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MagnaFlite MZ-6222 starter

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hotwheels

Joined: 01 Jun 2007
Posts: 240

Posted: Tue Jan 22, 2008 5:40 pm Post subject: MagnaFlite MZ-6222 starter

A MZ-6222 lightweight MagnaFlite starter came with my rebuilt O-540 engine. Does anyone know of a source to estimate real world current draw at starter engagement so as to properly size the wire? I'm pretty sure #2 would be safe, but can it be quantified a bit better than "hundreds of amps"?



The unit looks like it's in pretty good shape (teeth are not worn at least). Is there any way to test the state of internal electrical stuff besides disassembly?



Thanks in advance for replies.



Regards,

Jay

RV-10 Builder

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Last edited by hotwheels on Thu Jan 24, 2008 7:25 am; edited 1 time in total

hotwheels

Joined: 01 Jun 2007
Posts: 240

Posted: Thu Jan 24, 2008 7:24 am Post subject: Re: MagnaFlite MZ-6222 starter

#2 wire it is...



Response received from Kelly Aerospace:



The only information we have is for testing the starters in a "no load" condition on our test bench which does not correlate to the current draw under load with the starter turning the engine. I recall from past experiences that the current draw during cranking would be 250 - 350 amps under normal conditions, obviously higher at the initial onset of the start, then tapering off as the engine rotates.



I think the best idea would be to review a service manual for a production aircraft and use its electrical system schematic as a guide. Any Piper PA-235 Commanche or PA-23-250 Aztec series might be good examples to consider. Each of them run a Lycoming 540 engine.

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Jan 26, 2008 1:53 pm Post subject: MagnaFlite MZ-6222 starter

At 05:40 PM 1/22/2008 -0800, you wrote:



 	  Quote: 	
		  



A (yellow tagged) MZ-6222 lightweight MagnaFlite starter came with my 

rebuilt O-540 engine. Does anyone know of a source to estimate real world 

current draw at starter engagement so as to properly size the wire? I'm 

pretty sure #2 would be safe, but can it be quantified a bit better than 

"hundreds of amps"?



The unit looks like it's in pretty good shape (teeth are not worn at 

least). Is there any way to test the state of internal electrical stuff 

besides disassembly?



Thanks in advance for replies.


	


  If your battery and engine are on the same

  end of the airplane, #4 would probably be

  fine for all of your "fat" wires . . . #2

  would certainly be okay.



  Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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