Quote:
Originally Posted by Ladogaboy
@ drmiller100: Not to be a bother, but can you cite any sources for that? Everything I've read puts E85's stoich at just under 10:1. I understand running 7-8:1 for power, as that is the same concept as running rich with gasoline (usually 10-11:1) for power. But in terms of stoich, I thought that complete burn off is complete burn off. So rather than the 14.7:1 for gas, E85 has ~9.7:1. I know that you can obtain better economy by going beyond stoich, but everything I've read (this is in terms of gasoline) states that leaning out any further than 1.2 lambda doesn't do a whole lot.
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first, ethanol is lighter then gasoline, and injectors inject via volume, and stoich is normally measured by mass.
so if you squirt pure ethanol vs gasoline with an injector, you will find mileage is off about 20 percent, or, another way to put it, you need to squirt about 20 percent more ethanol then gasoline to make an engine run happy.
if it were truly 10:1 vs 14:1, your numbers would be 40 percent different.
my numbers are based upon personal experience with about 50 cars and LOTS of other people who have really tried it.