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bo124rs(at)hotmail.com
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 Posted: Tue Jul 17, 2007 5:58 am Post subject: Idle set screw adjustment |
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It's getting close to the initial engine start. I have a MA4-5
Precision Marvel-Schebler carb. I want to check the setting on the
idle adjusting needle but can't find the factory recommended setting
of number of turns out. Anyone got that handy?
Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/blackwing1.jpg
http://rvflying.tripod.com
do not archive
_________________________________________________________________
Don't get caught with egg on your face. Play Chicktionary!
http://club.live.com/chicktionary.aspx?icid=chick_hotmailtextlink2
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pitts_pilot(at)bellsouth.
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| Posted: Tue Jul 17, 2007 8:11 am Post subject: Idle set screw adjustment |
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I never found anything either. I back the screw out 4 turns or so and
start there. If it won't run at idle (starts on prime and will run with
more prime) then back it out a couple more. If it smokes (black) then
it's too rich and you need to turn it in a couple. Once it runs smooth,
then look for a 50 to 100 RPM rise as you slowly move the mixture to
idle cutoff. You also need to get the idle RPM down around 700 for
starters.
The reason, I think, that ther's no info is that all carbs aren't
created equal .... at least in the idle circuit.
Linn
do not archive
Dana Overall wrote:
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bobbyhester(at)charter.ne
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| Posted: Tue Jul 17, 2007 6:11 pm Post subject: Idle set screw adjustment |
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Dana, I never could get the 50 to 100 RPM rise that everyone says you
should get.
Surfing the web with my laptop from Hopkinsville, KY
Visit my RV7A website: http://webpages.charter.net/bobbyhester/MyFlyingRV7A.htm
linn Walters wrote:
| Quote: |
I never found anything either. I back the screw out 4 turns or so and
start there. If it won't run at idle (starts on prime and will run
with more prime) then back it out a couple more. If it smokes (black)
then it's too rich and you need to turn it in a couple. Once it runs
smooth, then look for a 50 to 100 RPM rise as you slowly move the
mixture to idle cutoff. You also need to get the idle RPM down
around 700 for starters.
The reason, I think, that ther's no info is that all carbs aren't
created equal .... at least in the idle circuit.
Linn
do not archive
Dana Overall wrote:
>
> It's getting close to the initial engine start. I have a MA4-5
> Precision Marvel-Schebler carb. I want to check the setting on the
> idle adjusting needle but can't find the factory recommended setting
> of number of turns out. Anyone got that handy?
> Dana Overall
> Richmond, KY i39
> RV-7 slider, Imron black, "Black Magic"
> O 360 A1A, C/S C2YK-1BF/F7666A4
> http://rvflying.tripod.com/blackwing1.jpg
> http://rvflying.tripod.com
> do not archive
>
> _________________________________________________________________
> Don't get caught with egg on your face. Play Chicktionary!
> http://club.live.com/chicktionary.aspx?icid=chick_hotmailtextlink2
|
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pitts_pilot(at)bellsouth.
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| Posted: Tue Jul 17, 2007 6:41 pm Post subject: Idle set screw adjustment |
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Bobby Hester wrote:
| Quote: |
Dana, I never could get the 50 to 100 RPM rise that everyone says you
should get.
|
There are only two reasons not to get the rise .... either it's already
too lean or you're pulling the mixture too fast. I guess if it's too
rich then the rise may not be apparent as you go through the lean spot
prior to cutoff.
Linn
do not archive
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baremetl(at)gvtc.com
Guest
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| Posted: Tue Jul 17, 2007 9:06 pm Post subject: Idle set screw adjustment |
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I have never been able to observe the rise either, and I've pulled the
mixture back very slowly more than a few times looking for it. So maybe my
idle mixture is too lean to have the rise, but it's been this way for nearly
1400 hrs. with apparent ill effects.
Ivan Haecker -4 1377 hrs. S. Cen. TX
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