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01-07-2010, 11:53 AM
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Join Date: Jan 2007
Location: Ontario Canada
Posts: 1,452
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Lycoming FI info/videos??
A few of us spent time today trying to really understand the silverhawk type system as it sits on my plane. It appears to us that the throttle body works like a carb with fuel jets and ram air, up and through the induction tubes..it does have a venture...so we dont understand why it cant get any iceing. Then fuel is also routed up to the spider with more fuel dumped into the engine through that system too.
Does anyone have a link or video that would help us see or understand this? Figured there must be something out there in cyberland that clarifies it all in a non gearhead manner. Thanks for any input.
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Rick Woodall C-GSTT "ghost"
9a -TMX io-320, catto three blade, dual dynon hdx with a/p. 900+ hrs in 8 yrs flying. 
Flew to Osh 11,12,15,17,19. SNF 2013. West to Cali /Washington/Vancouver/crossed the Rockies north to Red Deer east to Moosonee and over to maritimes. South to Jekyll Isl, cedar key, and Key West etc. 6 trips and 17 islands of the Bahamas. Flown turtles and dogs for Pilots n Paws too. Love our Rv's 
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01-07-2010, 12:28 PM
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Join Date: Jul 2009
Location: Longmont, CO
Posts: 236
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The experts here can answer this better than I, but just having been through working out a bug in my SilverHawk EX, I can give this simple answer:
No fuel is injected at the throttle body, it is routed through the SS lines/separate injectors screwed into the cylinder heads. The throttle body measures the airflow and meters the fuel to the injectors. If you're getting fuel into the airstream at the throttle body something is broken.
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01-07-2010, 12:29 PM
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Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
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Those are not fuel jets.. I don't think that your understanding of the system is correct... I thought I saw a "manual" for RSA-5 somewhere that explains how it works.. Of course, I have a hard-copy that Don at Airflow included, but don't have an electronic copy  Try searching on the 'net.. I'm sure you'll be able to find it.. Not sure if a video exists..
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Radomir
RV-7A sold
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01-07-2010, 12:35 PM
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Join Date: Jan 2007
Location: Ontario Canada
Posts: 1,452
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Ya...
When we look up into the silverhawk, there are 4 small jets...(they sure look like fuel jets??) then a big butterfly valve up inside past the jets...it really looks like the old carb type set ups in cars..but what do we know.
Obviously it work...just like to know how and why.
I have some visitors today, there is a past plane builder and sport bike racer here with lots of engine smarts and neither can tell me how it works either. Hmmm.
Just wondered as I enjoy learning all this stuff as I go....thanks.
__________________
Rick Woodall C-GSTT "ghost"
9a -TMX io-320, catto three blade, dual dynon hdx with a/p. 900+ hrs in 8 yrs flying.
Flew to Osh 11,12,15,17,19. SNF 2013. West to Cali /Washington/Vancouver/crossed the Rockies north to Red Deer east to Moosonee and over to maritimes. South to Jekyll Isl, cedar key, and Key West etc. 6 trips and 17 islands of the Bahamas. Flown turtles and dogs for Pilots n Paws too. Love our Rv's
Last edited by RickWoodall : 01-07-2010 at 12:50 PM.
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01-07-2010, 12:48 PM
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Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
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Radomir
RV-7A sold
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01-07-2010, 01:18 PM
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Join Date: Jul 2009
Location: Longmont, CO
Posts: 236
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Quote:
Originally Posted by RickWoodall
When we look up into the silverhawk, there are 4 small jets...(they sure look like fuel jets??) then a big butterfly valve up inside past the jets...it really looks like the old carb type set ups in cars..but what do we know.
Obviously it work...just like to know how and why.
I have some visitors today, there is a past plane builder and sport bike racer here with lots of engine smarts and neither can tell me how it works either. Hmmm.
Just wondered as I enjoy learning all this stuff as I go....thanks.
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Those tubes measure the airflow due to ram pressure of the incoming air. They aren't jets... |
01-07-2010, 04:48 PM
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Join Date: Jun 2006
Posts: 316
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FI 101
If Precision can't tell you how their system works, WE CAN 
Our next Fuel Injection 101 Class is the first weekend in March. There's still seats available.
Don |
01-07-2010, 05:15 PM
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Join Date: Dec 2006
Location: Winston-Salem, NC
Posts: 317
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Quote:
Originally Posted by Don at Airflow
Our next Fuel Injection 101 Class is the first weekend in March. There's still seats available. Don
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It's a great class. I highly recommend it!
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Bill Settle
RV-8 N38CW (Reserved)
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01-07-2010, 06:04 PM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by Don at Airflow
If Precision can't tell you how their system works, WE CAN
Our next Fuel Injection 101 Class is the first weekend in March. There's still seats available.
Don |
I enjoyed the November class so much, I'd like to do it again.
Don knows FI forward and backward, it doesn't matter what your system, you won't regret doing it.
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RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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