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Old 10-02-2012, 06:38 AM
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cgaengineer cgaengineer is offline
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Join Date: May 2007
Location: Winder, GA
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Quote:
Originally Posted by GMLC View Post
This has been talked about before. Yes ethanol has less BTU's than gas but has more energy density. Higher ethanol produces more HP. Below are the results from many studies done to prove this. Sorry its hard to read because the chart doesnt copy and paste just the text. Ethanol content is the second line down and HP is second from bottom. Results are listed in order from E10 up to E85.


Table 4. Heavy-Load (4.7 L Engine)
Fuel Ethanol Content 10% 20% 30% 85%
BTU content (BTU/gal) 111,070 107,140 103,210 81,595
% change in BTU’s per gallon 0% -3.5% -7.1% -26.5%
65 mph
Hp 50.8 52.1 52.0 54.4
Gph 5.96 6.08 6.27 6.93
Mpg 10.7 10.5 10.3 9.3
BTU’s per mile 10,347 10,237 10,016 8,744
Gallons per hp hr 0.117 0.117 0.120 0.127
BTU per hp hr 13,035 12,514 12,431 10,393
Fuel Trim % -2.6% -1.0% -1.4% -0.6%
Injector Pulse Width (ms) 8.5 8.6 9.1 11.6
% change in pulse width 0% 0% 7% 36%
50 mph
Hp 34.5 33.0 40.4 33.3
Gph 3.81 3.91 4.01 4.51
Mpg 13.1 12.8 13.1 11.1
BTU’s per mile 8,459 8,348 7,908 7,338
Gallons per hp hr 0.110 0.118 0.099 0.135
BTU per hp hr 12,271 12,678 10,253 11,043
Test Cycle
Mpg 12.7 12.4 12.2 10.9
% change in mpg 0% -2% -4% -14%
BTU’s per mile 8,738 8,348 7,908 7,338
% change in BTU’s per mile 0% -1% -3% -14%
Cost per mile $0.193 $0.196 $0.198 $0.183
% change in cost per mile 0% 1.6% 2.6% -5.2%
Other
Max hp (2nd gear) 195 197 198 202
Max torque (2nd gear) 235 241 240 247
This is an engine designed to run on either fuel and would naturally have ways to ret@ard timing when using straight gas to prevent preignition. Engine is tuned to generally run e85.
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