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  #1  
Old 09-13-2016, 06:28 AM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Southeast
Posts: 663
Default Mag change

Anyone running Bendix mags on an IO540D4A5. Im switching away from the Slicks to the Bendix S-20 or S-200 mags. Any starting issues with them. Im not ready to go to the electronic mags yet. Maybe down the road.

Reason for the change. With all the comments on the forum made about Slick impulse mag issues, I call TCM and spoke to the Tech Rep. He is the same person who spoke at Oshkosh. The issue with the impuse mag only affects the ones installed on the fifth counter weight crankshafts on specific Lycomings, like the D4A5 series. According to this rep, the fifth counter weight crank is causing some potential castitrophic failures with the Slick impulse mag. He made no hesitation telling me to pull the Slick impulse mag and go to something else. Joe (tech rep at TCM) said this is not a TCM issue, it is a Lycoming issue. He told me that they (TCM) are pushing the FAA and Lycoming to issue a 100 hour repetitive inspection AD on the impulse mags, and may go as far as requesting an AD requiring removal of Slick impulse mags from all fifth counter weight Lycomings. I was told, as of now, they have no upcoming fixes to resove the problem, other then an AD. Soooooo, bye bye Slick mags.

Last edited by togaflyer : 09-13-2016 at 06:30 AM.
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  #2  
Old 09-13-2016, 06:44 AM
Auburntsts's Avatar
Auburntsts Auburntsts is offline
 
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Location: Tampa, FL
Posts: 2,861
Default

Another option is to replace the left impulse mag with a Slick retard breaker mag (6393). That's what I have and I also have it paired with a SlickStart--no starting issues whatsoever.
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Last edited by Auburntsts : 09-13-2016 at 07:01 AM.
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  #3  
Old 09-13-2016, 07:32 AM
Kellym Kellym is offline
 
Join Date: Aug 2005
Posts: 97
Default

Quote:
Originally Posted by togaflyer View Post
Anyone running Bendix mags on an IO540D4A5. Im switching away from the Slicks to the Bendix S-20 or S-200 mags. Any starting issues with them. Im not ready to go to the electronic mags yet. Maybe down the road.

Reason for the change. With all the comments on the forum made about Slick impulse mag issues, I call TCM and spoke to the Tech Rep. He is the same person who spoke at Oshkosh. The issue with the impuse mag only affects the ones installed on the fifth counter weight crankshafts on specific Lycomings, like the D4A5 series. According to this rep, the fifth counter weight crank is causing some potential castitrophic failures with the Slick impulse mag. He made no hesitation telling me to pull the Slick impulse mag and go to something else. Joe (tech rep at TCM) said this is not a TCM issue, it is a Lycoming issue. He told me that they (TCM) are pushing the FAA and Lycoming to issue a 100 hour repetitive inspection AD on the impulse mags, and may go as far as requesting an AD requiring removal of Slick impulse mags from all fifth counter weight Lycomings. I was told, as of now, they have no upcoming fixes to resove the problem, other then an AD. Soooooo, bye bye Slick mags.
I was given a choice by my engine shop of new Slick, or either variety of overhauled Bendix. I chose the S1200 model because of its superior high altitude performance. The downside is that the mags are so much larger than the Slick or Bendix S6 models that clearance with the firewall and the crankcase breather line is minimal. Also had to remove right mag to attach the engine mount to the engine. Performance is excellent. Getting mixture right for hot start is somewhat tricky, but engine runs great. Mag drop on runup is pretty much 100 rpm plus or minus 10 when checked at 1700. I've been up to 13500 with smooth running. LOP is no problem.
Until there is a six cylinder P Mag with some operational experience, I would make the same choice again.
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  #4  
Old 09-13-2016, 07:37 AM
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mikeyj350 mikeyj350 is offline
 
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Location: Cedar Rapids, IA / USA
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Default

For what it's worth, in the near-ish future (4-6 weeks?) I will be selling two Bendix 1200-series mags (IO-540) freshly overhauled by Eagle Magneto with yellow tags.

They currently have zero hours on them since overhaul, but the plan is to run them for up to 5 hours on a dyno after my engine is built and first-run at the overhaul shop. I'm installing dual LSE's on the airplane, so I'll be looking to sell the mags when I receive delivery of the engine.

Let me know if you are (or anyone else is) interested. I'll post a BST ad when they actually become available too.
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  #5  
Old 09-13-2016, 12:39 PM
rvator10 rvator10 is offline
 
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Location: Fountain Hills, arizona
Posts: 117
Default how about o-540 A4B5 engines

Question ?Slick impuse mag only affects the ones installed on the fifth counter weight crankshafts? does this also include 5th and 6th order O-540 A4B5 engines?
I once performed a spectral analysis and the 5th and 6th order IPS were negligible.
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  #6  
Old 09-13-2016, 12:52 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
Default counter example

Quote:
Originally Posted by Kellym View Post
I was given a choice by my engine shop of new Slick, or either variety of overhauled Bendix. I chose the S1200 model because of its superior high altitude performance. I've been up to 13500 with smooth running. LOP is no problem.
Until there is a six cylinder P Mag with some operational experience, I would make the same choice again.
I have the standard Slicks (retard, no impulse coupling) and have been to 17,900', LOP, no issues. (Plane would go higher but I dislike O2 masks).

I think the better high altitude performance doesn't show up until you're higher up in the flight levels, and/or have worn plugs.
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  #7  
Old 09-13-2016, 01:31 PM
AttackPilot64 AttackPilot64 is offline
 
Join Date: Dec 2014
Location: SPring lake NC
Posts: 120
Talking Mags

Do yourself a Favor and go with the EMAG PMAG electronic ignition. I can promise you, you will not be disappointed.
-Self sustaining during an electrical failure
- Superior performance
- Fuel savings
-can run auto plugs which saves big bucks
- Super easy to time
-lighter
-Extremely easy cold and hot starts. <--- Big plus for me! starts like a car.
- if you need it overhauled it will cost you a whopping 135 bucks. not that there is a time requirement. anything over 500-600 hrs in a bendix I start getting nervous.
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  #8  
Old 09-13-2016, 01:39 PM
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Auburntsts Auburntsts is offline
 
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Location: Tampa, FL
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Quote:
Originally Posted by AttackPilot64 View Post
Do yourself a Favor and go with the EMAG PMAG electronic ignition. I can promise you, you will not be disappointed.
-Self sustaining during an electrical failure
- Superior performance
- Fuel savings
-can run auto plugs which saves big bucks
- Super easy to time
-lighter
-Extremely easy cold and hot starts. <--- Big plus for me! starts like a car.
- if you need it overhauled it will cost you a whopping 135 bucks. not that there is a time requirement. anything over 500-600 hrs in a bendix I start getting nervous.
There is no 6 cyl pmag
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  #9  
Old 09-13-2016, 02:47 PM
paul330 paul330 is offline
 
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Location: Mpumalanga, South Africa
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Quote:
Originally Posted by Auburntsts View Post
There is no 6 cyl pmag
Well, there is, sort of...............

They are now promising (?) deliveries "soon" like they have for the last 3 years. I think the 4 cylinder version was a great leap forward but the P200 has been an ongoing disaster for whatever reason. I ended up with Slicks with the left retard breaker and SlickStart - works great.
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  #10  
Old 09-13-2016, 08:27 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Southeast
Posts: 663
Default

So after talking with my engine guy, Im switching to the Bendix S-20 series mag. putting impulse mags on both sides for easy start up. They have snap ring impulses so no rivet issues, and a typical 500 hour service. I will fly these for the first 500 hours and then see whats going on in the E mag world.
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