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I would have thought you can get +\- 5% changes just in the adjustments av=
ailable.
The other consideration is what does the alcohol do the the rubber parts in=
the fuel system.=C2=A0 Here in the Midwest we have had 5% alcohol in our g=
as for decades.=C2=A0 Both my cars suffered fuel pump failures when the pum=
p diaphragm=C2=A0 went all stiff and cardboardy on me.=C2=A0 I fitted an el=
ectric pump to the TR6 and a rebuild kit in the TR3 is still working just f=
ine.=C2=A0 Replacing all the fuel hoses is a good idea, too.
=20
Dave=20
=20
=20
-----Original Message-----
From: Michael Porter <mdporter@dfn.com>
To: Randall <TR3driver@ca.rr.com>; 'Greg Lemon' <grglmn@gmail.com>
Cc: triumphs <triumphs@autox.team.net>; 'Pete Arakelian' <Arakelianp@mossmo=
tors.com>
Sent: Thu, Jun 6, 2019 4:59 pm
Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round Sales =
of E15 Gasoline
On 6/6/2019 2:57 PM, Randall wrote:
>
> Those brass needles are really soft; I would suggest a fine tooth file an=
d a
> light touch rather than a Dremel.=C2=A0 I haven't worked out how big the =
flat
> should be, but it won't take much.=C2=A0 You're only looking for somethin=
g like
> 5% more fuel (or maybe 6%, depending on whose numbers you believe).
>
> Again assuming you want to run E15 in the first place.
>
The calculation is .85 x 115.5 + .15 x 76.0/115.5 =3D 0.94874, nominally -=
=20
5.125%.=C2=A0 But, there are other considerations.=C2=A0 The latent heat of=
=20
evaporation of alcohol is pretty high, so the flame front will propagate=20
a bit more slowly, which means the advance can be raised slightly.=C2=A0 An=
d,=20
since the octane rating for ethanol is 110, the compression ratio can be=20
raised slightly with no ill effect.=C2=A0 Both of those effects translate t=
o=20
slightly better mileage, or at least mitigate the loss in fuel value.=C2=A0=
=20
The octane increase is not insubstantial.=C2=A0 If the gasoline in the blen=
d=20
is 87 octane, the total blend with 15% ethanol is 90.5.
Anyone operating at altitudes well above sea level will probably see a=20
slight improvement in performance, because of an oxygen atom in the=20
alcohol molecule, presuming that all else is right with the engine=20
(i.e., mixture correct and timing adjusted for altitude).
The bugaboo, I suppose, is that some people may still have rubber hoses=20
installed that aren't alcohol-proof, and that's something that would=20
have to be corrected.=C2=A0 Buna-n (nitrile) will work, but with shorter=20
life, but neoprene or SBR (styrene-butadiene rubber) would have good=20
resistance to alcohol and are readily available. Anyone contemplating=20
replacement of rubber hoses with braided stainless steel w/Teflon liners=20
should avoid that.=C2=A0 Nylon or XLPE liners are fine.
But, in general, go easy on needle mods.=C2=A0 For SUs and Strombergs, simp=
le=20
mixture enrichment and a little fiddling with the advance may get one=20
most of the way there.=C2=A0 Plug cuts will tell the tale.
Cheers.
--=20
Michael Porter
Roswell, NM
Never let anyone drive you crazy when you know it's within walking distance=
....
------=_Part_13273_1586415717.1559870110701
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<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">I would have thought you can get +\- 5% changes just=
in the adjustments available.</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">The other consideration is what does the alcohol do t=
he the rubber parts in the fuel system. Here in the Midwest we have h=
ad 5% alcohol in our gas for decades. Both my cars suffered fuel pump=
failures when the pump diaphragm went all stiff and cardboardy on me=
. I fitted an electric pump to the TR6 and a rebuild kit in the TR3 i=
s still working just fine. Replacing all the fuel hoses is a good ide=
a, too.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Michael Porter <mdporter@dfn.com><br>
To: Randall <TR3driver@ca.rr.com>; 'Greg Lemon' <grglmn@gmail.com&=
gt;<br>
Cc: triumphs <triumphs@autox.team.net>; 'Pete Arakelian' <Arakelia=
np@mossmotors.com><br>
Sent: Thu, Jun 6, 2019 4:59 pm<br>
Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round Sales =
of E15 Gasoline<br>
<br>
<div dir=3D"ltr">On 6/6/2019 2:57 PM, Randall wrote:<br clear=3D"none">>=
<br clear=3D"none">> Those brass needles are really soft; I would sugges=
t a fine tooth file and a<br clear=3D"none">> light touch rather than a =
Dremel. I haven't worked out how big the flat<br clear=3D"none">> =
should be, but it won't take much. You're only looking for something =
like<br clear=3D"none">> 5% more fuel (or maybe 6%, depending on whose n=
umbers you believe).<br clear=3D"none">><br clear=3D"none">> Again as=
suming you want to run E15 in the first place.<br clear=3D"none">><br cl=
ear=3D"none">The calculation is .85 x 115.5 + .15 x 76.0/115.5 =3D 0.94874,=
nominally - <br clear=3D"none">5.125%. But, there are other consider=
ations. The latent heat of <br clear=3D"none">evaporation of alcohol =
is pretty high, so the flame front will propagate <br clear=3D"none">a bit =
more slowly, which means the advance can be raised slightly. And, <br=
clear=3D"none">since the octane rating for ethanol is 110, the compression=
ratio can be <br clear=3D"none">raised slightly with no ill effect. =
Both of those effects translate to <br clear=3D"none">slightly better milea=
ge, or at least mitigate the loss in fuel value. <br clear=3D"none">T=
he octane increase is not insubstantial. If the gasoline in the blend=
<br clear=3D"none">is 87 octane, the total blend with 15% ethanol is 90.5.=
<br clear=3D"none"><br clear=3D"none">Anyone operating at altitudes well ab=
ove sea level will probably see a <br clear=3D"none">slight improvement in =
performance, because of an oxygen atom in the <br clear=3D"none">alcohol mo=
lecule, presuming that all else is right with the engine <br clear=3D"none"=
>(i.e., mixture correct and timing adjusted for altitude).<br clear=3D"none=
"><br clear=3D"none">The bugaboo, I suppose, is that some people may still =
have rubber hoses <br clear=3D"none">installed that aren't alcohol-proof, a=
nd that's something that would <br clear=3D"none">have to be corrected.&nbs=
p; Buna-n (nitrile) will work, but with shorter <br clear=3D"none">life, bu=
t neoprene or SBR (styrene-butadiene rubber) would have good <br clear=3D"n=
one">resistance to alcohol and are readily available. Anyone contemplating =
<br clear=3D"none">replacement of rubber hoses with braided stainless steel=
w/Teflon liners <br clear=3D"none">should avoid that. Nylon or XLPE =
liners are fine.<br clear=3D"none"><br clear=3D"none">But, in general, go e=
asy on needle mods. For SUs and Strombergs, simple <br clear=3D"none"=
>mixture enrichment and a little fiddling with the advance may get one <br =
clear=3D"none">most of the way there. Plug cuts will tell the tale.<b=
r clear=3D"none"><br clear=3D"none"><br clear=3D"none">Cheers.<br clear=3D"=
none"><br clear=3D"none">-- <br clear=3D"none"><br clear=3D"none"><br clear=
=3D"none">Michael Porter<br clear=3D"none">Roswell, NM<br clear=3D"none"><b=
r clear=3D"none"><br clear=3D"none">Never let anyone drive you crazy when y=
ou know it's within walking distance....
<div class=3D"yqt3748769791" id=3D"yqtfd90501"><br clear=3D"none"><br clear=
=3D"none"><br clear=3D"none"><br clear=3D"none"></div>
</div>
</div>
</div>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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