Spark Plugs on P-Mags

[frankh]

Flying along and the intercom got dreadfully noisy aroung 100 hours....Replaced the plugs and all was well...I get them for 1.18 bucks around here.

Frank

[Radomir]

ECI will/can do 14mm for top plugs... beefs up that boss a bit as well... not sure if it applies to angle valve stuff..

[dan]

I read a while back that Lycoming will be (if they're not already) offering cylinder heads with 14mm spark plug holes. I googled for it and found this: http://phx.corporate-ir.net/phoenix....783&highlight=

I think ECI might offer a 14mm option as well. http://www.eci2fly.com/exp/FAQ.aspx

I go back and forth. At times I think the 14mm cyl heads would be great, simpler, stronger, etc. Other times I think the 18mm setup is most versatile and doesn't close any doors.

[frankh]

Does one need the 18mm hole for borescope inspections or is the probe small enough to get in through a 14mm hole?

Frank

[SFB711]

60 hrs on a set of .035 gapped champions and all look great with two p mags running 25 degree timing and a mix of auto and 100LL.

[molson309]

My apologies for resurrecting an old thread, but I think this is useful information for those running automotive plugs:

If your radio starts getting ignition noise, make sure you clean and put a light amount of dielectric grease on the plugs/inside boots. Thinking it was the plugs that were at fault, I was replacing them every 100 hours - since I used dielectric grease the problem has not recurred, even with several hundred hours on the (now iridium) plugs. At annual I clean and regrease them, even though the noise in the radios is still not present.

[frankh]

I did use the dielectric grease and it seems to work

Frank

[pat]

My ECI parallel IO360 has 14mm all the way around. Its an option with ECI.