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Dle-20 Blew up....

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Old 11-11-2012, 11:30 AM
  #126
Speedy-Gonzales
 
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Default RE: Dle-20 Blew up....

I agree. Sometimes it is just a matter of which engine was delivered to your door and "Murphy's Law". [:@]
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Old 11-11-2012, 12:15 PM
  #127
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Default RE: Dle-20 Blew up....


Quote:
ORIGINAL: Speedy-Gonzales

I agree. Sometimes it is just a matter of which engine was delivered to your door and ''Murphy's Law''. [:@]
I've been at this hobby for quite awhile now and have bought more then a few engines over the years. I've bought quality and I've bought cheap along the way and the "sort of" rule you stated above pretty much applies to all of them! In fact, it pretty much applies to just about everything we buy. Spending more doesn't always guarantee a trouble free owner experience.
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Old 11-11-2012, 12:54 PM
  #128
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Default RE: Dle-20 Blew up....

I'll agree on that statement too!!!!

Happy Veteran's Day!
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Old 11-11-2012, 04:21 PM
  #129
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Default RE: Dle-20 Blew up....


Quote:
ORIGINAL: Truckracer


Quote:
ORIGINAL: Speedy-Gonzales

I agree. Sometimes it is just a matter of which engine was delivered to your door and ''Murphy's Law''. [:@]
I've been at this hobby for quite awhile now and have bought more then a few engines over the years. I've bought quality and I've bought cheap along the way and the ''sort of'' rule you stated above pretty much applies to all of them! In fact, it pretty much applies to just about everything we buy. Spending more doesn't always guarantee a trouble free owner experience.
So very true as I bought a Zenoah engine that ran quite well but had a ring gap of .037".

Karol
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Old 11-11-2012, 05:54 PM
  #130
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Default RE: Dle-20 Blew up....

Blackpowder..and everyone else too!

Just finished checking the timing on the DLE20 that threw it's pin. It was set right at 30 degrees. No problem there.

Weather was just great around here this w/e. I spent a lot of it just thrashing this Mojo/DLE20/Xoar17X6 combo to the limit. Plane weighs right at 10 lbs wet and it will pull it around like a rag doll! I can't prove it, but I wouldn't be surprised if I was exceeding 10K rpm at times.

No, I'm not going to back off of it one bit. It'll either hold up..... or not. Time will tell.
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Old 11-11-2012, 07:25 PM
  #131
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Default RE: Dle-20 Blew up....

You should be pretty safe with a 17x6. That and the 16x8 are likely the most popular props run on this engine?
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Old 11-11-2012, 07:47 PM
  #132
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Default RE: Dle-20 Blew up....

757jonp,
Thanks for the info. I set mine at 30 degrees. I will check the one that I've been flying tomorrow. It's on a GP Super Skybolt, 9.5 pounds spinning a 14 x 10 at 8500, but I'm at over 5000 ft.
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Old 11-11-2012, 08:55 PM
  #133
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Default RE: Dle-20 Blew up....

Please correct me if wrong but I believe that just because we "set" the timing at 30+ degrees does NOT mean that is where the CDI unit will be timing the engine when running and up to top speed. The 30+ or whatever is just a benchmark which will give the correct timing of 27 - 29 degrees when running. Of course the timing is retarded much below that figure when at lower rpms.

And a DLE ignition unit will require more advance when "setting" the timing than a RCEXEL unit on the same engine. But once running at top speed they both give the same result, 27 - 29 or so degrees.
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Old 11-11-2012, 09:50 PM
  #134
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Default RE: Dle-20 Blew up....

I design aerospace bearings for a living. It is a manufacturing flaw. The bearing failure / damage was scondary to pin fracture.

Speedy-Gonzales is 100% correct. QC in China is horrible. I suspect you are not the fist DLE owner this has happened to.
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Old 11-11-2012, 09:59 PM
  #135
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Default RE: Dle-20 Blew up....


Quote:
ORIGINAL: KoleDeRacer

The galling happened after it was blown up more then likely from the prop turning on the way down and getting scratched on the crank.
The ignition is model A-01
I've never seen galling like that on a single cylinder engine. Doubtful the prop could turn it over after the failure. Might make sense to do some checking to find out if something else (like a missing thrust washer or mis-installed bearing) could have caused the galling and led up to the failure. Thanks for posting the photos. Very interesting thread and I hope you get to the root cause.
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Old 11-12-2012, 07:26 AM
  #136
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Default RE: Dle-20 Blew up....

Hey Ernie

DLE ignition is a RCEXEL with a DLE sticker on it first of all. When doing static timing, you are sensing the advanced position. The unit will not retard until movement (RPM) is detected (I believe the minimum is about 200 RPM).

BTW, I just received a new ignition from Hobby King that I ordered out of curiosity. $23.99 and got shipped with other stuff, appears to be what we know as RCEXEL with a "Paragon" brand name on it. Not sure what model it is, but more than likely it's an 01. Hopefully it has a more "friendly" ignition curve. I'll let u'alls know what I find out shortly.
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Old 11-12-2012, 08:54 AM
  #137
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Default RE: Dle-20 Blew up....

I set the timing at 28 degrees because that is where Rcexl recomends and also I believe that C&H does the same. So on other engines that I have used the Rcexl ingition on that was my startng point. I think that it makes it easer to start and after when its running I have no idea if it advances to make power. Thats how my race car ignition works. ? To quote Speedy I'm not an expert, I just read the instructions.
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