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Old 10-28-2020, 11:20 AM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
Join Date: Jan 2005
Location: NC25
Posts: 3,554

Originally Posted by iamtheari View Post
Does the polarity work out so my cylinder 1 and 3 bottom plugs and cylinder 2 and 4 top plugs will be opposite, and rotating them will give that benefit even though the automotive plugs and E-mag donít get it? That would justify the split.
Lycoming firing order is 1-3-2-4 for four cylinder engines. Every other time the mag fires would be same polarity. Plug 1 and 2 have polarity opposite of plug 3 and 4.

With one EI (E-mag), you could have all EI plugs on the bottom and all mag plugs on the top if you want to do that.

When it comes time to rotate the plugs, rotate them to next in firing order. For what the automotive plugs cost, you may just want to install new ones.
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Old 10-28-2020, 11:52 AM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,480

Originally Posted by BlndRvtr View Post
When joining the electronic ignition bandwagon, what do you all think of running all the bottom plugs off the electronic "non-mag" and all the top plugs off the tractor mag?

My thought is that the bottom plugs have been the ones more prone to fouling (Lyc IO-360) and therefore the fouling might be mitigated by the more vigorous spark produced by the electronic mag. Also, how does "wasted spark" factor into plug condition?

Its all about the heat range of the plug, not the spark energy. I put the 37by's on the bottom and auto plugs on top. The 37by has a much larger cavity between the ceramic and shell (designed that way to reduce fouling), making it more resistant to lead ball collection than the auto plugs. They collect plenty of lead balls, but they are far away from shorting the center electrode to the shell (i.e. fouled)

wasted spark has no relevance to this. Lead collection has little to do with the spark plug heat range and more about combustion gas termperature.
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Last edited by lr172 : 10-28-2020 at 11:55 AM.
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