Captain Avgas
Well Known Member
I have a Lightspeed EI firing my 4 upper auto plugs on my IO 360. I do not rotate them because I am not aware that there is any benefit in doing so.
However I have a Slick 4371 Magneto firing my 4 lower massive electrode aviation plugs and it is my understanding that rotating those bottom plugs will provide extended plug life. The goal is to rotate the plugs to reverse the polarity and hence even out the electrode wear.
The question is what is the correct sequence of plug rotation if only the bottom plugs are being rotated. My cylinder firing order is 1, 3, 2, 4.
I’ve had a really good look through the archives on this one but cannot find an answer. I am imagining that this might be of interest to a lot of other RV builders because many have EI on the top plugs and a magneto for the bottom plugs.
However I have a Slick 4371 Magneto firing my 4 lower massive electrode aviation plugs and it is my understanding that rotating those bottom plugs will provide extended plug life. The goal is to rotate the plugs to reverse the polarity and hence even out the electrode wear.
The question is what is the correct sequence of plug rotation if only the bottom plugs are being rotated. My cylinder firing order is 1, 3, 2, 4.
I’ve had a really good look through the archives on this one but cannot find an answer. I am imagining that this might be of interest to a lot of other RV builders because many have EI on the top plugs and a magneto for the bottom plugs.