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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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 Posted: Wed May 17, 2006 4:05 am Post subject: MA-4 carbs |
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While I was gone on Vacation I saw a question about the MA-4-5 carb idle =
mixture setting, but was unable to respond do to receive only status.
In the August 2004 Light Plane Maintenance periodical, I found the =
following:
"Some MA-4 series carbs have something of a strange glitch in that you =
can attempt to richen the mixture with the screw, but a 25 RPM rise at =
altitude is all you'll get. Often these engines will have no rise at all =
at sea level. Not to worry. The MA-4 series will operate well despite =
the strange behavior, and problems are few.
No not, however, back the idle mixture knob out so far that =
holding-spring tension is lost. There have been reports of the valve =
falling out in flight."
To bad I did not see this before I lost mine on my first flight. Oh =
well. If you do loose the screw in flight, all is well till you land =
and the engine idles slower than in flight. When this happens you are =
calling for full rich, and the engine quits due to flooding.
The point is, for MA-4 series only, adjust the idle mixture screw till =
the engine idles well on the ground and forget trying to get a rise when =
shutting down. Mine has been trouble free for the last 300 hours. =
Sometimes I see a slight rise when shutting down, but it seems to be =
totally dependant on atmospheric pressure and temperature.
Steve Glasgow - Cappy
N123SG RV-8
Cappy's Toy
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_________________
Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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truflite(at)yahoo.com
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| Posted: Wed May 17, 2006 6:09 pm Post subject: MA-4 carbs |
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We had a club 172 quit on final due to the idle
mixture needle departing the aircraft. Fortunately,
the pilot was over the fence when he pulled the
throttle to idle. That is when it quit. His landing
was uneventful other than having to be pushed off the
runway.
Dave
--- Steve Glasgow <willfly(at)carolina.rr.com> wrote:
| Quote: |
<willfly(at)carolina.rr.com>
While I was gone on Vacation I saw a question about
the MA-4-5 carb idle =
mixture setting, but was unable to respond do to
receive only status.
In the August 2004 Light Plane Maintenance
periodical, I found the =
following:
"Some MA-4 series carbs have something of a strange
glitch in that you =
can attempt to richen the mixture with the screw,
but a 25 RPM rise at =
altitude is all you'll get. Often these engines will
have no rise at all =
at sea level. Not to worry. The MA-4 series will
operate well despite =
the strange behavior, and problems are few.
No not, however, back the idle mixture knob out so
far that =
holding-spring tension is lost. There have been
reports of the valve =
falling out in flight."
To bad I did not see this before I lost mine on my
first flight. Oh =
well. If you do loose the screw in flight, all is
well till you land =
and the engine idles slower than in flight. When
this happens you are =
calling for full rich, and the engine quits due to
flooding.
The point is, for MA-4 series only, adjust the idle
mixture screw till =
the engine idles well on the ground and forget
trying to get a rise when =
shutting down. Mine has been trouble free for the
last 300 hours. =
Sometimes I see a slight rise when shutting down,
but it seems to be =
totally dependant on atmospheric pressure and
temperature.
Steve Glasgow - Cappy
N123SG RV-8
Cappy's Toy
browse
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FAQ,
Admin.
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