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Thread: Look what E-85 did to my valves… ?

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    Look what E-85 did to my valves… ?

    I had to pull the engine to install one of our new lightweight flywheels and figured it was a good time to take a peek under the head to see how everything’s been coping with 17psi for the last several months. Here is what I found… Thoughts?


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    Last edited by DirtGearTv; 10-31-2021 at 06:19 PM.

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    Oh forget to share the aluminum flywheel pics they are 6.5lbs available for purchase as well as our clutches
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    Is that carbon buildup from dirty fuel?

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)


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    Quote Originally Posted by Eggman View Post
    Is that carbon buildup from dirty fuel?
    I was kinda hoping someone with more engine or e-85 experience would tell me what the heck it is… I mean it’s not like carbon, it’s got a real rusty calcified look and feel to it. Kinda like those hard water stains on shower heads. Bazaar, never happened before on pump gas has so it must be the e-85. Possibly moisture being absorbed through my gas tank seals or something

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    I had my 2.6 head off at 150,000 miles for a seeping head gasket leak and it was not that bad and that was leaded fuel in 1986!
    Karl

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    17 psi? Turbo?
    Karl

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    Quote Originally Posted by CROSSBOLT View Post
    I had my 2.6 head off at 150,000 miles for a seeping head gasket leak and it was not that bad and that was leaded fuel in 1986!
    I know right? and I only put this head back together like 4 months ago, it was spotless then… It deff wasn’t a blown head gasket so must have been the e85

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    E85 is hydroscopic, so it can absorb moisture. Is your E85 pure and from a good source?

    It shouldn't cause that on good clean fuel... but I guess it is possible if it had enough moisture content.
    Resident Tire Engineer

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.4 mpg (US) ... 18.9 km/L ... 5.3 L/100 km ... 53.3 mpg (Imp)


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    Quote Originally Posted by Basic View Post
    E85 is hydroscopic, so it can absorb moisture. Is your E85 pure and from a good source?

    It shouldn't cause that on good clean fuel... but I guess it is possible if it had enough moisture content.
    It’s pump e-85 from my local gas station. It’s not super high quality, says right on pump between 50-85% content. So depending on time of year I may only have E50 but still the lower content E shouldn’t cause this issue. If anything lower content E would be more resistant to moisture…

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    Quote Originally Posted by DirtGearTv View Post
    It’s pump e-85 from my local gas station. It’s not super high quality, says right on pump between 50-85% content. So depending on time of year I may only have E50 but still the lower content E shouldn’t cause this issue. If anything lower content E would be more resistant to moisture…
    My 2017 Mirage owner's manual states up to E10 is OK.

    So why are expecting a car that isn't designed for E85 fuel to be ok with it?

    I may have missed some earlier discussion or something.



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