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Randy.McFarland(at)novell
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 Posted: Mon Dec 31, 2007 4:03 pm Post subject: Need some reference material help |
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Anyone have the Precision MA4-5 manual in e form? I can't find it on
internet.
I don't get the 50 rpm drop when going to idle-cutoff, but don't know
which way to turn the screw to richen/lean it.
Thx
Randy
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bobbyhester(at)newwavecom
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| Posted: Mon Dec 31, 2007 4:27 pm Post subject: Need some reference material help |
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I don't get it either. I tried adjusting it a while back and never
could get it.
----
Surfing the web from Hopkinsville, KY
Visit my flying RV7A web page:
http://home.newwavecomm.net/bobbyhester/MyFlyingRV7A.htm
McFarland, Randy wrote:
| Quote: |
Anyone have the Precision MA4-5 manual in e form? I can't find it on
internet.
I don't get the 50 rpm drop when going to idle-cutoff, but don't know
which way to turn the screw to richen/lean it.
Thx
Randy
|
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rhdudley1(at)bellsouth.ne
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| Posted: Mon Dec 31, 2007 4:53 pm Post subject: Need some reference material help |
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Randy,
I have a Precision manual (paper) which I purchased in case I needed it.
Since I have not yet needed it, I have not really gotten familiar. I
have an O 320-D1A but have not matched up the carburetor with the
diagarams in the manual. It covers a number of carburetors including the
MA4-5. It seems that the MA4-5 comes in a variety of flavors and
additional detail is needed to select the correct one. Many pages
address the MA4-5 but with carburetor numbers like: A10-3634 or
A10-3391-1. There are a lot of them. With the right number, I could scan
the exploded view and parts list and e-mail them to you, if the would be
of use to you.
Let me know if that would help.
Richard Dudley
do not archive
McFarland, Randy wrote:
| Quote: |
Anyone have the Precision MA4-5 manual in e form? I can't find it on
internet.
I don't get the 50 rpm drop when going to idle-cutoff, but don't know
which way to turn the screw to richen/lean it.
Thx
Randy
|
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dale1rv6(at)comcast.net
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| Posted: Mon Dec 31, 2007 6:00 pm Post subject: Need some reference material help |
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Randy,
Legend says rise, not drop. More than one veteran IA told me not to worry if
I did not see that. Some sources stress testing at 650 rpm idle.
Dale
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kboatright1(at)comcast.ne
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| Posted: Mon Dec 31, 2007 6:23 pm Post subject: Need some reference material help |
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Just to clarify things...
With a carb, you should see a 25-50 rpm increase in rpm before the engine
dies as you lean it from idle.
To enrich the idle setting, turn the screw out (counterclockwise). To lean
the setting, turn it in (clockwise).
KB
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bicyclop(at)pacbell.net
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| Posted: Tue Jan 01, 2008 12:40 am Post subject: Need some reference material help |
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I believe that the idle screw only controls the mixture at idle. As soon
as you give it any throttle, the main jet kicks in and the idle circuit
is no longer working. It doesn't matter much in practice if you have the
right mixture at idle because you should be taxiing around with the
mixture so lean that it won't take much throttle without puking so that
you don't foul plugs. The so lean it pukes setting will keep you from
mistakenly taking off with a partially lean setting. It reminds you to
go full rich.
Pax,
Ed Holyoke
Kyle Boatright wrote:
[quote]
Just to clarify things...
With a carb, you should see a 25-50 rpm increase in rpm before the
engine dies as you lean it from idle.
To enrich the idle setting, turn the screw out (counterclockwise). To
lean the setting, turn it in (clockwise).
KB
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kboatright1(at)comcast.ne
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| Posted: Tue Jan 01, 2008 10:17 am Post subject: Need some reference material help |
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I'm 98% certain there are two screws - The mixture adjustment screw, which
is the one I wrote about and the idle adjustment, which you use to set idle
speed.
KB
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Jan 01, 2008 10:53 am Post subject: Need some reference material help |
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Not on a standard Precision/Marvel Schebler carb for a 4 cyl Lycoming,
there isn't a main mixture screw. There are more or less 4 fuel
circuits. The idle is adjusted with the needle valve. An off-idle slot
may or may not be incorporated to handle the transistion to low power
settings, the main jet, which feeds fuel from the bowl through it into
the venturi for almost all your fuel(and is a fixed orifice), and the
accelerator pump circuit that only squirts when the throttle is pushed
forward. There are several different part numbers that match the carb to
the specific engine model by what size main jet is installed.
KM
A&P/IA
Kyle Boatright wrote:
[quote]
I'm 98% certain there are two screws - The mixture adjustment screw,
which is the one I wrote about and the idle adjustment, which you use
to set idle speed.
KB
---
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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