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pwmac(at)sisna.com
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 Posted: Wed Aug 27, 2008 6:11 am Post subject: Alky blend and power |
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Thom,
Great theory, and I do not challenge what you
wrote. In real life the dyno tests show the alky
blend has more power and increased gallons of
fuel consumed. The testing was for auto engines
designed for gasoline. I agree that at low
mixtures the result is hardly detectable.
If you want to know the reasons you need to dig
harder to explain why the theory does not work
out. I believe the test results and do not need more info.
Paul
============
At 05:45 AM 8/27/2008, you wrote:
| Quote: |
Gasoline contains approximately 116,000 BTU of energy per US Gallon.
Ethanol contains approximately 76,000 BTU of energy per US Gallon.
A blend of 8% ethanol with 92% gasoline would
result in a fuel that contains approximately
112,800 BTU per US Gallon, which is about 2.8%
less energy content than pure gasoline, which
means one could expect about 2.8% less power
available with this blend compared to gasoline without the ethanol.
Ethanol increases octane but does NOT add power,
it reduces power available from the fuel. Power
and Octane are unrelated as long as the octane
of the fuel is adequate to prevent detonation.
If the engine is designed to take advantage of a
higher octane (higher compression, different cam
and ignition timing, perhaps) then it might not
suffer a loss of power with the ethanol laced
gasoline. Otherwise, some power loss from
addition of ethanol is a given. You may not be
able to notice a 2.8% drop in power but a dynamometer will.
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N221FA Allegro 2000 912UL
N197BG FS1/447
--------------------
“Scratch any cynic,” he said, “and
you’ll find a disappointed idealist.”
George Carlin
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Wed Aug 27, 2008 7:27 am Post subject: Re: Alky blend and power |
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Paul,
Are you saying that the fuel with less energy content produces more power in engines designed for pure gasoline and not modified to take advantage of the higher octane due to the ethanol addition?
This exceeds my imaginative abilities so please point me to the study(ies) that demonstrate this. I'm easily convinced if scientific studies prove this. Otherwise I have to fall back on logic.
I'm not trying to start an argument, just trying to learn about this counterintuitive phenomenon.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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ronlee
Joined: 25 Dec 2006
Posts: 141
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| Posted: Wed Sep 03, 2008 7:06 am Post subject: Re: Alky blend and power |
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On a carburetor engine burning an alcohol mix fuel in an engine jetted for straight gasoline the power will drop. On a fuel injected engine with an oxygen sensor the volume of the fuel will automatically be increased until the proper amount of fuel, BTU is being fed to the engine, not so with a carburetor version, as the fuel flow is controlled by carburetor jets. If you burn a high volume of alcohol with a carburetor engine it will be running very lean unless the carburetor was re jetted to larger size jets to feed the proper amount of fuel (BTU)to the engine in relation to the volume of air used.
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Ron Lee
Tucson, Arizona |
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