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 05-20-2022, 07:17 AM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Fl/Ga
Posts: 844
Default Surefly ignition in the -10

For those with an IO 540 in their -10 with a Surefly ignition (single install) questions????

Are you using the fixed timing or the advance timing settings….

For those that allow timing advance, what CHT increases have you seen, especially on hot days. I fly out of the Florida Keys a lot.

Are you using massive or fine wire plugs and what plug gap have you found works best.

I have a Bendix impulse mag that will remain on the left side. Does it need to be grounded for the start or let it fire off also.

Any recommendations on the install.

Thanks much…..
__________________
Rich Gurr
RV 10 924RL
9A0 & FD51
Reply With Quote
  #2  
Old 05-20-2022, 07:52 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 7,153
Default

No surefly, but do have EI in my 10. I feel that I am saving close to one GPH at cruise by having more than 25* of advance, along with balanced injectors. I flew back from Iowa yesterday and at 7K' was getting 165Ktas at 10.5 GPH. At 14K' I get 165 around 9 GPH.

My system is variable via my choosing, not just a fixed advance table. I do have multiple tables for ROP/LOP as well as a knob to increment/decrement from those tables. I run 23* at 29" and this goes up as the MAP decreases. That said, I need to run lower advances if I am climbing ROP. MAP decreases as you climb and therefore a stock adv table will keep advancing eventhough you are ROP and it is raising CHTs with no performance benefit. In these cases, CHTs can climb 30-40* or more beyond a lower advance. If I am climbing LOP, then the advance is beneficial and have no CHT issues.

I am a true believer in the benefits of advance for LOP cruise, but not so much with those systems that have unchangeable advance schedules. I would recommend the SDS system, as it allows you to build tables that truly work and gives you a manual switch to go between tables you build for LOP and ROP operations. This is a HUGE benefit IMHO.

Lean mixtures like more advance & rich mixtures do not. Gross simplification and you can search here for more details.

When the advance is matched to the conditions, you WILL NOT have CHT issues. If you can't properly match the advance to the conditions, you likely will see elevated CHTs, when ROP, compared to 25* fixed mags in the climb phase-especially above 6-8K'. A surefly with fixed 25* advance will behave exactly the same as your mag.

Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019

Last edited by lr172 : 05-20-2022 at 08:04 AM.
Reply With Quote
  #3  
Old 05-20-2022, 08:09 AM
rvanstory's Avatar
rvanstory rvanstory is offline
 
Join Date: Dec 2016
Location: New Braunfels
Posts: 501
Default

Quote:
Originally Posted by togaflyer View Post
For those with an IO 540 in their -10 with a Surefly ignition (single install) questions????

Are you using the fixed timing or the advance timing settings….

For those that allow timing advance, what CHT increases have you seen, especially on hot days. I fly out of the Florida Keys a lot.

Are you using massive or fine wire plugs and what plug gap have you found works best.

I have a Bendix impulse mag that will remain on the left side. Does it need to be grounded for the start or let it fire off also.

Any recommendations on the install.

Thanks much…..
I’m have SureFly set with variable timing. Have not “compared” CHT’s to fixed timing, so no data to offer. But, took off yesterday from Abilene TX when OAT was 108 degree’s. Hottest CHT (#6) got to 419. I know many are scared to ever get above 400, but I’m ok with 419 as it was very temporary on climb-out. My personal max on climb out CHT is 430. Lycomings can handle it just fine. In cruise it was 380. Others around 360. On “normal” summer days in South Texas, hottest climb out CHT is 410 and cruise is 370.

On plugs, I use fine wire. If I recall correctly, gaps on Slick Mag set to .016. SureFly EI set to .025. I think you can go up to .030 on SureFly if you want.

Call SureFly tech support. They will know best.
__________________
Randy Vanstory
Flying RV10 - N783V
2021 Sun N Fun Reserve Grand Champion
2021 Oshkosh Bronze Lindy

1st Flight 08/20/2020 / Current Hrs - 279
Donation Happily Made 2022
Reply With Quote
  #4  
Old 05-20-2022, 04:50 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Fl/Ga
Posts: 844
Default

Larry thanks for the input. I’m not at the level to want to be manually adjusting my timing. That is for much smarter people then I. Randy, did you gap your fine wires to 25. Did you have any issues with bending the tab. I read where there have been issues with breaking when bending them.
__________________
Rich Gurr
RV 10 924RL
9A0 & FD51
Reply With Quote
  #5  
Old 05-20-2022, 06:06 PM
rvanstory's Avatar
rvanstory rvanstory is offline
 
Join Date: Dec 2016
Location: New Braunfels
Posts: 501
Default

Quote:
Originally Posted by togaflyer View Post
Larry thanks for the input. I’m not at the level to want to be manually adjusting my timing. That is for much smarter people then I. Randy, did you gap your fine wires to 25. Did you have any issues with bending the tab. I read where there have been issues with breaking when bending them.
I did bend my own, but bought the tool from ACS for that purpose. Tempest will do it for you. But shipping costs are more than the tool. It was simple and straightforward.https://www.aircraftspruce.com/catal...lickkey=205315
__________________
Randy Vanstory
Flying RV10 - N783V
2021 Sun N Fun Reserve Grand Champion
2021 Oshkosh Bronze Lindy

1st Flight 08/20/2020 / Current Hrs - 279
Donation Happily Made 2022
Reply With Quote
  #6  
Old 05-21-2022, 01:02 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Fl/Ga
Posts: 844
Default

Thanks. I found this from Tempest. They go to 36 on fine wire for e mags.

Standard Ignition Fine Wire spark plugs are gapped to 0.017” – 0.021” from the factory and High Energy Electronic Ignition Fine Wire spark plugs are gapped to .036” from the factory. The side wire itself should be flush with the top of the center electrode. If the gap exceeds this tolerance, the side wire can be gapped during regular maintenance. The Iridium material has outstanding resistance to electrical erosion, but is very brittle. Using small needle-nose pliers, grasp the side wire perpendicular to the face of the plug. Smoothly twist the pliers one time only to achieve the proper gap. There is very little spring back at the electrode when bending. Any additional adjustments are not recommended due to the brittle nature of the material.
__________________
Rich Gurr
RV 10 924RL
9A0 & FD51
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 02:56 PM.


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.