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  #11  
Old 11-30-2017, 03:23 PM
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snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
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You may have more than one problem here. If it were me, I'd track down that burning electrical smell first because that should be the easiest. Just offhand, the only things I can think of which would cause that would be 1. Alternator; 2; Starter; 3 Magneto Coils; 4: Oil pan heater (didn't you say you had one?). 5 Master or Starter relays; 6 Boost pump; 7 Wiring.

The only one of those items which would be related to the rough running would be the magneto coils, right? You can check those pretty easily.
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  #12  
Old 11-30-2017, 08:12 PM
nedricher nedricher is offline
 
Join Date: Jan 2013
Location: Peoria, AZ
Posts: 76
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Toward the end of your post you say you got no drop in rpm with a mag check, then later on a normal check? I would disconect the p leads and run it. That would eliminate the switch and associated wiring. You wont be able to check the mags individually, but it might just solve the problem. Just be carefull because the mags will be hot all the while the p leads are off.
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  #13  
Old 11-30-2017, 09:17 PM
6 Gun 6 Gun is offline
 
Join Date: Jun 2005
Posts: 827
Cool Engine

I would think oil at over 220 would be a problem and is the bad smell at 240 also high prob of vapor lock if your oil is that high just think how hot the engine is and fuel pump are the fuel has got to be boiling,I think you need to get your oil temps under control as soon as possible that kind of temp this time of year I don't see how you made it thur the summer.
Bob
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  #14  
Old 11-30-2017, 10:03 PM
F1R F1R is offline
 
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I missed the 240 oil temps!! Something is not right. Either you have massive friction - something very tight. Or the timing is way off.

Or no air or no oil is passing through the oil cooler.
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  #15  
Old 11-30-2017, 10:39 PM
Ben Meyer Ben Meyer is offline
 
Join Date: Dec 2013
Location: Peachtree City, GA
Posts: 48
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Does this sound like morning sickness/ stuck exhaust valve?
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  #16  
Old 12-01-2017, 06:02 AM
Jeff Hagg Jeff Hagg is offline
 
Join Date: Mar 2011
Location: Indpls. IN
Posts: 35
Default Sticking Intake valve guides

Had a similar problem, my intake guides start to shrink because the press fit of the guide to the head was excessive. This tolerance changes as the cylinders expands and contracts on low time rebuilds. Listen for air to exhaust thru the carburetor with the mags off.
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  #17  
Old 12-01-2017, 07:34 AM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
Posts: 594
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Quote:
Originally Posted by Ben Meyer View Post
Does this sound like morning sickness/ stuck exhaust valve?
The more I read about it, the more I think it does.

We're going to throw some 100LL into one of the wings and run that through it, see if it may help smooth it out..
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  #18  
Old 12-02-2017, 06:39 PM
ian greenland ian greenland is offline
 
Join Date: Jul 2013
Location: goondiwindi qld australia
Posts: 2
Default Rough Running

Could be shorting out under the distributor cap on the magsneto,would cause a burning smell and shorting and tracking at higher rpms, I would not fly it and possibly turn of the only good mag you have, I recently saw this on a continental engine, same problem,you could see the burning in the high voltage cover, just a thought !
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  #19  
Old 12-03-2017, 06:21 AM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
Posts: 594
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Quote:
Originally Posted by ian greenland View Post
I would not fly it..
Yeh, she's not going anywhere until all this is sorted out.

It's sitting over an hour from me at the moment, so I haven't really been able to do anything with it.

Fortunately, it broke at my mechanics home base, so he's going to be looking at it today.
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  #20  
Old 12-03-2017, 06:23 AM
Tram Tram is offline
 
Join Date: Sep 2007
Location: Florence, AL
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Quote:
Originally Posted by 6 Gun View Post
I would think oil at over 220 would be a problem and is the bad smell at 240 also high prob of vapor lock if your oil is that high just think how hot the engine is and fuel pump are the fuel has got to be boiling,I think you need to get your oil temps under control as soon as possible that kind of temp this time of year I don't see how you made it thur the summer.
Bob
Very good points. We didn't have a single issue during the summer and the temp spike was very brief. It hasn't occurred since during any run up since the issue.
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