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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Mon Apr 13, 2009 10:07 am Post subject: Inverted Carbs, was: Great Oil Debate |
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At 07:00 AM 4/13/2009, you wrote:
| Quote: | Will the Bing carbs work in negative G?
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Noel,
I don't think any float bowl system will work in 0 or
negative G. They rely on submersion of the main jet plus open bowl
vents to allow a pressure differential between the venturi and the
bowl. (That's what moves the gas into the venturi.) There are "pumper
carbs" for the 2-strokers that will work in any attitude. These could
probably be modified for the 912, if one didn't want to go to fuel
injection. You might also be able to get an Ellison carb to work on the 912.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 300 hrs. and counting
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Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Mon Apr 13, 2009 11:51 am Post subject: Re: Inverted Carbs, was: Great Oil Debate |
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Guy, 912 not a great neg G engine. Stock Oil system is the issue.
This is why not many convert the Rans S 9 $ S10 to 912s. But stick with a 582 or put in a 670.
http://rotaxaircraft.com/forum/viewtopic.php?f=16&t=63
Lot of power and will work flawless at any atttittude with pumper carbs and neg Gs. Outside loop would kill a 912 quickly. Check the videos http://rotaxaircraft.com/forum/viewtopic.php?f=3&t=29
Most 2 strokes work well with pumper carbs but you should pre mix.
Your oil injection will get air in unless you got a flop tube type of oil injection bottle. Really would be easier to just stay with Pre Mix.
| Guy Buchanan wrote: | At 07:00 AM 4/13/2009, you wrote:
| Quote: | Will the Bing carbs work in negative G?
|
Noel,
I don't think any float bowl system will work in 0 or
negative G. They rely on submersion of the main jet plus open bowl
vents to allow a pressure differential between the venturi and the
bowl. (That's what moves the gas into the venturi.) There are "pumper
carbs" for the 2-strokers that will work in any attitude. These could
probably be modified for the 912, if one didn't want to go to fuel
injection. You might also be able to get an Ellison carb to work on the 912.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 300 hrs. and counting |
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Boilermaker2000
Joined: 14 Apr 2009
Posts: 11
Location: West Lafayette, IN
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| Posted: Tue Apr 14, 2009 3:41 pm Post subject: Re: Inverted Carbs, was: Great Oil Debate |
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How about fuel injection like the 600 E-TEC! I'm totally in love with this engine. Do you think that we could see some "homebuilders" modifying snowmobile engines for aircraft again? Or, do you think BPM has had enough success with the aircraft engines that they would be looking into releasing a 2-Stroke E-TEC UL engine? That would be awesome!
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