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Thread: Experimental ignitions systems choice

  1. #41
    skywagon8a's Avatar
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    Quote Originally Posted by Cub Builder View Post
    Absolutely right. But, if one installs a simple momentary emergency bypass switch to bypass the master relay, then you should have enough residual voltage to excite the alternator unless the battery is absolutely stone dead. Once the alternator starts charging and the voltage comes up, the master relay will latch closed.
    Agreed, but how many systems are planned to be operated with a dead battery?
    N1PA
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  2. #42

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    Any updates on recent builds and p mags? running 1 with bender/slick or 2 pmags?

  3. #43

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    My recently deceased engine had dual Pmags. My next one will arrive with dual impulse Slicks. I'm not sure whether the Pmags will get a replay. If I go back to electronic ignition I'm favoring Light Speed. Simple and effective. The big question will be whether I go electronic. I've talked to several good engine guys in the past few days. The range of opinions about ignitions varies more than anything engine related I know of.

  4. #44
    Steve Pierce's Avatar
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    Been maintaining quite a few Carbon Cubs with the Lightspeed system and have visited with Claus a little. I had an FX2 that had a crank sensor go bad. He was pretty short with me until he relized I had done my homework and troubleshoot it to the sensor which he had never had one fail. Help a guy Saturday who had one coil not firing and figured it had to be the sensor from his troubleshooting. He didn't realize there are 2 pickups in each sensor. i figured that out by not taking the backlash out of the crank the last time I double checked myself and called it good. The flywheel dug into it and exposed the sensors embedded in the unit. Turned out he had a hair of solder hanging between two pins on his harness. Easy fix.

    I have learned that the Lightspeed ignition system will fire a lean mixture, don't lean till rough and then enrichen. Go by temps and fuel flow to power. Also the system will run down to about 6.5 volts and then run another 30 minutes on the small Powersafe batteries that Cub Crafters installs in the back up system that you are suppose to replsce every year.
    Steve Pierce

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  5. #45

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    The leaning thing applies to Pmags, too. If I go Light Speed I anticipate the Hall Effect sensors. Anyone familiar with those? I may just stick with mags and try to convert to automotive wires and plugs. Another option.

  6. #46
    Gordon Misch's Avatar
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    The big question will be whether I go electronic. I've talked to several good engine guys in the past few days. The range of opinions about ignitions varies more than anything engine related I know of.
    Could you please elaborate on that some? Thanks.
    Gordon

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  7. #47
    hotrod180's Avatar
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    Quote Originally Posted by stewartb View Post
    .... The range of opinions about ignitions varies more than anything engine related I know of.
    Try asking those engine guys about running mogas.
    I've ran 87 octane unleaded ethanol-free mogas for years,
    generally mixed with 20-25% 100LL,
    and have never had any trouble with it.
    But I've heard a number of GA mechanics and engine rebuilder specialists condemn it's use--
    usually with very little real (aka verifiable!) reason.

    Oh yeah, ask them about lean of peak ops too.
    Or semi-synthetic vs regular oil -- or even multi-grade vs regular.
    Last edited by hotrod180; 03-01-2019 at 11:37 AM.
    Cessna Skywagon-- accept no substitute!
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  8. #48
    CamTom12's Avatar
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    Quote Originally Posted by stewartb View Post
    The leaning thing applies to Pmags, too. If I go Light Speed I anticipate the Hall Effect sensors. Anyone familiar with those? I may just stick with mags and try to convert to automotive wires and plugs. Another option.
    Definitely another option, but not one I’d go with or recommend.

    I really like the fact that an electronic ignition will advance at part throttle. Fixed timing is incredibly inefficient for anything other than WOT. And I think a hotter spark in all conditions is good for a complete burn, which is another benefit of more modern ignition systems.

    Unless all you ever do is fly WOT 100% of the time. If that’s the case then auto-plugs / wires on mags might do fine.

  9. #49
    DJ's Avatar
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    Quote Originally Posted by stewartb View Post
    My recently deceased engine had dual Pmags. My next one will arrive with dual impulse Slicks. I'm not sure whether the Pmags will get a replay. If I go back to electronic ignition I'm favoring Light Speed. Simple and effective. The big question will be whether I go electronic. I've talked to several good engine guys in the past few days. The range of opinions about ignitions varies more than anything engine related I know of.
    In my experience, Slick mags are still having problems with timing drift, as of one year ago. The quality of the parts seems suspect too. To be fair these were not brand new. They were a QAA rebuild with all "genuine" parts. They both drifted 7 degrees in the first 50 hours. If Bendix mags fit my lowered mount I would have them. Been there, tried that but ended up with Slicks. Click image for larger version. 

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    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  10. #50
    CenterHillAg's Avatar
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    Quote Originally Posted by DJ View Post
    If Bendix mags fit my lowered mount I would have them. Been there, tried that but ended up with Slicks.
    What sort of mount are you running, one of the lowered mounts like Javron makes? I read this a while back and forgot to ask, poked my head in a Super Cub cowling today and the Bendix mags looked tight in there as is. I could see where they wouldn’t fit on a lowered mount with different tubing geometry.

  11. #51
    DJ's Avatar
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    As far as I know it's a one-off mount by Dan Dufault. I think it might be lowered 1 inch, not 2 inches like Jay was doing.

    Sent from my SAMSUNG-SM-G900A using SuperCub.Org mobile app
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1
    Thanks CenterHillAg thanked for this post

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