Robert Reed
Joined: 22 Oct 2009
Posts: 331
Location: Dallas/Ft.Worth
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 Posted: Fri Aug 09, 2013 1:04 pm Post subject: How long does it take to build an throttle body airbox? |
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Owen,
I am using the Superior IOF-360 engine with the Aerosance (Continental) FADEC system. I understand that Lycoming has now come out with their own version of the FADEC but I don't have any details on it. I just happened to see it while reading another article.
The censors are on either side of the throttle body which ONLY controls the air flow and not the fuel flow. Fuel is directly injected into the engine with injectors that are electronically controlled on each injector. They use a magnetic coil system that triggers the fuel valve in the injector for a measured fuel flow. Almost everything having to do with the FADEC is totally redundant. There are two fuel pressure sensors, two intake manifold pressure and temperature sensors, two electrical systems, and too many wires to keep track of. As a result, I will end up with a dual electrical system including two batteries and two alternators. The electrical system is a version of Bob Nuckolls Z-14 Dual Battery / Dual Alternator modified for the FADEC.
Have a great day,
BOB
From: Owen Baker <bakerocb(at)cox.net>
To: kis-list(at)matronics.com; REED ROBERT <robertr237(at)att.net>
Sent: Friday, August 9, 2013 3:37 PM
Subject: Re: Re: How long does it take to build an throttle body airbox?
8/9/2013
Hello Robert Reed, You wrote: “..... the dual sensors for manifold pressure and temperature required for the FADEC system take up a large portion of the height.”
1) Lycoming has actually fielded engines with a FADEC (Full Authority Digital Engine Control) system? What engine models?
2) Why would not a FADEC system take advantage of / require fuel injection?
Thanks,
OC
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From: Robert Reed (robertr237(at)att.net)
Sent: Friday, August 09, 2013 12:06 AM
To: kis-list(at)matronics.com (kis-list(at)matronics.com)
Subject: Re: Re: How long does it take to build an throttle body airbox?
Scott,
The throttle body is just an air control unit which in my mind should be shorter but the dual sensors for manifold pressure and temperature required for the FADEC system take up a large portion of the height. The blue tape is covering the mounts for the censors in the photo. They also protrude out several inches from the throttle body not including the wiring. I looked at the filtered air box from Vans. Another builder on the field has one and I looked at the measurements and they would have required me to also cut the bottom out of the cowling. I might have been able to use the Vans scoop but it would have required almost as much surgery on the cowling. The main difference though is going to come down to cost. When I am done the total cost for the air box, scoop, and modifications will be about $75 vs several hundred for any other option. Cost in time should be about the same overall.
I did get the baffle kit from Vans and you are right, it was a great starting point and saved considerable time. I used it to create a pressure cowling shown in the photo. Used piano hinges to provide quick easy access. My concern living in Texas is getting maximum cooling to the engine which is why I am using a pressure cowling along with vents on the side of the cowling. I am still concerned about getting enough air through the engine with the use of 4 into 1 exhaust. I am a bit concerned the exhaust system will block the air from the rear of the cowling. I am hoping I will have enough air flow.
Bob
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