Originally Posted by Fred.Stucklen
I have since confirmed that all the new spark plug wires are around 110 ohms each, with no intermitance detected. The BREIX plugs came out all dark black like they were subjected to a VERY rich fuel flow. Even the exhaust pipes were black! And I always run LEAN of peak! It's like the plugs are not burning the fuel....
Today I pulled the BREIX plugs (gaped at 0.035") and replaced them with BRES-3961 plugs gaped at 0.045". I've also cleaned the injectors per the Lycoming SB. I will test fly it tomorrow to see if there has been any improvement to the leaning .....
After a long discussion with EMAG support, we've come to the conclusion that my running rich issue may be some sort of timing issue between the aviation plugs and auto plugs. Since the evidence seems to support a late firing, resulting in higher EGT's and lower CHT's, advancing the timing slightly may make a big difference. Since I have an EI Commander that has the ability to offset the timing curve with a a user inputted offset, advancing the timing (in 1.2* increments) is somewhat easy. I'll start at that value, and test fly to see what the results are.
If anyone has an EI Commander that they use with PMAGS, I'd like to know what your setting values are.
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