Originally Posted by F1Boss
Could be wires - I know it is on mine - but it's not bad enough to spend an AMU on new wires & plugs. I'll change to auto plugs when this set wears out, and change to plug adapters and auto wires at the same time.
Made up as many as I could on the new build today (ran out of wire - ordered more), so now I know how to make the best wires available (MSD 8.5mm) - why buy the overpriced aviation stuff?
How do I know it's wires on my bird? The crackle follows the engine RPM...
Might check your plug/wire connection for tightness, and inside the plug top end for contamination too.
Bingo!!! Thank you!!
I have one EI and was running the Autolite 386 plugs (only 18mm plug with a resistor). While I had no problems, I felt that the plugs were too hot (ceramic cones were running a bit too white for my comfort) and decided to try the NGK AB-8's. Those are non-resistor plugs, so I bought new connectors that had the 5K resistor in them. I made this change before my last flight and forgot that when trying to find reasons for the noise.
It is possible that I didn't get the connectors on properly (They have a screw in design instead of crimps) or they simply aren't a reasonable alternative to resistor plugs for eliminating noise. However, all plugs are firing and still able to run 100 LOP without issue, so probably not a botched installation.
I feel so foolish for not remembering that I made that change when trying to figure this out.
Thanks again and I'll post the final results on this plug configuration, as it represents a good option to avoid those 18 - 14mm bushings.