[Mgs] E10 or ethanol at 10%

i erbs eyera3000 at gmail.com
Mon Apr 19 09:51:04 MDT 2021


Im in my 2nd tank full of ethanol free fuel, and I still have idle die
issues at full stop situations when engine temp is 189 or higher. I pull
the choke out to prevent stalls.

Ira Erbs
1959 AH 100-6
1967 MGB
Milwaukie, OR

On Mon, Apr 19, 2021, 8:35 AM Barney Gaylord <barneymg at mgaguru.com> wrote:

> Paul (and others), -- Alcohol has about 40% lower energy content than
> gasoline, so the fuel economy will be lower by about 1-MPG.  Needing to
> burn 4% more fuel, you may need to re-adjust the fuel mixture slightly,
> about one flat down on the adjusting nut.  Most people will never notice
> the difference, and you can easily switch back and forth between E10 and
> zero-alcohol fuel on the fly with no problem.
>
> But there is one problem that does pop up to bite you sometimes,
> especially in hot weather.  Gasoline boils at 190dF.   Alcohol boils af
> 160dF.  This is a mixture of liquids, not a chemical compound.  If you warm
> it up to 160dF the alcohol will boil, and you can separate the alcohol out
> of the mixture by distillation while the gasoline content is not boiling.
>
> The problem is that fuel containing any amount of alcohol will boil at
> 160dF rather than 190dF.  This can be a big problem in warm weather with
> stop and go slow driving or standing still idling, or when you switch off
> for five minutes and then try to re-start.  When the alcohol boils it will
> result in bubbles in the fuel as it wants to flow through the main fuel jet
> past the metering needle.  Not much energy in the bubbles compared to
> liquid fuel, so the mixture goes extremely lean causing bad running or
> no-start.  The immediate fix is to pull the choke out to give it more fuel
> flow, which can get  the engine started or can get you through the bad
> running condition until you get moving and cool the carburetors down again.
>
> A longer term fix for this problem is to install a Bilge Blower fan in the
> MGA air intake duct to blow air to keep the carburetors cool enough to
> prevent boiling the alcohol.  There are several successive pages on this
> information, Start additional reading here:
> http://mgaguru.com/mgtech/carbs/cb207.htm
> http://mgaguru.com/mgtech/carbs/cb208b.htm
>
> Barney Gaylord
> 1958 MGA with an attitude
> http://MGAguru.com <http://mgaguru.com/>
>
>
> At 03:50 AM 4/19/2021, PaulHunt73 wrote:
>
> I'm looking for people with experience of using this in cars like the MGA
> and MGB in terms of what if any carb needle and timing changes have been
> found necessary, and any other problems.
>
> Thanks,
> PaulH.
> ....
>
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