DKGrimm

    Tests of CDI Ignition Modules

    It's taken looooong enough, but I finally got some results to put in front of people. The chart is a summary of results testing the 8 coils I have gotten my hands on. I got most of them from John Vietti. Their pedigree was lost in the transfer, but the pictures in the second attachment may...
  14. DKGrimm

    Tests of CDI Ignition Modules

    Sounds like that should be a good combination. Just ordered a 24-71532 for my tests. Looks the same, but if you want me to run one of yours, I'd be happy to. I'll send an address by private message.
  15. DKGrimm

    Tests of CDI Ignition Modules

    That's in my plan.
  16. DKGrimm

    Tests of CDI Ignition Modules

    You got me. 0.025.
  17. DKGrimm

    Tests of CDI Ignition Modules

    Coil resistance was 1.4 ohms, and I used 2 ohms ballast resistor with a 6 volt sealed cell lead-acid battery. I didn't measure the drop across the driver or the droop in the battery voltage. I measured the current with the 0.1 ohm sampling resistor. Just trying to get a feel for the minimum...
  18. DKGrimm

    Tests of CDI Ignition Modules

    I know I promised at the beginning of this that I would test various CDI and inductive ignition systems and report the results. It turned into a much bigger problem that I though it might be, but I though this would be a good time to do an interim report to show where things stand right now. At...
  19. DKGrimm

    Tests of CDI Ignition Modules

    I'll do that when I get a chance, Pete. I think you are 100% right about the threat to the Hall sensor. That spike is so energetic that it couples into everything, and you will definitely see it in the primary. Roy Sholl caught on to this many years ago and advised people to keep grounds...
  20. DKGrimm

    Tests of CDI Ignition Modules

    When I said that I was talking about test firing ignition modules into a resistor, as I recall. That load would be very different from a spark plug. I don't think there's any energy lost in the spark plug itself. Whatever current and voltage go into the terminal on top goes into the spark. I...
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