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  1. #11
    Quote Originally Posted by Astrofizix View Post
    Interesting, I would have thought the difference in those two blends would have been more than enough to show up when pushing boost / ignition timing to knock thresholds. I am lucky that I live in a hot climate so there is no need for blending below 85% Ethanol. In fact straight alcohol would really be no issue here, even in 'winter'.

    Did you happen to test the alcohol content in the two blends by any chance, to determine that they were actually as labelled? I suppose if you had the mixture issues then it shows they were certainly different. I wonder if maybe they even blend a higher octane petrol (gasoline) into the E70 to mitigate the octane loss from the mix ratio, such that the stoichiometric A/F ratio shows a larger variance than the knock resistance? It's things like this that make me wish pure alcohol fuel was road legal....
    The last time I ran into this scenario was at an E85 pump in Las Vegas sometime in 2017. We tested the E85 frequently. The ethanol content stayed consistent throughout the months but we did find that it varied between gas stations. (rebel gas vs Murphy's gas). Rebel had 85, murphy was around 65 if i recall. Both were labeled accurately. Murphy never claimed E85. The cars were able to be tuned to peak BDTC on both blends. Now, with narrow band ecus I wouldn't reckon its a good idea to run both though.

  2. #12
    Tropical Hoon Astrofizix's Avatar
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    Quote Originally Posted by hypoxia View Post
    The last time I ran into this scenario was at an E85 pump in Las Vegas sometime in 2017. We tested the E85 frequently. The ethanol content stayed consistent throughout the months but we did find that it varied between gas stations. (rebel gas vs Murphy's gas). Rebel had 85, murphy was around 65 if i recall. Both were labeled accurately. Murphy never claimed E85. The cars were able to be tuned to peak BDTC on both blends. Now, with narrow band ecus I wouldn't reckon its a good idea to run both though.
    Ok that makes sense. Over here we just have the one brand (United) doing E85, and I don't have anything personally that runs it so can't say what the state of play at the moment is. I do think about rebuilding my poor forgotten car and setting up for E85, but that would require I stop procrastinating about it, and I need to think about that....

  3. #13
    Tropical Hoon Astrofizix's Avatar
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    Quote Originally Posted by mittens View Post
    I was told that the fact these skis can not tell the change in the Mix, makes going to E85 a pain. as its cant sit for too long, and the pump e85 is inconsistent. On cars though its game changer, also being the fact you can just pull over and get more fuel.
    Yes I think you would need a full new engine management system to do it properly, Haltech etc. Not a small job.

    But I don't think that is right about E85 sitting for a long time, in fact my understanding is that it is more stable than gasoline. The alcohol does draw water in over time, but because E85 is mostly alcohol it won't seperate out like it does with E10 and blends like that. They are dangerous to store as you get a water layer down the bottom. But straight alcohol or E85 just absorbs the water as it is water based. And an engine can generally tolerate a few percent water in alcohol fuel if it isn't tuned to the limits of the fuel. I think in Brazil they allow up to around 5% water in their straight alcohol pump fuel.


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