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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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 Posted: Sat Apr 17, 2010 8:52 am Post subject: 914 Fuel Flow |
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We are finally starting to fly cross country and use cruise power settings. We have a 914 with intercooler and Airmaster constant speed prop in our Europa. When using 75% power per section 10.1.1.1 (5000 rpm 31 in Hg) we see fuel flow of 7.5 gph. Our EGTs are about 1450. The spark plugs have a nice tan color to them. The fuel consumption graph (fig. 11) suggests fuel flow should be about 5.5 gph.
If we throttle back to 5000 rpm, 29 in Hg, fuel flow drops to 6 gph. Not sure where this setting puts us on the consumption graph!
What fuel flow do others see? What power settings do others use?
Is our mixture too rich and is that adjusted by changing the position of the needles in the carbs? Dean at Lockwood said don't change anything, mostly because the plug colors are correct.
Thanks
Jim & Heather
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mikenjulie.parkin(at)btin
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| Posted: Sat Apr 17, 2010 10:04 am Post subject: 914 Fuel Flow |
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Hi Jim & Heather,
My Europa 914/Airmaster (monowheel) seems pretty close to the 5.5 gph in the
cruise. I normally cruise on fuel flow (generally 19 litres/hr) which gives
about 130 knots indicated, a little faster when lightweight. 7.5 gph equates
to 28 litres/hour which seems very high. Perhaps your fuel flow instrument
needs calibrating. Measuring actual fuel usage over time may help.
Regards,
Mike
Do not archive
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m.grass(at)comcast.net
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| Posted: Sat Apr 17, 2010 1:34 pm Post subject: 914 Fuel Flow |
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Jim, Heather,
Might a silly question but worthwhile to check. Did you check the return
fuel flow meter that it is indeed working and the setup in your display unit
to display the differential value?
Just a thought.
Michael Grass
A266
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Gilles.Thesee(at)ac-greno
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| Posted: Sat Apr 17, 2010 6:20 pm Post subject: 914 Fuel Flow |
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h&jeuropa a écrit :
| Quote: | What fuel flow do others see? What power settings do others use?
Our fuel flow reads 21-22 L/h at 75 % (31/5000) and about 33-34 l/h at
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115 % (39.9/5800) at takeoff.
| Quote: | Is our mixture too rich and is that adjusted by changing the position of the needles in the carbs? Dean at Lockwood said don't change anything, mostly because the plug colors are correct.
Check the instrument : feed and return turbines, K-factor, etc.
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Best regards,
--
Gilles
http://contrails.free.fr
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AmphibFlyer
Joined: 29 Dec 2009
Posts: 25
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| Posted: Sun Apr 18, 2010 6:11 am Post subject: Re: 914 Fuel Flow |
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| h&jeuropa wrote: | | ...We have a 914 with intercooler and Airmaster constant speed prop in our Europa. When using 75% power per section 10.1.1.1 (5000 rpm 31 in Hg) we see fuel flow of 7.5 gph... If we throttle back to 5000 rpm, 29 in Hg, fuel flow drops to 6 gph... What fuel flow do others see? What power settings do others use? ...Jim & Heather |
Jim & Heather, I generally cruise at about 4800 to 5000 rpm and 29 or 30 inches in my relatively draggy SeaRey. I plan for 5 gph and have never exceeded that amount in almost 900 hours. It burns a lot more during takeoff, but I've never tried to measure the consumption then--don't have a fuel flow meter installed.
=Don
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