Today's Message Index:
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1. 07:04 AM - Hacman mixture control (crouton)
2. 08:46 AM - Bing mixture (crouton)
Message 1
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| Subject: | Hacman mixture control |
Re: Tubing. Anything suitable for undercowl or underhood conditions willbe suitable.
I used fuel line tubing I had on hand. Make sure the curves are long
and soft enough not to stress the fittings you are fitting to the carburetor.
The aquarium tubing supplied with my unit failed due to heat and friction.
Real fuel line is much more robust. Keep it flexible.
Carburetors mix fuel and air by volume and at 8000ft you have left 25% of the atmosphere
behind. Therefore a cubic meter of air at 8k ft contains only 75% of
the oxygen and the carb should be mixing 75% of the sea level fuel at WOT.
Temperature does affect the air density but altitude (atmospheric pressure) has
a much greater effect than 10 degrees C.
Fuel injection systems mix fuel and air by mass, not by volume, and are much less
affected by air density.
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Message 2
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The Bing meters fuel with the interaction of the needle and the main jet. At full
throttle the needle has been lifted clear of the jet. Jet size (bore) at
WOT determines fuel volume and is sized to flow a little extra at WOT providing
richer mixture for climb. Upon reaching cruise and reducing throttle the needle
decends part way into the jet bore, constricting the fuel delivery to cruise
rates (up to 4000ft). Higher than that the diaphragm needs a little help
to lower the needle in the jet. The Hacman changes the pressure (vacuum) on top
of the diaphragm thus lowering the needle and leaning the mixture.
Id be awfully cautious about messing with the 914 mixture as it is a turbo-normalized
engine.
Creighton
Sent from my iPad
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