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Europa-List: Setting the mixture - 914 Rotax

Subject: Europa-List: Setting the mixture - 914 Rotax
From: Paul McAllister <paul.mcallister@qia.net>
Date: Tue, 29 Jun 2004 22:16:30

Hi all,

I was wondering how the correct air / fuel ratio is set for a 914.  I
suspect that mine is running a bit rich.  I see black soot on the cowling
and on the under side of the wing. I think that the fuel flows are on the
high side. I am seeing the following numbers.

- 4500' @ 30' x 5000 rpm =  6.2 US Gallons per hour.
- 4500' @ 28' x 5000 rpm = 5.5 US Gallons per hour
- 4500' @ 26' x 5000 rpm = 4.5 US Gallons per hour

I am also suspicious that it uses more fuel at the same power settings at
higher altitudes.  I will connect my laptop to my EIS latter this week and
collect a larger data set to verify my measurements.

I'd appreciate anyone's opinion as to what I am seeing so far.

Thanks,  Paul




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