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Electronic Ignition - Is it worth it

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Electronic Ignition - Is it worth it

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Old 28th Jun 2018, 08:36
  #21 (permalink)  
 
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Originally Posted by Aussie Bob
While your at it Rod, can you give me an example of a signed out over TBO engine failing and the bloke who signed it out being taken to the cleaners? Why is everyone happy to sign out engines that have calendar expired but no one wants to touch engines that have TX.
Aussie Bob,
You beat me to it with that question.
But it is all about perception, you understand. According to far too may in aviation, a perception of a "safety" problem is the same thing as a "fact/true fact/genuine fact" , So, if Rod the Con says the goals are full of LAMEs who signed an engine out on condition, and the aircraft subsequently crashed, it must be true, as a LAME, he wouldn't say it otherwise, would he??
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Old 28th Jun 2018, 09:17
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Originally Posted by Aussie Bob
While your at it Rod, can you give me an example of a signed out over TBO engine failing and the bloke who signed it out being taken to the cleaners? Why is everyone happy to sign out engines that have calendar expired but no one wants to touch engines that have TX?

Why do you need to know the engine to sign it out over TBO? Can't a bloke of your expertise simply tell a good engine from an detailed inspection and the logbooks?
I personally have more problems with calendar time and low hours, long sitting I hate and allows corrosion in bad places. Had a failure due to cam/lifters being corroded not long back - no you can not inspect that easy.

Rod may be able to at the moment tell an engine and what will happen over the next 12 months, me I reduce the risk but knowing the operator/owner/other engineers. I add that to test results and what can be seen and what may be in the logbooks. If I am then happy I will release on condition, that's just my rules - others have a different approach.
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Old 28th Jun 2018, 19:24
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Had a failure due to cam/lifters being corroded not long back - no you can not inspect that easy.
Maybe the corrosion was caused due to lack of use but there other causes. Recently I had an IO520 with just one lifter worn way down. This was discovered at 1,400 hours. The aircraft is always flown at least fortnightly and 250 hours per year. The engine was factory remanufactured with a new cam at that time.I do not believe corrosion had anything to do with it because all the other cams were fine and because of it's frequent operation. I do believe it was a manufacturing fault. We didn't report it to Continental because previous experience has told me it just gives them something to laugh about.
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Old 29th Jun 2018, 02:14
  #24 (permalink)  
 
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Rutan, I just saw a similar thing last week. An IO520 not started for 8 weeks, when started had a stuck exhaust valve. The problem was a corroded lifter. The corrosion started at an area of high wear. About 1200 TT from factory reman just 5 years ago.
On the other hand, I have recently seen an IO360, not run for 8 years and budgeted for a bulk strip prove to be absolutely corrosion free inside. Same environment too.

What this has to do with electronic ignition, I am unsure, both engines had conventional mags Must say, I am a fan of Camguard, although neither of these engines had it in them.
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Old 29th Jun 2018, 07:56
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It's a pity that Ian McRitchie isn't still with us for these failures sound to me like faulty heat treatment.
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Old 29th Jun 2018, 08:06
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Originally Posted by Sunfish
It's a pity that Ian McRitchie isn't still with us for these failures sound to me like faulty heat treatment.
Folks,
As I recall, that was a problem with some Lycoming VAR cranks a while back.
Is it my perception, or are there more engine failures from material defects these day?? particularly cams/cam followers, balance weights and actual crankcase problems.??
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Old 29th Jun 2018, 10:28
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Originally Posted by LeadSled
Folks,
As I recall, that was a problem with some Lycoming VAR cranks a while back.
Is it my perception, or are there more engine failures from material defects these day?? particularly cams/cam followers, balance weights and actual crankcase problems.??
Tootle pip!!
A change from impulse couplings flying apart.

This was a O-320 from memory, within TBO and Calender time but sat for several years. Lasted less than 200 hrs after that. No sign of metal in filters that were inspected regularly and about 10 hrs before failure.
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Old 30th Jun 2018, 08:08
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Originally Posted by Connedrod
.
.When a magneto discharges it makes multiple sparks each ingintion cycle on that lead.
This bit is definitely not true unless you have a special jigger in the system to make it happen
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Old 30th Jun 2018, 23:11
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Originally Posted by Andy_RR
This bit is definitely not true unless you have a special jigger in the system to make it happen
Like a "shower of sparks" but that is not each ignition cycle.
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