Today's Message Index:
----------------------
1. 04:14 AM - Re: alternative carb for 912 (Dave Austin)
2. 04:36 AM - Re: alternative carb for 912 (Thom Riddle)
3. 07:28 AM - Re: alternative carb for 912 (Roger Lee)
4. 07:34 AM - Re: alternative carb for 912 (Thom Riddle)
5. 08:47 AM - Re: Re: alternative carb for 912 (Gilles Thesee)
6. 01:42 PM - Re: Re: alternative carb for 912 (Ken Arnold)
Message 1
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| Subject: | Re: 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
Message 2
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| 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.
--------
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=244490#244490
Message 3
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| 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.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=244510#244510
Message 4
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| Subject: | Re: alternative carb for 912 |
Roger,
"Typically you lose some HP going to a single carb."
Not if it is sized correctly.
--------
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=244512#244512
Message 5
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| Subject: | Re: alternative carb for 912 |
Thom Riddle a crit :
> 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 ?
>
> 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
Message 6
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| Subject: | Re: 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
----- Original Message -----
From: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Sent: Monday, May 18, 2009 11:37 AM
Subject: Re: RotaxEngines-List: Re: alternative carb for 912
> <Gilles.Thesee@ac-grenoble.fr>
>
> Thom Riddle a crit :
>> 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 ?
>
>> 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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