CheechDogg.0n37s
Banned
- Joined
- Nov 20, 2018
- Posts
- 0
- Reaction score
- 63
- Location
- Riverside California
- Ram Year
- 2018 2wd
- Engine
- HEMI 5.7 Revolution 4.88s
I am not a gas/fuel chemist, mad scientist, "Breaking Bad" type of guy, but I am only going by what these articles and people who own gas companies that I know do ...Not sure why adding 113 octane ethanol to 110 octane non-ethanol alkylated gasoline yields an 87 octane blend. Pretty clear that ethanol was used as a cheap, taxpayer-subsidized octane booster that also reduces fuel economy due to less thermal energy per unit volume.
Higher octane fuel only performs better in engines that have high enough cylinder pressure to burn it. Whether be by compression ratio, turbocharger, supercharger, intercooler, or other means. Otherwise, a higher octane fuel without enough spark advance does not burn completely - producing more engine deposits.
Low octane pure gasoline is especially important for small gasoline engines with low compression ratios, such as Briggs & Stratton's (6:1 compression ratio, flathead, extremely sensitive to incomplete combustion buildup).
I worked for a major engine manufacturer, Onan. Also used Ford & GM Industrial engines. Then Cummins for diesels.
Like I said, my friend in Georgia, her and her husband run gas companies and they bought 110 octane fuel, mixed it themselves and go the 87, 89 and 91 that the sold without having to actually buy the blended octanes already from the refineries ...
I think this is what's confusing right?
When you mix 10 percent 113 octane ethanol with 85 octane gasoline it increases the octane two points to the normal 87 octane most consumers use
I take or understand from that above that if you mix 113 octane gasoline with 10% ethanol with 85 octane you get the 87 which is the normal octane mos use ... that is how gas stations sell 87, 89 and 91 as they like .....
I have seen how some people on these forums are leery about certain gas stations selling 87 as 91 or 89 as 91 .... this is how they do it ... all that gas is actually raw 110+ octane to start off with, but adding that ethanol and what ever else they add drops it down to the 87 ... right?
I might be completely misunderstanding all this lol ..but that's how my brain is understanding this mumbo jumbo lol ....