Ah! Bowl upside down to do the check – so float
is at top of its range meaning fuel is cut off. I understand – thanks, sorry
for the ignorance ‘bout carburetors. I personally think reference to the fuel
level rather than the float is less confusing – but all in what you standardize
on {:>). Yes, I can imagine the bitching – everyone hates it when a
accepted standard is changed. Whether its for the better or not {:>)
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of wrjjrs@aol.com
Sent: Monday, July 13, 2009 1:01
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Oly's
report on accident
Ok Ed,
Let's do a quick carb-speak check. FLOAT level typically is checked with the
carb upside down and the bowl removed. The number is the measured distance from
the gasket surface to the highest point on the float unless depicted otherwise
in the manual. Remember the FLOAT level is measured with the carb inverted, and
the thing to remember is that the higher the FLOAT level the lower the
FUEL level. The confusion with the reversed levels is the reason that all the
motorcycle manufacturers went to FUEL level only in their specifications. The
motorcycle guys gave you a tube which was a simple graduated cylinder, a hose,
and a tap screw to put in the bottom of the float bowl. You were supposed to
only measure the fuel level. In fact if you look at later model carburetors you
will see that the flange that contains the float bowl is cut away in the center
so you can see the gasket mating surface. The purpose of the cutaway was to
allow you to see the gasket seal surface to measure the fuel level, which used
the same reference surface. If you look in the service manual (Kawasaki
at least) of a bike with carbs printed in the last 15 years you will see only a
fuel level listed. Boy did that cause the mechanics to bitch when they first
made the change! When speaking only of the fuel level the understanding is
easy. Fuel level high, carb runs rich. Fuel level low, carb runs lean.
Sorry for the long explaination for the very simple concept.
Bill Jepson
-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Mon, Jul 13, 2009 9:30 am
Subject: [FlyRotary] Re: Oly's report on accident
Ok, Bill – you lost me. Must admit
my carburetor knowledge is a bit on the skimpy side.
However, in the carburetors I recall –
when the float level was high in the bow that meant there was lots of fuel in
the bowl, when the float level was low in the bowl the fuel was also. Am
I confused or did you “misspeak” {:>)?
Rv-6A N494BW Rotary
Powered
Finn,
Running Carburetors if the float level is too high, and therefore the fuel
level too low, it can prevent the vacuum from raising the fuel enough to keep
the engine running. This is less common than the FUEL level being too HIGH
which will cause the engine to go rich when the throttle is closed. I see the
rich condition far more often.
Bill Jepson
-----Original Message-----
From: Finn Lassen <finn.lassen@verizon.net>
To: Rotary motors in air craft <flyrotary@lancaironline.net>
Sent: Sat, Jul 11, 2009 4:24 pm
Subject: [FlyRotary] Re: Oly's report on accident
Too
high? Now that's a new one. Please explain.
Finn
Al Gietzen wrote:
> I sometimes would have the engine quit > after pulling back on the
power while crossing midfield coming in a full > speed from the beach to
land at Clearwater
airpark
> -------------------------
> Did you ever check the carburetor float levels? Engine dying after
pulling
> the power is a symptom of too high a float level.
>
> Just a thought,
>
> Al
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.169 / Virus Database: 270.13.2/2214 - Release Date: 7/2/2009
5:54 AM < br> >
>
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html