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  #11  
Old 02-01-2015, 06:34 AM
paul330 paul330 is offline
 
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Thanks everyone - think I now have the info I need
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  #12  
Old 03-20-2015, 09:34 AM
paul330 paul330 is offline
 
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Looks like I need another bit of info. Do Slick mags come with a RPM sensor fitted? I see in Aircraft Spruce, the Hall effect sensors are pretty pricey but they say "replacement"

If not, I assume you can sense the high volt output?
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  #13  
Old 03-20-2015, 10:31 AM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by paul330 View Post
Looks like I need another bit of info. Do Slick mags come with a RPM sensor fitted? I see in Aircraft Spruce, the Hall effect sensors are pretty pricey but they say "replacement"

If not, I assume you can sense the high volt output?
No. My RPM sensor came with the sensor package associated with my EFIS. In my case a UMA T1A9-1 for my Garmin G3X. Best answer is to get with whomever made your Tach, whether it be digital or analog, and see what they recommend as the solution may not involve the mags at all.
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Last edited by Auburntsts : 03-20-2015 at 10:34 AM.
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  #14  
Old 03-20-2015, 11:14 AM
douglassmt douglassmt is offline
 
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I have the same engine with a Slick mag on the left and Lightspeed on the right. Starts first time every time. Almost no mag drop on the Lightspeed alone, it is very efficient.

My sensor package from Advanced Flight included an rpm sensor that screws into the side of the Slick mag.
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  #15  
Old 03-22-2015, 10:05 AM
paul330 paul330 is offline
 
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Thanks again.

I have Skyview and they don't do a RPM sensor. The manual shows how to use a straight pick off from the P-lead with a resistor. Think I'll try that before forking out $$$$$.....
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  #16  
Old 03-22-2015, 10:28 AM
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Toobuilder Toobuilder is offline
 
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Sounds like you have what you need but just for info, I also have a D4A5 with Slicks... I have no impulse coupler nor a slick start vibrator and it starts fine with massive electrode plugs.
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  #17  
Old 03-22-2015, 10:43 AM
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vlittle vlittle is offline
 
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I had a lot of trouble with the p-lead pickup recommended by the SkyView install. I have a single Slick plus Electroair. In order to analyze the problem, I purchased a portable digital sampling oscilloscope and captured p-lead waveforms in flight.

What I found was a complex, variable amplitude waveform that depends on external factors... Compression ratio, Cylinder number RPM, MAP, plug gap etc. a 'one size fits all' resistor value did not work.

Since I get juiced by solving technical problems, I decided to develop the P-TACH magneto p-lead pulse stabilizer. (see link).

I posted the design as an Open-source project, but it can procured as a completed device. I think the variable reluctance sensors that mount to the magneto are fine as well, as long as you want to run the wires.

Something this simple shouldn't be so complicated and 90% of installations don't seem to have probems. The rest of us have that odd combination of circumstances that require help.
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