SAE Fuel Specifications

[markocosic]

Are these specs correct?

SAE Fuel Specs (http://www.sae.org/students/fsae-fuelspecs.xls)

Or should the '18,283 BTU/lb' entry for E85 be underneath the Ultra 94 column?

Curerntly trying some fag-packet calcs as to max heat release rate from the two fuels/restrictors and the E85 fuel they're providing seems to have a BTU/lb about 40% higher than very other E85 spec I've seen!

Ultra-100 and E85 octane specs are broadly similar aren't they?

[markocosic]

Are these specs correct?

SAE Fuel Specs (http://www.sae.org/students/fsae-fuelspecs.xls)

Or should the '18,283 BTU/lb' entry for E85 be underneath the Ultra 94 column?

Curerntly trying some fag-packet calcs as to max heat release rate from the two fuels/restrictors and the E85 fuel they're providing seems to have a BTU/lb about 40% higher than very other E85 spec I've seen!

Ultra-100 and E85 octane specs are broadly similar aren't they?

[jonnycowboy]

yes you're correct,
the 18283 BTU/lb should be in the ultra 94 column and in the e85 column it should be in the area of 10800 BTU/lb

[absolutepressure]

I've heard that E85 fuel has an octane rating of about 101-105, depending on the source. GM claims it produces more power and torque than typical gasoline, but it is consumed at a much faster rate. For the Impala, it's a highway difference of ~19mpg with E85 and ~27mpg with 87 octane gas. Now my question is if it produces more power, why is it being consumed faster? With gas, the higher the octane, the better the fuel economy.

For anyone that was wondering, 1 bushel of corn produces 2.8 gallons of E85, and that number keeps rising each year. It is speculated that E85 could support 20% of our dependance without affecting our food supply. If we all switch to 'yotas, it could accomodate 40% of our needs.

[Jersey Tom]

E85 has a lower specific energy content than regular race gas (e.g. GT100). But, you run a WAY richer fuel/air ratio, which apparently more than makes up for it, on the order of +5% performance.