RV-List Digest Archive

Sun 04/19/09


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 05:04 AM - Re: What Ignition to buy? (straight-n-level)
     2. 06:12 AM - Re: Re: What Ignition to buy? (Kevin Horton)
     3. 06:50 AM - What Ignition to buy? (Bill Judge)
     4. 07:10 AM - Re: What Ignition to buy? (Sam Buchanan)
     5. 07:09 PM - PMag CHT data? (J Riffel)
     6. 08:13 PM - Re: PMag CHT data? (richard sipp)
 
 
 


Message 1


  • INDEX
  • Back to Main INDEX
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 05:04:38 AM PST US
    Subject: Re: What Ignition to buy?
    From: "straight-n-level" <2ghostly@gmail.com>
    Wow, A person could write a book on this topic. Thank you for all the insight and your experiences with the different types of electronic ignition systems. This information from the end user is great. I got a little info. /sensory over loaded, but Im ok. I have been reading up more on the different ignition system web sights also. I like how some systems offer the option of the auto spark plug conversion. Looks like this is common with most of the systems and a good way to go. They all seem to advance the timing. Im not really clear on why and when with such a small rpm operation window. Is it certain throttle settings, under take-off for more power? I do understand most of the reasoning though from being involved with automobile repair/technology. Here it is mostly for its fuel economy and drivability, stop and go. Thank you all, and I really appreciate all this information to help me make an educated choice. Sincerely, T. Mitchell Read this topic online here: http://forums.matronics.com/viewtopic.php?p=240065#240065


    Message 2


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 06:12:41 AM PST US
    From: Kevin Horton <khorton01@rogers.com>
    Subject: Re: What Ignition to buy?
    On 19 Apr 2009, at 08:02, straight-n-level wrote: > A person could write a book on this topic. Thank you for all the > insight and your experiences with the different types of electronic > ignition systems. This information from the end user is great. I got > a little info. /sensory over loaded, but Im ok. I have been > reading up more on the different ignition system web sights also. I > like how some systems offer the option of the auto spark plug > conversion. Looks like this is common with most of the systems and a > good way to go. They all seem to advance the timing. Im not > really clear on why and when with such a small rpm operation window. > Is it certain throttle settings, under take-off for more power? I do > understand most of the reasoning though from being involved with > automobile repair/technology. Here it is mostly for its fuel economy > and drivability, stop and go. Thank you all, and I really appreciate > all this information to help me make an educated choice. At high manifold pressure, like during takeoff or climb, there is risk of detonation if the timing is too far advanced. under these conditions, all electronic ignition systems, E-mag/P-mag, Unison Laser, etc will set the timing at about the same place it would be with a mag. Thus there is probably very little, if any, advantage from these systems at high power. But, at lower MP, even at high rpm, like high altitude cruise, the timing can be advanced another 20 or so degrees, with no risk of detonation. All these other systems sense MP, and they advance the timing as a function of MP and rpm, to achieve more power for a given fuel flow. -- Kevin Horton (Grounded) RV-8 (Flight Test Phase) Ottawa, Canada http://www.kilohotel.com/rv8


    Message 3


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 06:50:43 AM PST US
    Subject: What Ignition to buy?
    From: Bill Judge <bjudge@gmail.com>
    As far as elelctronic ignition goes I really like the lightspeed but the mag hole driven solutions may be mature enough to consider. I have been running dual lightspeed from the get go. I have a friend who crosses ocean in single engine planes, he has been running one of the mag hole brands on his Lancair and says he likes them. With that said I have also seen a lot of flap on various lists about them having problems: http://www.cozybuilders.org/Emagair_Warning/ The huge advantage of the mag hole solutions is the easy install and not worrying about any additional wiring for power and sensors. Lightspeed requires sensors to be mounted either on the front of the engine or in one mag hole and it also derives power from your electrical system so the install is a bit more involved especially if you go with dual electronic ignition since then you need a second battery. So, in summation if I was shopping around for ignition I'd give the emag and pmag solutions a good look. By look I mean talking to guys who run the system rather than guys selling it! There are even some others that "overlay" your mag system, one of those makes sparks continually through like 30 degrees crank rotation but I don't know anything about them other than thinking that they sound like the worst of both worlds: heavy failure prone mags with vagaries of a new system. the 30 degree thing sounds like snake oil too. The reason to go to electronic would be getting away from the 4-700 hr MTBF of mags. Getting away from expensive plugs, 10% better economy, ease of running lean of peak, and easy starting from a hot spark is nice too. The overlay solutions are non starters since you don't get rid of the least reliable part of your engine. Bill Judge N84WJ, RV-8 350 hrs


    Message 4


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 07:10:32 AM PST US
    From: Sam Buchanan <sbuc@hiwaay.net>
    Subject: Re: What Ignition to buy?
    Bill Judge wrote: > There are even some others that "overlay" your mag system, one of those > makes sparks continually through like 30 degrees crank rotation but I don't > know anything about them other than thinking that they sound like the worst > of both worlds: heavy failure prone mags with vagaries of a new system. the > 30 degree thing sounds like snake oil too. > > The reason to go to electronic would be getting away from the 4-700 hr MTBF > of mags. Getting away from expensive plugs, 10% better economy, ease of > running lean of peak, and easy starting from a hot spark is nice too. The > overlay solutions are non starters since you don't get rid of the least > reliable part of your engine. I find the "overlay" idea to be an intriguing option. One is the G3i system: http://www.g3ignition.com/index.html It is based on the MSD ignition module which has a field history of at least a couple of decades in the high performance car and boat communities. Spreading the spark out over many degrees of crank rotation is a major feature of the MSD and well-proven. I like how you get the advantages of a solid-state ignition along with automatic and complete magneto backup if the electronic module goes off line for some reason. Taking a peek at the internals of the mags every 500 hours isn't a major issue for me. Sam Buchanan


    Message 5


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 07:09:13 PM PST US
    Subject: PMag CHT data?
    From: J Riffel <riffeljl@gmail.com>
    I'm curious what CHTs others w/ EMag/PMags are getting. This is what I get: MAP 23.2 RPM 2400 at 5300' and getting CHTs of 356, 394, 373, 398 with about 58 hrs on a new IO360. EGTs are 1392, 1423, 1415, 1393. Thanks in advance. "Jerry


    Message 6


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 08:13:39 PM PST US
    From: "richard sipp" <rsipp@earthlink.net>
    Subject: Re: PMag CHT data?
    Jerry: Which RV are you flying? Dick Sipp ----- Original Message ----- From: J Riffel To: rv-list Sent: Sunday, April 19, 2009 10:07 PM Subject: RV-List: PMag CHT data? I'm curious what CHTs others w/ EMag/PMags are getting. This is what I get: MAP 23.2 RPM 2400 at 5300' and getting CHTs of 356, 394, 373, 398 with about 58 hrs on a new IO360. EGTs are 1392, 1423, 1415, 1393. Thanks in advance. "Jerry




    Other Matronics Email List Services

  • Post A New Message
  •   rv-list@matronics.com
  • UN/SUBSCRIBE
  •   http://www.matronics.com/subscription
  • List FAQ
  •   http://www.matronics.com/FAQ/RV-List.htm
  • Web Forum Interface To Lists
  •   http://forums.matronics.com
  • Matronics List Wiki
  •   http://wiki.matronics.com
  • 7-Day List Browse
  •   http://www.matronics.com/browse/rv-list
  • Browse RV-List Digests
  •   http://www.matronics.com/digest/rv-list
  • Browse Other Lists
  •   http://www.matronics.com/browse
  • Live Online Chat!
  •   http://www.matronics.com/chat
  • Archive Downloading
  •   http://www.matronics.com/archives
  • Photo Share
  •   http://www.matronics.com/photoshare
  • Other Email Lists
  •   http://www.matronics.com/emaillists
  • Contributions
  •   http://www.matronics.com/contribution

    These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.

    -- Please support this service by making your Contribution today! --