shempdowling2(at)earthlin Guest
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Posted: Thu Apr 26, 2007 6:10 am Post subject: Lightspeed electronic ignition |
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I was reading the instructions in the timing manual and they mentioned the timing at idle should be at 40 btdc with manifold pressure input and 20 without. I used an automotive timing light, however I think mine has a potentiometer, which your not supposed to use. Anyway, I found my timing to be about 30btdc at idle using the gun but my lightspeed provided display showed the correct 40 degrees. Now Im wondering, do I even have to use the timing light since I purchased the optional display which shows me the timing?
I also thought it would fire closer to 25 btdc at idle and advance with rpm. I was surprised to see it firing so early.
I did a typical mag check at 1700 and got about 150 drop in my mag and almost no drop in the electronic. Its running very smoothly. However, at low power settings and just one mag, it backfired and ran a bit rough. Does that sound normal? I checked the mag timing and its right on. New plugs.
Shemp/Jeff Dowling
RV-6A, N915JD
300+ hours
Chicago
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