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05-10-2009, 04:34 PM
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Join Date: Jan 2006
Posts: 106
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Fuel Burn: Auto vs. Aero
Probably a dumb question but why the difference in fuel consumption per hour between different engine types.
RV-9A, 1100 lbs, O-320 Lycoming, carbureted, 2300 RPM (fix pitch wood sensinitch prop) = 8 Gallons/hr (give or take).
VS.
1971 ? Ton Dodge Power Wagon Pick up, 4000 lbs, 318 cu. In. V-8, two barrel carburetor, 2300 RPM (14 miles/gallon and 60 miles/hr) = 4.3 Gallons/hr.
Similar engines running the same duration and RPM, yet the Auto engine burns half the fuel while pulling 4 times the load. Just curious and figured someone here could clue me in.
Thanks
doug
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05-10-2009, 04:39 PM
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Join Date: Oct 2005
Location: Savannah, GA
Posts: 1,849
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I don't want to state the obvious but the truck only goes 60 miles in one hour where the -9 will probably go 160 miles in an hour.
Truck 14 mpg where as the RV gets 20 mpg.
__________________
Todd
N110TD
RV-10 Vesta V8 LS2/BMA EFIS/One formerly flying at 3J1 Hobbs stopped at 150 hours
Savannah, GA and Ridgeland, SC
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05-10-2009, 04:41 PM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by dougknight
Probably a dumb question but why the difference in fuel consumption per hour between different engine types.
RV-9A, 1100 lbs, O-320 Lycoming, carbureted, 2300 RPM (fix pitch wood sensinitch prop) = 8 Gallons/hr (give or take).
VS.
1971 ? Ton Dodge Power Wagon Pick up, 4000 lbs, 318 cu. In. V-8, two barrel carburetor, 2300 RPM (14 miles/gallon and 60 miles/hr) = 4.3 Gallons/hr.
Similar engines running the same duration and RPM, yet the Auto engine burns half the fuel while pulling 4 times the load. Just curious and figured someone here could clue me in.
Thanks
doug
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It's horse power, Doug.
The V-8 is not producing near the power the 0320 is.
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RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
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05-10-2009, 04:41 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Dude, help the economy buy a new truck!
Dave has it right, I'm gonna guess the truck is running at 35% power?
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RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
Last edited by Geico266 : 05-10-2009 at 04:45 PM.
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05-10-2009, 04:53 PM
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Join Date: Oct 2005
Location: Savannah, GA
Posts: 1,849
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I would also like to add that you would be burning a lot more than 8 gallons an hour in the pickup truck if it was going(if it could) 160 mph. The biggest energy cost is Drag and drag is related to the velocity squared.
__________________
Todd
N110TD
RV-10 Vesta V8 LS2/BMA EFIS/One formerly flying at 3J1 Hobbs stopped at 150 hours
Savannah, GA and Ridgeland, SC
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05-10-2009, 04:57 PM
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Join Date: Jan 2006
Posts: 106
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TSwezey
Not talking about time vs distance, talking time vs fuel consumed while running @ same RPM.
Geico266.Dude, help the economy buy a new truck
Spent all my $ on the plane. ha ha!
I guess I still don't understand how the truck can pull 4 times the load on half the fuel @ 35% power
doug
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05-10-2009, 05:04 PM
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Join Date: Oct 2005
Location: Savannah, GA
Posts: 1,849
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You are not doing the same amount of work! RPMs don't mean a thing!
__________________
Todd
N110TD
RV-10 Vesta V8 LS2/BMA EFIS/One formerly flying at 3J1 Hobbs stopped at 150 hours
Savannah, GA and Ridgeland, SC
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05-10-2009, 05:26 PM
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Join Date: Jan 2006
Posts: 106
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OK, The drag thing helps as does the amount of work, I guess.
If both engines were taken out of their respective vehicles and placed on engine stands side by side and run at the same RPM with no load. Would they burn the same amout of fuel??
doug
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05-10-2009, 06:00 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-10-2009, 06:11 PM
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Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,587
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Compare power not RPM
First, it's a fact that a good airplane engine like a IO-320 can produce 1 hp per hour on 0.4 pounds of fuel. The truck, even with FI, doesn't accomplish that or at least no better.
Second, you are not looking at the power factors, just RPM. You need to look at MAP, too if you want to make a comparison. Your MAP at 60 mph will be about 12 inches, more or less, maybe even less. You need a vacuum gauge which is kinda like an MAP meter.
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H. Evan's RV-7A N17HH 240+ hours
"We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" net of PayPal cost for 2015, 2016, 2017 and 2018 (December).
This airplane is for sale: see website. my website
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