IO-720 Lycoming Fuel Injection Alternatives

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Sjteuton
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IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sat Aug 12, 2017 1:56 pm

I would like to get rid of the Lycoming Injection and go to something better. Any suggestions. I really don't want to spend thousands to do so. Can it be converted to an auto injection system? Let me know your thoughts?

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby GMAC 76 » Sat Aug 12, 2017 5:14 pm

seen a 720 in Nebraska some years ago that had a real nice adapter welded up similar to the units they use on the SC480'S ....it was hooked up to the front of the sump intake with a 4 barrel carb mounted on top out in front of and in between the mags...seemed to work really well but man did that engine like the avgas

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sat Aug 12, 2017 9:27 pm

I wish someone had a picture of that. Not sure how this would happen. This motor is an upstack so it limits space unless you work between the fuel tank and the sump. The one thing I have already done which has been the best move since owning this motor is installing a pacemaker and getting rid of the 1200 series bendix mags.

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby GMAC 76 » Sat Aug 12, 2017 10:10 pm

if I remember right the adapter on this 720 was bolted to the front of the sump where the servo bolted up...looked like 4-5" dia aluminum pipe tur
ned up 90 degrees with a plate welded to the pipe to accept the carb.....it was not an upstack but I don't know what difference the sump is on an upstack

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 7:12 am

The sump opening to the servo is facing the prop on the back of the motor. I will take some pics and post shortly. I think that will help tell the story.

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 8:36 am

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Sjteuton
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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 8:39 am

IMG_3058.JPG

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby GMAC 76 » Sun Aug 13, 2017 10:49 am

yes sir you are certainly right...maybe the difference between upstack and regular exhaust or the airplane or helicopter application of the engine...either way it sure wont work on your engine his carb was just a little forward of where the oil filter is on your setup....good luck to ya hope ya find a better way

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby CRACKERSTYLE » Sun Aug 13, 2017 2:20 pm

Do you still have the 1200 series mags for sale?
John 3:16

Sjteuton
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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 2:49 pm

No I sold them.

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 2:53 pm

Could you use an aircraft carburetor on it if I built mounting tube for it? I wish I knew more about auto injection, I can't see why it would not work if it is electronic.

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby GMAC 76 » Sun Aug 13, 2017 4:07 pm

I don't think any aircraft carb at least that I am aware of would handle 720 cubic inches....couldn't flow enough air or fuel...I have seen a super charged 480 engine that was equipped with dual MA-6AA CARBS side by side on a Y pipe into a single pipe up to the super charger

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Dirtman » Sun Aug 13, 2017 5:23 pm

There is someone who works with Darin at Pacemaker ignitions who has been building electronic fuel injection systems for several 6 cylinder aircraft engines (both Lycoming and Continental) The people I have spoken to seem to be very satisfied with them. They have said they are very dependable and fuel economy has picked up considerably
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby GMAC 76 » Sun Aug 13, 2017 6:19 pm

well I sure think if he could build them for a 6cy he could build it for 8 cyl.....might be a hell of an idea there

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Re: IO-720 Lycoming Fuel Injection Alternatives

Postby Sjteuton » Sun Aug 13, 2017 7:30 pm

If it will get better fuel economy, I'm all for it. The sucker likes gas. I'll reach out to Darin tomorrow. Someone said they are really high priced, does anyone know what he is getting for a 6 cylinder system?


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