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12-08-2013, 08:11 AM
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Join Date: Dec 2006
Location: Collinsville, IL
Posts: 620
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Fuel injection or electronic ignition
RV-6A with 0-320 E2D. If you only had the money for one or the other, which would you choose (and why)? Fuel injection or P-mags? Looking for the most bang for the buck.
Thanks for your thoughts.
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Don
VAF #1100, EAA864
-6A bought flying
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12-08-2013, 08:16 AM
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Join Date: Feb 2005
Posts: 1,082
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Electronic ignition. Adds a few extra hp and adds more to fuel efficiecy. Also is less expensive than mags over the long term. FI is a "nice to have" item but I don't miss it.
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Mike
JAMES AIRCRAFT.com
Flying - RV8 Hot Rod "Drone Killer"
Flying - RV8 "Look'n Good"
RV4 - FAST & FUN! Rebuilt, Flown, Sold
RV-7A Built, Flown, Sold
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12-08-2013, 09:25 AM
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Join Date: Aug 2011
Location: AZ
Posts: 186
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I am planning on starting with the EFII electronic ignition then adding the EFII electronic FI at a later time depending on how LOP ops and efficiency works out with just the electronic ignition. EI, IMO, is way more bang for the buck and easier to install, but the whole EFII system looks great. Hopefully we get a few more pireps on it in the next 6 months.
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12-08-2013, 09:37 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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I've never played with FI, but my sense is that a carb to FI retrofit is a more involved process than switching from magnetos to (say) Pmag's. If my assumption is correct, I'd go with FI initially, then upgrade ignition systems down the road...
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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12-08-2013, 09:44 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Electronic ignition is quickly becoming a "must have" because it benefits every aspect of the engine operating envelope from start, idle, cruise, and power. Fuel injection is nice, but really only outshines a carb in cruise efficiency or aerobatics. My vote: Ignition first, then look at injection.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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12-08-2013, 12:29 PM
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Join Date: Dec 2005
Location: Sydney, Australia
Posts: 427
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FI upgrade is going to be more expensive and a time consuming job.
Apart from the engine upgrade kit consider the fuel pump upgrades, both mechanical and electric, the cowling and FAB modification if you choose the Silverhawk system due to the extra length of the servo versus carb (approx 7/8") - I don't know the length of the AP servo so cannot comment. Other bits and pieces include the sniffle valve and throttle & mixture linkage modifications.
If you look carefully at the Lycoming Operators manual and compare the HP between the O and IO versions the carbureted engine give the same HP at about 1/2" less manifold pressure than the FI equivalent. This gives me some comfort in staying with the carb.
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Doug Gray
RV-6 completed, flying since July 2010
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12-08-2013, 02:09 PM
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Join Date: Feb 2006
Location: George West, TX
Posts: 567
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Ditto Mike & Michael on the EI. You won't regret it IMO.
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Deal Fair
RV-4 (N34CB)
George West, TX (8T6)
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12-08-2013, 02:24 PM
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Join Date: Aug 2006
Location: boynton beach fl
Posts: 210
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FI
I would think about doing what would be more difficult to build now because when you start flying, taking the airplane down to do upgrades is like going to the dentist. I would do the fuel injection and wire the pmags so when you decide to upgrade your conventional magnetos you can just plug them and go fly quickly. Just a thought. I have both and I must say the PMAGs are incredible with outstanding service.
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Carl Bridges
RV7 N278RV
NOW FLYING
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12-08-2013, 02:34 PM
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Join Date: Jan 2005
Location: England
Posts: 1,087
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Assuming you are flying I agree with all the above - Electronic Ignition no question as it is much easier to install. P-mags are the most straight forward, but even if you go with Lightspeed (or another) it isn't that difficult.
Installing Fuel Injection will mean a new cowl scoop as the injector is longer than the carb (or other cowl surgery), probably a new fuel pressure gauge (or at least a transducer), new piping and a whole lot more. It is also more expensive by at least $1K.
Both will produce around the same benefit in fuel savings terms, but EI will give a small gain in top end performance, especially up high.
Pete
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12-08-2013, 02:44 PM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Fuel injected for sure.
To operate at great efficiency requires the Fuel/Air ratios to be even. That can be achieved with injection, no Pmag can help that.
Sure we can get carb engines LOP, but best bang for buck will be an IO320. They are great engines made awesome by adding the I.
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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