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alternative carb for 912

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Sun May 17, 2009 3:15 am Post subject: alternative carb for 912

Has anyone on this list every tried adapting a different carburetor (single) to the Rotax 912 series engine? If so, I'd like to hear anything/everything you've learned in the process?

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

m.tucciarone(at)hotmail.c
Guest

Posted: Sun May 17, 2009 4:09 am Post subject: alternative carb for 912

There was a guy, who is form California, who sells a fuel injection bolt on

for the 912 and 914 but it cost about $8,000. I was talking to him at Sun

and Fun. He uses some of the military stuff that comes off of the predator

drones. 



He says his 914 puts out 150hp.



Cool idea but if you bolt one of these things on you engine, forget about

any support from Rotax.





Has anyone on this list every tried adapting a different carburetor (single)

to the Rotax 912 series engine? If so, I'd like to hear anything/everything

you've learned in the process?



--------

Thom Riddle

Buffalo, NY

http://riddletr.googlepages.com/sportpilot-cfi

http://riddletr.googlepages.com/a%26pmechanix



A complex system that works is invariably found to have evolved from a

simple system that works.

  - John Gaule





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 44342#244342

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daveaustin2(at)primus.ca
Guest

Posted: Mon May 18, 2009 3:14 am Post subject: alternative carb for 912

Thom,

I couldn't help seeing the trailer item you put on your messages AFTER you 

had asked about a carb change!!!

Could I ask why you would want to change the carbs to something else?

Dave Austin  601HDS - 912

Just kidding..

do not archive

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon May 18, 2009 3:35 am Post subject: Re: alternative carb for 912

Dave,



I'm interested in adapting a single carburetor to the 912 with manual mixture control to replace the two expensive and complex Bing 64s. I'm just curious if anyone else has done this. I have no problems with the current set up and just finished cleaning, inspecting, replacing seals and synching both carbs at about 700 hours.



Rotax 912 engine is a great engine but the carb setup is overly complex.  I'm looking at the Aerocarb as a possibility. There are cheaper ones available but this one is about as simple as a carburetor can be. 

http://www.aeroconversions.com/products/aerocarb/index.html



I spent most of my career as a mechanical engineer doing machine design and keeping it simple has always proven to be a virtue, hence the quote in my signature line.

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon May 18, 2009 6:28 am Post subject: Re: alternative carb for 912

Hi Thom,



Typically you lose some HP going to a single carb. That's why so many 2 strokes and 4 strokes over the many years went to 2 carbs from the earlier days of ultralights. They wanted to get more HP out of their engine.

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Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon May 18, 2009 6:34 am Post subject: Re: alternative carb for 912

Roger,



"Typically you lose some HP going to a single carb." 



Not if it is sized correctly.

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

Gilles.Thesee(at)ac-greno
Guest

Posted: Mon May 18, 2009 7:47 am Post subject: alternative carb for 912

Thom Riddle a écrit :

 	  Quote: 	
		   I'm interested in adapting a single carburetor to the 912 with manual mixture control to replace the two expensive and complex Bing 64s. I'm just curious if anyone else has done this. I have no problems with the current set up and just finished cleaning, inspecting, replacing seals and synching both carbs at about 700 hours.



 Rotax 912 engine is a great engine but the carb setup is overly complex.  I'm looking at the Aerocarb as a possibility. There are cheaper ones available but this one is about as simple as a carburetor can be.

Thom,
	


Of course, the Aerocarb is simple, but like any other throttle body 

injector, it needs manual inputs (mixture) to perform what float or 

diaphragm carbs do automatically.

You just can't provide adequate mixture over the full slide range with a 

slide moving across a circular throat and just a needle. Also, those 

devices are very dependent on fuel delivery pressure. That's what float 

or diaphragm carbs were invented for.

If simplicity is key, then changing a system that works is best avoided. 

How many work hours for an adequate intake manifold and filter box 

design ? How many test hours to ensure correct working over the entire 

flight envelope ?  How much fiddling with needles, to end up with a one 

of a kind system that probably won't work in another airplane ?



 	  Quote: 	
		    

 http://www.aeroconversions.com/products/aerocarb/index.html



 I spent most of my career as a mechanical engineer doing machine design and keeping it simple has always proven to be a virtue, hence the quote in my signature line.

Nice quote indeed. Also "If it ain't broke, don't fix it".
	


Best regards,

-- 

Gilles

http://contrails.free.fr

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arno7452(at)bellsouth.net
Guest

Posted: Mon May 18, 2009 12:42 pm Post subject: alternative carb for 912

There are a bunch of NASCAR guys here in NC that know all about big carbs. 

You might have to cut a hole in top of your cowl but that might look 

awesome!



Good Luck,

Ken

---

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