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Hot Magnetos

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tamara_b(at)telus.net
Guest

Posted: Tue Jul 11, 2006 7:24 pm Post subject: Hot Magnetos

Gentlemen,



with my last annual a couple of weeks ago

I had to replace both of my magnetos on my CJ.



After a few test flights I measured the surface

temperature of the distributor cap covers, it showed

on average 150 degrees centigrade.



Now here comes my question: Is that kind of high

temperature normal, and if yes what could be the

cause of such unusual peaks?



Thank you in advance for your much appreciated help.



Cheers



Elmar (C-FTKL)

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cjpilot710(at)aol.com
Guest

Posted: Wed Jul 12, 2006 3:31 am Post subject: Hot Magnetos

Funny I've never  considered the temperature of the mags before.  I think that because of  conduction anything on the engine wound be heated likewise.  This however  sounds like a reasonable temperature to me.

  

 Some one wish to  elucidate further?

  

 Jim "Pappy"  Goolsby

  

  

  

  

  

  

 

Gentlemen,



with my last annual a couple of weeks ago

I had to  replace both of my magnetos on my CJ.



After a few test flights I measured  the surface

temperature of the distributor cap covers, it showed

on  average 150 degrees centigrade.



Now here comes my question: Is that kind  of high

temperature normal, and if yes what could be the

cause of such  unusual peaks?



Thank you in advance for your much appreciated  help.



Cheers



Elmar (C-FTKL)

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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dsavarese(at)elmore.rr.co
Guest

Posted: Wed Jul 12, 2006 3:43 am Post subject: Hot Magnetos

I am curious as to how you determined you had to replace both  magnetos?   What were the problems or symptoms you were experiencing  with your engine?

 Dennis

  

 [quote]   ---

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viperdoc(at)mindspring.co
Guest

Posted: Wed Jul 12, 2006 4:50 am Post subject: Hot Magnetos

Pappy/Elmar,

 I think conduction is a reasonable conclusion. Considering when I have measured my cylinder head temps on all 9 with a laser thermal probe, it has averaged 220  'ish for 9 thru 3 and 190 'ish for 4 thru 8. That heat is going to go somewhere both by conduction, convection, and radiation. Like Pappy, I feel that is probably a reasonable temp for the mags.

 Doc

  

 



  

 [quote] ---

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tamara_b(at)telus.net
Guest

Posted: Wed Jul 12, 2006 11:22 am Post subject: Hot Magnetos

The bearing under the rotor of my left magneto

had that much play, that the rotor actually came

in contact with the distributor cap and damaged it.

My right magneto had almost no pre-ignition angle,

the flyweights were seized up.

The engine has 400 hours since overhaul and

1000 hours since new, so I was wondering what

the cause for the premature magneto wear-outs

could have been.



Thank you again for your valuable input.



cheers



Elmar (C-FTKL)

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