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h&jeuropa
Joined: 07 Nov 2006
Posts: 649
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 Posted: Sat Apr 17, 2010 8:53 am Post subject: 914 Fuel Flow |
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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
N241BW
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loboloda(at)execulink.com
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| Posted: Sat Apr 17, 2010 12:29 pm Post subject: 914 Fuel Flow |
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Hi Jim & Heather,
Seems more likely to be a problem with the fuel flow gauge.
When you fill up after a flight is the amount of fuel used consistent
with that shown by the meter ?
For what its worth my 912S seems to average 16-18 litres per hour at
5,000 RPM, this is consistent with the reading
on my cruzpro fuel gauge.
Regards,
Dave
On 17-Apr-10, at 12:53 PM, h&jeuropa wrote:
| Quote: |
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
N241BW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=294546#294546
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rparigoris
Joined: 24 Nov 2009
Posts: 802
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| Posted: Sat Apr 17, 2010 1:10 pm Post subject: 914 Fuel Flow |
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Hi Jim & HeatherAs mentioned verify gauge speaks truth. As far as reading spark plugs, it is far less accurate than measuring exhaust. That said mogas with no lead is even less accurate than with leaded 100LL. That said to best read spark plugs you need to use 100LL and cruise for a while, then get the motor stopped as soon as you can to read. Pulling power and running at different throttle setting, lower power setting and lower RPMs will change reading. Bing, Eastwood and others sell a carbon monoxide detectoror that would allow you check actual mixture. Depending on your serial number of 914 rotax either has a check they want you to make of carbon monoxide above 100%, or on any engine if you alter intake, like installing an intercooler they want it tested on all serial numbers.http://www.gunson.co.uk/item.aspx?item=1835+You can measure 1 cylinder at a time, run hose from EGT hole with a loop going to a low point where you can put a hole to allow water to drain then run into cockpit where you have instrument. Best verify 80% 100% and above 100% is rich enough, then you can make sure that at 75% cruise and less you are not excessive rich.I have mixture ratio numbers I will target at hangar if you or anyone else is interested.:Quick ratio chart here:http://www.gunson.co.uk/items/pdf/Products/G4125_Instructions.pdfRon Parigoris [quote][b]
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acrojim7534(at)YAHOO.COM
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| Posted: Sat Apr 17, 2010 1:34 pm Post subject: 914 Fuel Flow |
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Jim
I thank the fuel flow sender is not calibrated correctly... I run 5300 and 33 inches with fuel burn 5.5 GPH I have never seen a fuel burn 7.5 GPH on my engine..
Fill tank to filler neck, go fly one hour and refil tank. Use 5000 and 31 inches... you should then know actual fuel burn.. The EGT's you are showing are about right for that RPM and MP
Jim
N398JB
From: "h&jeuropa" <butcher43(at)att.net>
To: europa-list(at)matronics.com
Sent: Sat, April 17, 2010 12:53:30 PM
Subject: 914 Fuel Flow
--> Europa-List message posted by: "h&jeuropa" <butcher43(at)att.net (butcher43(at)att.net)>
Posted: Sat Apr 17, 2010 8:52 am Post subject: 914 Fuel Flow
--------------------------------------------------------------------------------
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
N241BW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=294546#294546
= - List Contribution Web Site -  
[quote][b]
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europaxs(at)gmail.com
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| Posted: Sat Apr 17, 2010 1:35 pm Post subject: 914 Fuel Flow |
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Hi,
We have a 914 with Airmaster prop, but no intercooler.
At 75% power 5000rpm and 31 in Hg, we get 5.6 GPH mogas burn. We call it
6.0 just to be on the safe side.
Our spark plugs are normally a little carbon black on the front and tan on
the back ones.
7.5 gph seems excessive and would think it's the flow meter not reporting
correctly.
Matt Carpenter
N138WJ
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paul.the.aviator(at)gmail
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| Posted: Sat Apr 17, 2010 3:25 pm Post subject: 914 Fuel Flow |
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Hi All,
I recorded some data about 5 years ago with my laptop connected to the Grand Rapids EIS. The data points I am very confident with are:
28" 5.51
30" 6.22
31" 6.5
I also recorded data for 1 ~ 2 minutes for:
24" 2.81
25" 3.24
34" 7.95
The raw data is a sample every second and the standard deviation for these data points was low, so its probably good data as well.
I seem to recall that is was MoGas and my fuel flow sensor calibration is very accurate.
Hope this helps, Paul
[quote][b]
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