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02-05-2011, 12:19 PM
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Join Date: Jan 2011
Location: Grass Valley, Ca
Posts: 2
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Fuel Flow, Superior IO-360 9.1 ratio
We built an RV8A with the Superior IO-360 engine with 9.1 comp ratio, approx 195 HP at 2700 RPM. We are showing about 14.5 GPH on takeoff, full MP & full RPM during the initial takeoff. Should we not be showing more like 16 GPH?
Last edited by gbennett842BB : 02-05-2011 at 12:22 PM.
Reason: re-write
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02-05-2011, 12:47 PM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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what kind of exhaust temps are you seeing?
You might have to adjust your K factor on the fuel flow. Although, it is usually not that far off. On my IO-360 standard pistons, ~185 hp, I am seeing simillar fuel flows. Fixed pitch or constant speed?
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Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
Last edited by AltonD : 02-05-2011 at 01:57 PM.
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02-05-2011, 01:39 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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I see about 17.5-18 gph, If I recall correctly about .1 gph/hp is the norm.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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02-05-2011, 08:29 PM
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Join Date: Dec 2006
Location: Arroyo Grande, CA
Posts: 938
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At an SFC of 0.5, and 100LL weighing 5.9 lb/gal, the fuel burn should be about 0.0847 gph/HP or 16.5 gph at 195 HP.
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02-06-2011, 01:13 AM
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Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,187
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At sea level you might see 16.5 or even more, but at Grass Valley you are at a higher altitude = less MP = less power = less fuel burn on take off at full throttle. Check it out when you go to the bay area. Larry
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