ericmpmail-rv10(at)yahoo.
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 Posted: Fri Apr 28, 2006 7:57 am Post subject: Autogas for 540 - autogas vapor pressure |
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Hi Kelly, I completely agree. I typed lower but meant
higher just as you described. With a hot tunnel at
altitude potential for vapor lock is high. I think
winter gas has an even higher vapor pressure.
For sealing the tanks I was going to use friction stir
welding - just like the Eclipse jet. Harbor Freight
has a special on one and includes free pocket knife if
you act now.... kidding!
Eric
--- Kelly McMullen <kellym(at)aviating.com> wrote:
| Quote: |
<kellym(at)aviating.com>
Umm, err, how do I put this? 100LL is 7.0 RVP. Most
summer mogas is
7.6-9.0 RVP. Adding ethanol raises the RVP about 1
point. The higher the
RVP the more hazard of vapor lock. That means mogas
with ethanol has a
higher vapor pressure.
Even if you engine is fine with the fuel, how are
you going to keep it
in the wet wing tanks after it softens the PRC? Are
you going to want to
reseal those tanks every few years?
Eric Panning wrote:
>
<ericmpmail-rv10(at)yahoo.com>
>
> ECi Titan IO-540 kit engine (~ 2007?) is supposed
to
> be autofuel capable. This is partly because they
are
> using a fuel spider with fixed orifice and not a
fuel
> servo with some autogas sensitive components.
Still
> they rec 100LL initial for valves. Note this
system
> requires a return fuel line. I have built these
> fittings into my tanks just in case. Part of
reason
> for return line is to return any vapor to tank.
> Autogas and ethanol autogas in particular has
lower
> vapor pressure. Ethanol is also a good solvent for
> lots of things....
>
> Deltahawk claims they sold out 2005 and 2006
> production runs but I have never seen a builder
site
> which makes me wonder if they really have that
many
> out there. I saw one article that 2005 run was
only
> two engines.
>
> A number of builders are looking at rotary engines
as
> well.
>
> Eric
>
>
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