Re: E10 Gas and Octane Rating


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Posted by Jeremy Horvath [108.162.237.151] on Wednesday, February 22, 2017 at 11:56:37 :

In Reply to: Re: E10 Gas and Idle mixture screws posted by Jeremy Horvath [108.162.237.151] on Wednesday, February 22, 2017 at 11:42:19 :

I used to work in anti-counterfeiting and fuels were our meat/potatoes. So I've learned a few things.

You can add ethanol to crappy gas (what passes for gas today, anyway) and up the octane rating to meet what's posted. After the ethanol pulls in a little moisture (not to phase separation yet) the ethanol burns even more slowly. The gasoline, it's still crap. So, because the ethanol/water is still mixed in, detonation isn't the main issue. But our idle quality suffers noticeably.

Unless you run a drag racer on E-85 here in Texas.

You see, in TX, they have to ship ethanol in. So, even though you're lucky enough to find a station that sells E-85, what you're getting is anything from E-0 to E-something. When you have to get the ~105 octane of E-85, you must (must!) measure what you purchased prior to putting it in the fuel cell.

The company that I once worked for was tasked with providing the E-85 for a science/research-related mileage contest. We shopped all across DFW and found that it was E-0 to E-34. We finally asked the fuel distributor to mix up some especially for the contest.



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