VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 12-19-2020, 09:51 PM
Andrew Anunson Andrew Anunson is online now
 
Join Date: Apr 2012
Location: Pound, VA
Posts: 194
Default One Magneto, One EI

I have heard that running one magneto, one EI is hard on the mag because the EI runs with advanced timing and the mag does not. Is there any truth to this?
Reply With Quote
  #2  
Old 12-19-2020, 10:40 PM
JDeanda JDeanda is offline
 
Join Date: Apr 2013
Location: Ventura, CA
Posts: 226
Default Hard on the Mag??

Huh? I've been to two county fairs and a goat race and I've never heard such a thing. We run a LightSpeed Plasma III ignition and a Slick mag on our RV-6 and neither has ever missed a single spark.
Reply With Quote
  #3  
Old 12-19-2020, 11:13 PM
Tandem46's Avatar
Tandem46 Tandem46 is offline
 
Join Date: Jan 2005
Location: CO
Posts: 655
Default

Iíll second that. LSE Plasma II EI with one Mag. No issues for 1200hrs.
__________________
RV-7 Flying since 2004
1,100 hrs+
Reply With Quote
  #4  
Old 12-19-2020, 11:21 PM
Papa Papa is offline
 
Join Date: Apr 2007
Location: Las Vegas, NV
Posts: 124
Default

Same for me...one LSE and one mag...works great. I suspect the EI does all the heavy lifting, when I do a mag check on run up, I get a 50-75 RPM drop with only the magneto selected, but no RPM drop when only the EI is selected. For practical purposes, the magneto is really just backup if the EI fails.
Reply With Quote
  #5  
Old 12-20-2020, 12:41 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,686
Default doesn't know

The mag doesn't know that the EI just sparked the fuel - it just keeps sparking.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #6  
Old 12-20-2020, 03:36 AM
Captain Avgas Captain Avgas is offline
 
Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,935
Default

Quote:
Originally Posted by Andrew Anunson View Post
I have heard that running one magneto, one EI is hard on the mag because the EI runs with advanced timing and the mag does not. Is there any truth to this?
No truth whatsoever. The smart money is on one EI and one magneto...best of all worlds.
__________________
Youíre only as good as your last landing
Bob Barrow
RV7A
Reply With Quote
  #7  
Old 12-20-2020, 03:56 AM
pierre smith's Avatar
pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,894
Default Yep

12 years on the RV-10 and the EI sure makes for easy hot starts...

Regards,
__________________
Rv10 Sold
46 years ag pilot/CFI
Air Tractor 502/PT-6
Building RV-12, Wings, fuse, emp complete. FWF in progress.
Reply With Quote
  #8  
Old 12-20-2020, 04:34 AM
plehrke's Avatar
plehrke plehrke is offline
 
Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,752
Default

Quote:
Originally Posted by Andrew Anunson View Post
I have heard that running one magneto, one EI is hard on the mag because the EI runs with advanced timing and the mag does not. Is there any truth to this?
How does the mag get any feedback from EI firing? I donít see a feed back mechanism since all a mag knows is the drive gear is turning.
__________________
Philip
RV-6A - flying 970+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
Reply With Quote
  #9  
Old 12-20-2020, 07:49 AM
sam@riddlehill.com sam@riddlehill.com is offline
 
Join Date: Oct 2020
Location: Malden, MO
Posts: 25
Default

So, if I may speculate for my own educational purposes...the timing of the mags is not the same, there is no synch mechanism, no feedback between the mags is required. (Thanks to RV8CH) I’m thinking that doesn’t matter due to the fact that when flying low, the sparks are in synch, and at altitude the slick has fired into a cylinder that has already been fired by an “advanced” spark from the lightspeed, thereby making the slick mag spark no harm/no help? I would also assume that the one slick mage is an impulse type, so as to not to interfere with a smooth start? (This is likely basic stuff..I’ve been out of the recip world for i while).
__________________
Sam
SEMO
Emp. complete
Waiting on RV-8 QB Fuse/Wing
currently (over) analyzing the options.
2021 donationÖcheck
Reply With Quote
  #10  
Old 12-20-2020, 02:42 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,313
Default

Quote:
Originally Posted by sam@riddlehill.com View Post
? I would also assume that the one slick mage is an impulse type, so as to not to interfere with a smooth start? (This is likely basic stuff..Iíve been out of the recip world for i while).
Most Lycoming engines are set up to start on one ignition only, so most owners choose to start on the EI and use a non-impulse mag on the other side, grounded out during start.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:54 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.