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Mixture Control on the Rotax 912ULS

 
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grantc(at)ca.inter.net
Guest
PostPosted: Mon Mar 27, 2006 9:05 pm    Post subject: Mixture Control on the Rotax 912ULS Reply with quote
FWIW,

I installed a mixture monitor gauge on my CAM100 just to make me 'feel
better' that the automatic mixture compensation in my autocarb was working.
It's interesting to see that at 5,000 rpm the mixture is running richer than
at 4900 -- I don't have enough data to prove anything yet, but from another
operator, I suspect that there is a significant fuel economy over a tank of
fuel, buy reducing to this setting and accepting 5mph less speed.

Also, any variance in this instrument should alert me to problems before
they lead to running out of gas or having a carb/engine failure.

Unhappily, the heavy lead content of AVGAS limits this sensor to auto gas
only.

--
Grant Corriveau
C-GHTF / HDS / CAM100
Quote:
From: Zenith-List Digest Server <zenith-list-digest(at)matronics.com>
Reply-To: zenith-list(at)matronics.com
Date: Sun, 19 Mar 2006 23:58:39 -0800
To: Zenith-List Digest List <zenith-list-digest(at)matronics.com>
Subject: Zenith-List Digest: 15 Msgs - 03/19/06

Time: 08:19:06 AM PST US
From: Leo Gates <leogates(at)allvantage.com>
Subject: Re: There is Mixture Control on the Rotax 912ULS



My 912UL (Uncertified) bought in 1997 has altitude compensating Bing carbs.

Leo Gates
N601Z


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craig(at)craigandjean.com
Guest
PostPosted: Mon Mar 27, 2006 10:05 pm    Post subject: Mixture Control on the Rotax 912ULS Reply with quote
Actually others are successfully using mixture sensors with leaded fuel.
Yes, it does shorten the life of the sensor but you are talking tens of
hours, not minutes. Plenty of time to characterize a new engine.

-- Craig

--

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mtherr(at)yahoo.com
Guest
PostPosted: Tue Mar 28, 2006 3:26 am    Post subject: Mixture Control on the Rotax 912ULS Reply with quote
Actually, this is normal and a good thing.

If I understand what I learned right, mixture needs to
be rich (about 12:1) at WOT (Wide Open Throttle) for
maximum HP. Then, at cruise speed, it can run leaner.

Michel
do not archive
--- Grant Corriveau <grantc(at)ca.inter.net> wrote:

Quote:

<grantc(at)ca.inter.net>

FWIW,

I installed a mixture monitor gauge on my CAM100
just to make me 'feel
better' that the automatic mixture compensation in
my autocarb was working.
It's interesting to see that at 5,000 rpm the
mixture is running richer than
at 4900 -- I don't have enough data to prove
anything yet, but from another
operator, I suspect that there is a significant fuel
economy over a tank of
fuel, buy reducing to this setting and accepting
5mph less speed.

Also, any variance in this instrument should alert
me to problems before
they lead to running out of gas or having a
carb/engine failure.

Unhappily, the heavy lead content of AVGAS limits
this sensor to auto gas
only.

--
Grant Corriveau
C-GHTF / HDS / CAM100
> From: Zenith-List Digest Server
<zenith-list-digest(at)matronics.com>
> Reply-To: zenith-list(at)matronics.com
> Date: Sun, 19 Mar 2006 23:58:39 -0800
> To: Zenith-List Digest List
<zenith-list-digest(at)matronics.com>
> Subject: Zenith-List Digest: 15 Msgs - 03/19/06
>
> Time: 08:19:06 AM PST US
> From: Leo Gates <leogates(at)allvantage.com>
> Subject: Re: There is Mixture
Control on the Rotax 912ULS
>
>
<leogates(at)allvantage.com>
>
> My 912UL (Uncertified) bought in 1997 has altitude
compensating Bing carbs.
>
> Leo Gates
> N601Z





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----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby

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