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Bill,
I didn't know that!
George ( down under)
----- Original Message -----
Sent: Tuesday, July 14, 2009 3:01
AM
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”
{:>)?
Ed
Ed
Anderson
Rv-6A N494BW Rotary
Powered
Matthews,
NC
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
>
>
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