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  #1  
Old 10-15-2018, 10:46 AM
Aviaman Aviaman is offline
 
Join Date: Feb 2018
Location: Louisville KY
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Default ECi cylinder ADs

I am looking at an aircraft that has ECi “group A” cylinders. The AD require a compression test each 50 hrs. The Group “B” cylinder AD requires replacement.
My question is what defines “group A” and “group B” cylinders. Yes, I already know a set of serial numbers determine them, but I am not talking about that. I am asking what data caused these groups to be defined in the first place.
What was the failure data for group A? I see certain number of head separations quoted, something like 30 or so. But I never see how this is divided between the 2 groups. Anyone know any primary references ?

Thanks,
John
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  #2  
Old 10-15-2018, 06:15 PM
Ron B. Ron B. is offline
 
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Location: Yarmouth, Nova Scotia
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As I was told by ECI group "B" is where the problem is and they admit to having a problem. Group "A" is only a buffer. ECI explained it was just the FAA over reacting to the problem with group "B" . With that said, the person on the phone @ ECI a while later wasn't surprised to hear we had a group "A" cylinder fail at 90 ft above the water on take off. Basically said they would sell us another cylinder, yea right.
Good luck if you make the purchase.
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  #3  
Old 10-16-2018, 12:24 PM
Canadian_JOY Canadian_JOY is offline
 
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Location: Ontario, Canada
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You're only talking $5-6K for four new power assemblies (depends on the engine). Negotiate a price that leaves you the cash to replace them, then actually replace them so you have the peace of mind.
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  #4  
Old 10-16-2018, 05:10 PM
Aviaman Aviaman is offline
 
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Location: Louisville KY
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That’s basically my plan, to reserve $6000 for a new set of heads, and hopefully negotiating part of it into the purchase price.

Does anyone have a recommendation for the most reliable heads? Lycoming, Superior, etc.?
I know there are option like steel, chrome, nitride, along with rings that mate with them. Any recommendations there ? (Hoping not too much topic drift.)

John
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  #5  
Old 10-16-2018, 05:47 PM
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Ironflight Ironflight is offline
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Location: Dayton, NV
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Quote:
Originally Posted by Aviaman View Post
That’s basically my plan, to reserve $6000 for a new set of heads, and hopefully negotiating part of it into the purchase price.

Does anyone have a recommendation for the most reliable heads? Lycoming, Superior, etc.?
I know there are option like steel, chrome, nitride, along with rings that mate with them. Any recommendations there ? (Hoping not too much topic drift.)

John
I think you mean “Jugs” (Cylinders) - you don’t replace just the head, like on a car engine. I have had good luck with simple nitride Lycomning cylinders. The break in nicely, and if you fly regularly, corrosion isn’t an issue.

Also running an all-Superior engine on our bush plane, and have had no trouble with jugs in 200 hours - but that’s not a lot of time to form an opinion.
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  #6  
Old 10-18-2018, 12:42 PM
James Ball James Ball is offline
 
Join Date: Apr 2010
Location: San Antonio, TX
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Default Replacement Cylinders

The NiC3 electro plated cylinders by Continental Motors are an excellent option. They have a 5 year warranty on the barrel against wear and corrosion. Break in quickly too.
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  #7  
Old 10-18-2018, 12:56 PM
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Mark Albery Mark Albery is offline
 
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Location: Fremont CA
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I have over 800 hours on the 'A' cylinders with no problems.
I had heard that there weren't any reported failures with that batch, though Ron's experience indicates otherwise.

I believe the issue was with stresses due to the tolerance of the head to cylinder fit. I never see CHTs above 400 as I always hit oil T warnings before.
I don't know if high CHTs are a factor in early failure, but there are differential expansion issues between cylinder liner and head.
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