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  #11  
Old 01-18-2016, 06:48 AM
Mike H Mike H is offline
 
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Quote:
Originally Posted by Jesse View Post
I'm sure there is a good reason why Van's only sells engines with the RB Mag, but doesn't include the necessary SlickStart box, but I can't imagine what it is.
I read a post here a couple of years ago regarding the same question. The response indicated that Lycoming stopped using impulse coupling mags on the 540 engines years ago due to harmonic resonance that causes impulse coupling failure. I have not personally confirmed this information, but it seems plausible. An impulse coupling pawl failure on a running engine will cause lots of damage and may ruin you're day.
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  #12  
Old 01-18-2016, 06:52 AM
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Jesse Jesse is offline
 
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I was more so questioning not including the SlickStart when it is obviously needed.
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  #13  
Old 01-18-2016, 07:03 AM
Mike H Mike H is offline
 
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Angry

Yeah that's a good question as well. They supply the rest of the ignition system, so why not the required starting booster? They want way too much for that box. Have you tried looking for a "non-aviation" version? I bet there were retard breaker magnetos and starting boosters installed on some sort of machinery in the past.
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  #14  
Old 01-18-2016, 08:14 AM
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awmuhs awmuhs is offline
 
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Location: Tucson, Az
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Default Slickstart

So I think what you all are telling me is that with nothing connected to the RB terminal the RB does nothing to help me start the engine.

In addition for reliable starting I really need Slicstart or a vibrator connected to the RB terminal.

Yes to both?
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  #15  
Old 01-18-2016, 08:39 AM
aerhed aerhed is offline
 
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That's right. Without the tard box both mags are striking @ 25BTC always. With no retard mechanism you are at greater risk to kickbacks.
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  #16  
Old 01-18-2016, 08:45 AM
Evolution10 Evolution10 is offline
 
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I received my Lycoming Thunderbolt engine just over a year ago. It was spec'd with two impulse mags - no problem with the request.
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  #17  
Old 01-18-2016, 08:46 AM
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Raymo Raymo is offline
 
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Default E-Mag?

For the price of the SlickStart box, you might want to consider spending a little more and upgrading to a P-Mag. The extra cost is said to slowly disappear with better performance and efficiency. Plus it will take care of that starting problem.
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  #18  
Old 01-18-2016, 08:50 AM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Quote:
Originally Posted by awmuhs View Post
So I think what you all are telling me is that with nothing connected to the RB terminal the RB does nothing to help me start the engine.

In addition for reliable starting I really need Slicstart or a vibrator connected to the RB terminal.

Yes to both?
Not quite. The retard mag, just as its name implies, retards the timing at very low rpm so that the points open and the spark fires (if enough voltage) close to top dead center. If you attempt to start on the mag without the RB it will attempt to fire 25 deg before TDC, and at low rpm there is the chance of a kick-back, where the engine suddenly stops and turns in reverse a bit, which tends to break starter gear teeth. So the RB is doing something for you now, but only half of what it should (without the slickstart you have low firing voltage).

I agree with other posts that the plans and/or order forms from Vans are not crystal clear. I didn't realize the stock engine did not have impulse couplings until I got it.
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  #19  
Old 01-18-2016, 08:57 AM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by Raymo View Post
For the price of the SlickStart box, you might want to consider spending a little more and upgrading to a P-Mag. The extra cost is said to slowly disappear with better performance and efficiency. Plus it will take care of that starting problem.
Last time I checked they had yet to ship a 6-cyl p-mag after years of effort. Has that changed?
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  #20  
Old 01-18-2016, 09:12 AM
F1R F1R is offline
 
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Quote:
Originally Posted by awmuhs View Post
I have a Vans IO540 on my RV10. I have been flying it for about 18 months and have recently been having trouble starting it mainly when it is hot.

When i was building the plane I was not very knowledgeable about what a retard breaker (RB) mag is. In fact I thought I had an impulse coupling mag on the left side. I recently found out it isn't. It's a RB.

I have been learning more about the difference between mags recently but do not know how an RB mag that doesn't have the RB terminal connected to anything behaves.

I have been flying without a vibrator box or Slckstart on the left side. How does this affect my ability to start the airplane??
Just install a slick start module as in the instructions and your 540 will start like it has an electronic ignition. Hot or cold. They can also be installed with an impulse mag, but there are separate instruction pages, so be sure an use the instructions appropriate for the 6393 retard breaker mag.

Happy starting
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