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  #1  
Old 05-29-2022, 05:04 PM
JBrenneise JBrenneise is offline
 
Join Date: May 2022
Location: Campbell
Posts: 2
Default Variable ignition timing (100LL no longer available at RHV).

Is there such a thing as a kit to add variable ignition timing for GA aircraft?

Last edited by JBrenneise : 05-29-2022 at 08:42 PM.
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  #2  
Old 05-29-2022, 05:36 PM
KeithO KeithO is online now
 
Join Date: Jul 2010
Location: Jackson,MI
Posts: 39
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Heading and subject asking 2 different questions ??
I'm assuming variable valve timing is out unless you install a Viking engine.

Ignition, there are different options available.
article in Kitplanes magazine on the different options.
https://www.kitplanes.com/electronic-ignitions-2/
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  #3  
Old 05-29-2022, 05:38 PM
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1001001 1001001 is offline
 
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Don't forget SDS:
http://www.sdsefi.com/aircraft.html
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  #4  
Old 05-29-2022, 06:49 PM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 493
Default SDS to the rescue

Go with SDS fuel and ignition, EM-5F system, and your worries are over.
I have an 0-360 8.5 compression ratio and I run Costco premium.
Yes I have the 6 port Andair valve for return lines to tanks and all SS/teflon lines.
Starts same cold or hot.
Problem solved.
My three cents worth Art
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  #5  
Old 05-29-2022, 07:40 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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Default EFII

Love my EFII System32!
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Aerospace Engineer '88

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Garmin G3X-T, Barrett EFII S32, CAI, MTV-9B

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  #6  
Old 05-29-2022, 08:41 PM
JBrenneise JBrenneise is offline
 
Join Date: May 2022
Location: Campbell
Posts: 2
Default Dynamic spark advance.

By ignition timing, I mean advancing or retarding the spark to compensate for lower octane fuel(s).

Last edited by JBrenneise : 05-29-2022 at 08:43 PM.
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  #7  
Old 05-29-2022, 09:25 PM
KeithO KeithO is online now
 
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Location: Jackson,MI
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If you mean flex fuel type capability (to adjust automatically based on onset of detonation) I am not sure anyone has that capability for air cooled engines. First of all the heads are too hot to mount regular knock sensors (designed for water cooled engines). Secondly I doubt that suitable locations for the knock sensors would be available.

I think any electronic ignition system would be set up for a particular fuel and thats it. For tuning, sensors and signal conditioning systems are available to be able to detect detonation very early (sending a signal out to a pair of headphones) with great sensitivity and the timing tables would then be adjusted accordingly and then locked.
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  #8  
Old 05-29-2022, 11:14 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
Posts: 4,386
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Here is a system that will allow to match your timing to your situation..... http://www.sdsefi.com/cpi2.htm
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  #9  
Old 05-30-2022, 06:41 AM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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With SDS CPI, CPI-2 or EM-5 systems, ignition timing is user programmable.

When burning 91 Mogas and using std compression ratios we normally retard timing at high MAP around 3-5 degrees so total timing might be around 20 degrees at 30 inches and then as MAP drops, we slowly bring more timing in so the full 25 deg is in at 25 inches and below. This is all automatic once programmed.

There will be a slight drop in takeoff power (around 6-7 hp on a 360) but cruise power and economy are unaffected above about 5000 MSL.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 456.0 hrs. on the Hobbs,
RV10 95% built- Sold 2016
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  #10  
Old 05-30-2022, 07:32 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
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SDS is good stuff - I love it in my plane.
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N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!
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