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  #1  
Old 06-09-2017, 07:33 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 4,962
Default IO-540/retard mag

Today I was checking out the new owner of a -10 in the presence of the builder. The plane had two toggle switches (on/off) for the mags. I asked the builder if the left mag was the retard one, and he replied that neither mag had retard points, but that was okay since both had shower of sparks. I guess he saw my odd look, because he became defensive, asked if I was an A&P. I advised the new owner to really find out what mags were there, and if they really had no retard points that there was a non-zero chance of a kick-back and broken gear teeth. What say you? Am I all wrong here?
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  #2  
Old 06-09-2017, 08:32 PM
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Jesse Jesse is offline
 
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,356
Default

I'd be willing to bet that one is a retard mag unless it has an impulse coupling. Best option is to pull the top cowl and have a look.
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  #3  
Old 06-09-2017, 10:13 PM
eaglen92ce eaglen92ce is offline
 
Join Date: Oct 2009
Location: Chandler, AZ
Posts: 153
Default

If either mag has an impulse coupling you should be able to hear it snap when pulling the prop through by hand (mags off of course!!). That would not answer which one it was though.
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  #4  
Old 06-10-2017, 06:24 AM
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RONSIM RONSIM is offline
 
Join Date: Feb 2008
Location: Largo, FL
Posts: 804
Default Hard starts

Our new (OH) IO 540 for the RV-10 came with retard (no impulse), and no Slickstart -- took me over a year to figure out why our starts were difficult, and even impossible, when hot. Installed Slickstart and problem went away.

Ron
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  #5  
Old 06-10-2017, 10:34 AM
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Lenny Iszak Lenny Iszak is offline
 
Join Date: Sep 2008
Location: Palm City, FL
Posts: 227
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My engine came from Van's in 2009 with a straight and a retard mag. Never seen a retard mag before and looking into it I figured out that I needed a SlickStart for it to start reliably. Not sure why that wasn't included in the kit or at least offered as an option. Maybe it was and I overlooked it.

Technically you can hook up a SlickStart to a straight mag using the wiring diagram intended for impulse coupled mags, but that would be bad as there will be nothing to retard the ignition. Not good.

I'm with Jesse, he most likely has a retard mag. At least I hope so
If he really has two straight mags with shower sparks, he's got a more thorough inspection to do...
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2014 RV-10, N311LZ - 380 hrs

Last edited by Lenny Iszak : 06-10-2017 at 02:59 PM. Reason: spelling
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  #6  
Old 06-10-2017, 02:00 PM
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awmuhs awmuhs is offline
 
Join Date: Jun 2013
Location: Tucson, Az
Posts: 121
Default Slick start

I had same experience as RONSIM. I do not understand why there isn't more info on slick start provided with the Vans IO540 engine configuration.
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