I started out by modifying my electrical drawings, which was kind of fun. I had to add in the four coils, decide where the connections were and assign wire numbers.
Then I had to modify the switch connections on the instrument panel to get rid of the magneto P-Lead ground path and add the +12 volt power supply to the coils. Glad I managed to remember
Well, it turns out the hard part was finding a spot for four additional coils. I was hoping to attach them to my plenum in some fashion, but my friend John Cotter talked me out of it - and he was right.
Finally, I decided the only space available was the compartment that the magnetos previously occupied, the cutout in the firewall. John came over and helped me install these rascals. I think this installation will work, and I can actually reach in and get my hands on the coils, with the engine installed, for what ever reason may come up in the future.
It was a bit of a bother finding which spark plug wires to use, but I settled on the MSD Street Fire line. In retrospect I wish I used Magnecor, since they seem to be higher quality, but since I have $60+ invested, I'll keep them until I decide they're a problem.
Now that it's all done, I have been able to start the engine several times and it runs a lot smoother, especially noticeable in the lower RPM ranges. I think I'm going to like this setup. It's kind of odd pulling the prop through and not hearing the magneto impulse couplings clacking away.
So for now, I am waiting to test fly until I get a letter back from the FAA giving me my flight test area limitation. After five hours in the local area, I'll be good to go.
Hi Sam discovered your blog last week and have read it all now, well done. I have a C 85 powered Tailwind with an electronic ignition that I made up from the Megajolt system. I have another take on the trigger wheel you might be interested in. My email is jimscoles66atgmaildotcom send me a note and I will send you some pictures. Also would love to talk timing curves.
ReplyDeleteThanks Jim