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Old 02-20-2021, 12:35 PM
Jvon811's Avatar
Jvon811 Jvon811 is offline
Join Date: Mar 2014
Location: GA80 Whispering Pines Airpark
Posts: 241

Originally Posted by lr172 View Post
So, on a simpler level, why are you using a plug that degrades in 25 hours.
As mentioned in the original post, I have dual P-Mags. Page 8-9 of the Emag Install manual. See attached image. They do admit they haven’t personally tested them, but it’s one of the few recommendations in the manual. Thanks for your opinions though.

Originally Posted by lr172 View Post
Also, regardless of what professor Busch says, I do most of my cruise at 30* LOP.
That’s fine, to each their own engine. I just know what I like and think works with my Carbureted engine... I don’t think 30* LOP is completely wrong but I think 60-90* is better if you’re not running high MAP (which I don’t when LOP).

But that’s not even what this thread was about. I’m just asking about this different plug, ya know, experimental aircraft? I’m not completely re-inventing the wheel, just wondering if there’s maybe a slightly better shape.
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RV-4 N249P
O-320, Dual P-Mags, Warnke Prop, Short legs, Manual Flaps, GRT Sport EX

Last edited by Jvon811 : 02-20-2021 at 12:42 PM. Reason: Syntax
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Old 02-20-2021, 01:03 PM
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emsvitil emsvitil is offline
Join Date: Oct 2019
Location: SoCal
Posts: 661

As anybody ever used the Mazda rotary engine plugs?


More like a plane plug.

Althoug the gap might be a problem
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Old 02-20-2021, 03:17 PM
sailvi767 sailvi767 is offline
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,466

Originally Posted by Jvon811 View Post
Right, that’s my point. I can do 30* but not the usual 60-90* I can get with new/clean plugs. Im also a Mike Busch subscriber of LOP Ops and I don’t really hang out in the 30* LOP area too much.

I’m not necessarily looking for everyone’s plug advice, I know what I like and what works just fine. And I’m not saying they wear out, I’m not saying they run bad, at all. But I CAN tell a difference between fresh clean plugs and 25-50 hour plugs when going real deep LOP. I could clean them (maybe even media blast them as long as they’re cleaned really well) or just buy a ~$20 set of new plugs for the bottoms and be on my way...

My question is simply if anyone knows anything about these Ruthenium plugs. What’s makes the special. Could it help keep LOP ops running cleaner longer? I’m talking like 98th percentile stuff, that’s all...
Something I have noted in both aircraft I have owned about running LOP. They each would run much better LOP at lower altitudes. Current aircraft is butter smooth as lean as I want to run it below 7500. Above that I start to lose LOP capability. Prior aircraft was about the same. Current aircraft is a IO540 and does need better injector balance. (.5 GPH)
RV-6 sold
F-1 Rocket
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Old 01-07-2022, 01:18 PM
mfshook62 mfshook62 is offline
Join Date: Sep 2008
Location: Windsor, Ca
Posts: 133
Default Carburated or Fuel Injected

Are you all discussing fuel injected engines? I think it would be helpful to mention the type of carburation used on your engine when comparing spark plugs, LOP, and EGT's.
Mike Shook, RV-9A, Dynon HDX,
CPI-2 Ignition, Catto Prop, EAA 124

Last edited by mfshook62 : 01-07-2022 at 01:23 PM.
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