Today's Message Index:
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1. 06:25 AM - Happy First Flight Day (Richard Girard)
2. 07:01 AM - Re: Rough Running 912 (lucien)
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| Subject: | Happy First Flight Day |
Wilbur Wright invented flight controls, with Orville invented aircraft
propeller theory, and developed the first real flight test program. Until
1908 all the others were just jumping off the roof with an umbrella. Happy
First Flight Day folks.
Rick Girard
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 2
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| Subject: | Re: Rough Running 912 |
Thom Riddle wrote:
> Hugh,
> We ran our Allegro with vent lines tucked into the float-bowl bail too for the
entire time we owned it, with no problems either. It is not essential to change
that in any way as long as you don't have any really odd airflow under the
cowl and therefore unusual pressure distributions. However, routing the vent
line to the inside of the air filter is the way that Jabiru does theirs and it
does eliminate any spurious pressure issues that might arise in some installations.
>
> As Lucien said, black plugs are common after a few minutes of low rpm running.
The only way to get an accurate plug reading on engines with Bing CV carbs is
to cut the engine off at altitude at cruise rpm, do a dead stick landing and
check the plugs. I am not recommending this, of course, though I have done it
myself.
BTW, another way that I mentioned before that you can do without pulling the plugs
is just examining your exhaust baffles. What I've found is the high-power
mixture will be reflected in a baffle, but a rough gauge of what you're getting
at low power settings will collect on inside of the exhaust outlet.
I.e. the exhaust pipe will usually have a fair buildup of black soot but the exhaust
baffle will hopefully be a light antique white.
When I was doing my carb sync after getting my rebuilt carbs back a few months
ago, I did a lot of running at idle and 2000 to 3000 on the ground. The baffle
inside my exhaust got pretty tarred&feathered with soot. but after going up and
doing a few touch and goes the baffles were nice and white when I got back
down.
The other discovery is that when I finally got the idle mix set on the "knee",
the idle EGT's ended up around 1050 to 1100F. I was at about 800 to 900F before,
which I didn't know was just slobbering rich.... The idle speed also came up
about 50 rpm as I leaned out the mix.
Course this is all at my 7000' MSL and the density altitude is usually 8000' or
more, so you kind of have to make adjustments like this up here.
At sea level, you're pretty much just bolt the motor on and don't screw with it....
Oh PS: the fight I started on the Kolb list wasn't about the 912 vent lines (it
was about the 2-stroke pulse line length).
LS
--------
LS
Titan II SS
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http://forums.matronics.com/viewtopic.php?p=323650#323650
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