Marvel Schebler │ Solid Epoxy Carburetor Floats Aircraft Engines
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Marvel Schebler │ Solid Epoxy Carburetor Floats Aircraft Engines

November 18, 2019


If you knew a way to make flying your plane
safer and more reliable wouldn’t you do it? Now there is a 21st century solution that
addresses problems for carburetor floats. Early carburetors had solid cork floats. Solid
cork wouldn’t leak but it would absorb fuel and then became too heavy to work right. Hollow brass floats followed around the time
of World War I. Their egg-shell-thin half-pontoons were soldered together. Then the pontoons
were soldered to brass frames. They wouldn’t absorb fuel, but the soldered seams were not
always dependable and often leaked. About half of the FAA Service Difficulty Reports
on carburetors concern float malfunctions. For example: “THE ENGINE FAILED TO RUN MORE
THAN ONE MINUTE…. THE LEFT PONTOON WAS FOUND LOOSE IN THE CARBURETOR BOWL” And here: “A PIN HOLE PERMITTED FUEL TO SEEP
INTO THE FLOAT…… CAUSING AN EMERGENCY LANDING”. Leaking and failing are caused by the difficulties
encountered in hand soldering the seams in brass floats. In this hot submergence test, bubbles can
be seen coming out of a defective float. If air can get OUT… fuel can get IN, and
if fuel gets IN, the float will sink. In 2005 the Marvel-Schebler solid epoxy float
was invented. It won’t leak, the epoxy won’t absorb fuel, and, there are no soldered joints,
so it won’t fall apart. Major engine manufactures, Lycoming and Continental
quickly specified the solid float for use in all Marvel Schebler MSA and HA type aviation
carburetors. A hole in an epoxy float makes no difference.
Here’s one being drilled, then floated. Even this float with multiple holes floats reliably. Here’s a hollow float with a hole through
it… which readily sinks. Epoxy floats are strong, reliable and tough. As you can see the brass float does not fare
well. Here’s an epoxy float coming out of a minus
50 degree cold chamber. It’s so cold that if you hit it you’d expect
it to shatter. Here, a brass float and an epoxy float were
heated in an oven. The brass float fell apart, while the epoxy float remains intact. In harsh environment tests, epoxy floats were
immersed in carburetor stripper for days without damage, even though some had been cut open
to expose their interiors. Many thousands of solid epoxy floats have
gone into service in overhauled and new production OEM carburetors. None have leaked…
fallen apart… or absorbed fuel.
These advantages effectively render hollow brass floats obsolete for aviation use. No matter who makes hollow floats… or even
what they’re made of, the problem is that hollow floats are, well… they’re hollow.
And hollow things can sink… whether or not they are PMA approved. Marvel-Schebler solid epoxy floats can’t leak
and won’t sink… and soldered joints that don’t exist, can’t fail. Marvel-Schebler is the original equipment
carburetor manufacturer that has supplied genuine OEM carburetors for over 70 years
to Teledyne Continental Motors, Lycoming Engines, Franklin Engines, Engine Components, Superior
Engines, Cessna Aircraft, and Robinson Helicopters. Taking chances is never a good idea when lives
are on the line. Choose the 21st century solution; the Solid Epoxy Carburetor Float by Marvel-Schebler.

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  1. Are these epoxy floats secure against today's MOGAS with the various additives involved? Asking for my Continental O-200 with a MS carb.

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