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Starter Woes : follow up

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peter(at)mather.com
Guest

Posted: Thu Feb 07, 2008 10:21 am Post subject: Starter Woes : follow up

All



Thanks for the suggestions on my initial posting. Outcome as follows:



Used voltmeter to check voltages during cranking - basically no significant 

losses between battery and starter BUT voltage collapsed to 7.5 to 8.5 volts 

across the battery during cranking. According to Sky-tech's diagnostic chart 

this can only be a battery issue.



So used a large car battery to temporarily replace the PC680 and got 

acceptable cranking.

So replaced the PC680 - minor improvement over the old battery but not 

acceptable



Replaced the Magnaflite with a Sky-tech 149NL which is field wound and not 

permanent magnet, great cranking with both old and new battery.



So moral of the story: the PC680 is very marginal with the Magnaflite 

starter. The Sky-tech NL is a beautiful bit of kit



Best regards



Peter





____________________________________________________________________________



I've got a Magnaflite MZ6222 starter on my IO-320, Odyessy PC680 battery, #2

welding cable from battery to master contactor and to firewall earth (15"

and 12" respectively), 14" copper braid from firewall earth to sump bolt at

rear of engine, 6" copper bus bar from master contactor to starter

contactor, 24" #4 Tefzel from starter contactor to starter and am having

problems as follows.



The engine has very good compressions and a new bottom end so is tight but

easy enough to turn over by hand. Symptoms are that the starter finds it

very hard to get the engine over the first compression even when the engine

is warm, but when turning rotates the prop very very fast. The prop is wood

so very little flywheel effect.



The starter was "as new" second hand and has no obvious faults.

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nuckolls.bob(at)cox.net
Guest

Posted: Thu Feb 07, 2008 7:29 pm Post subject: Starter Woes : follow up

At 06:15 PM 2/7/2008 +0000, you wrote:



 	  Quote: 	
		  



All



Thanks for the suggestions on my initial posting. Outcome as follows:



Used voltmeter to check voltages during cranking - basically no 

significant losses between battery and starter BUT voltage collapsed to 

7.5 to 8.5 volts across the battery during cranking. According to 

Sky-tech's diagnostic chart this can only be a battery issue.



So used a large car battery to temporarily replace the PC680 and got 

acceptable cranking.

So replaced the PC680 - minor improvement over the old battery but not 

acceptable



Replaced the Magnaflite with a Sky-tech 149NL which is field wound and not 

permanent magnet, great cranking with both old and new battery.


	


  Interesting. Thanks for sharing the out come of your

  experiments. It's interesting to know that Sky-tech

  now offers a wound field model. When I was working

  with B&C we considered a PM version and decided against

  it as not consistent with the-best-we-knew-how-to-do.



  Bob . . .

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