Lycoming New Electronic Mag Osh 2019

[mcgaughy]

I just installed the Surefly on my Grumman Tiger (via STC) a few weeks ago. I tied the manifold pressure to a fitting I installed on a cylinder plug (located above the primer nozzle). The unit works well. I replaced the left mag so I could get rid of the impulse coupling. About the same weight as a slick magneto and probably won't have to retime or do any maintenance to it. While it doesn't have the internal power generation of a p-mag, I believe it is more simple and less prone to malfunction than the p-mag (however, it needs an external power source to operate properly).

Ellis.
A&P / IA
RV 7a bulder

[PilotjohnS]

The real reason I would choose the Surefly over the PMag is that the Surefly doesn't run software. They use a PLD, or Programable Logic Device. This has the firmware burned in and is hardened against software glitches caused by muon particles and such. To me this is the minimum requirement. Being a software guy, I dont like software controlled critical systems. Ya I know, all EFIS’s are software driven, but those are redundant on many levels.

[RONSIM]

I have my Surefly on order to replace my Bendix impulse mag -- also have a "Slick-type) harness on order. I have run the power wire with the 10A fuse from the battery, and ready to go on the install ----

My choices are to hook it up as "fixed" timing (25*) or hook up the MAP for automatic timing advance. My engine is a Lyc O360A1A with added FI and Hartzell CS. My average flying is mostly hamburger runs, instrument currency, "play-time" and the occasional cross country -- most everything at less than 10K MSL. I average 50-60hrs /yr on this machine.

So, question for those with EIs with and without advance -- for my profile, any advantage/disadvantage to going with the timing advance hookup?

Thanks for the help,

Ron

[texdog]

I second Ron?s question. We do a lot of cross country and some high altitude. I?m due a 500 hour AD now. This seems like a good option. Thanks

[flysrv10]

Surely is offering 15% discount right now.

[DanH]

Plenty of opinions. Data here:

https://www.danhorton.net/Misc/Nigel...Advance%20.pdf

Other than running a MAP line, there is no installation difference. If you want to try both fixed and variable timing, you'll need to pull it off the accessory case to change the DIP switch settings.

[BillL]

What is the SureFly advance curve (vs MAP) for the parallel valve? I looked at all the literature and can not find that.

[DanH]

Originally Posted by BillL

What is the SureFly advance curve (vs MAP) for the parallel valve? I looked at all the literature and can not find that.

Was on the home page, but not now. They may have made some changes.

[71459]

Sorry if this is a dumb question, but how does it work when running a single electronic mag with variable advance timing? In this case you would have an electronic mag with variable advance timing next to a conventional mag with fixed timing. Obviously, this mismatch would not work.

[scard]

Originally Posted by 71459

Sorry if this is a dumb question, but how does it work when running a single electronic mag with variable advance timing? In this case you would have an electronic mag with variable advance timing next to a conventional mag with fixed timing. Obviously, this mismatch would not work.

It does work (rough, simplistic statement). The one that successfully lights the fire first wins.