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<div> <font size="3">I would have thought you can get +\- 5% changes just in the adjustments available.</font></div>
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<div><font size="3">The other consideration is what does the alcohol do the the rubber parts in the fuel system. Here in the Midwest we have had 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 is still working just fine. Replacing all the fuel hoses is a good idea, too.</font><br>
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<div style="clear:both"><font size="4">Dave </font><br>
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<div style="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><br>
Cc: triumphs <triumphs@autox.team.net>; 'Pete Arakelian' <Arakelianp@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>
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<div dir="ltr">On 6/6/2019 2:57 PM, Randall wrote:<br clear="none">><br clear="none">> Those brass needles are really soft; I would suggest a fine tooth file and a<br clear="none">> light touch rather than a Dremel. I haven't worked out how big the flat<br clear="none">> should be, but it won't take much. You're only looking for something like<br clear="none">> 5% more fuel (or maybe 6%, depending on whose numbers you believe).<br clear="none">><br clear="none">> Again assuming you want to run E15 in the first place.<br clear="none">><br clear="none">The calculation is .85 x 115.5 + .15 x 76.0/115.5 = 0.94874, nominally - <br clear="none">5.125%. But, there are other considerations. The latent heat of <br clear="none">evaporation of alcohol is pretty high, so the flame front will propagate <br clear="none">a bit more slowly, which means the advance can be raised slightly. And, <br clear="none">since the octane rating for ethanol is 110, the compression ratio can be <br clear="none">raised slightly with no ill effect. Both of those effects translate to <br clear="none">slightly better mileage, or at least mitigate the loss in fuel value. <br clear="none">The octane increase is not insubstantial. If the gasoline in the blend <br clear="none">is 87 octane, the total blend with 15% ethanol is 90.5.<br clear="none"><br clear="none">Anyone operating at altitudes well above sea level will probably see a <br clear="none">slight improvement in performance, because of an oxygen atom in the <br clear="none">alcohol molecule, presuming that all else is right with the engine <br clear="none">(i.e., mixture correct and timing adjusted for altitude).<br clear="none"><br clear="none">The bugaboo, I suppose, is that some people may still have rubber hoses <br clear="none">installed that aren't alcohol-proof, and that's something that would <br clear="none">have to be corrected. Buna-n (nitrile) will work, but with shorter <br clear="none">life, but neoprene or SBR (styrene-butadiene rubber) would have good <br clear="none">resistance to alcohol and are readily available. Anyone contemplating <br clear="none">replacement of rubber hoses with braided stainless steel w/Teflon liners <br clear="none">should avoid that. Nylon or XLPE liners are fine.<br clear="none"><br clear="none">But, in general, go easy on needle mods. For SUs and Strombergs, simple <br clear="none">mixture enrichment and a little fiddling with the advance may get one <br clear="none">most of the way there. Plug cuts will tell the tale.<br clear="none"><br clear="none"><br clear="none">Cheers.<br clear="none"><br clear="none">-- <br clear="none"><br clear="none"><br clear="none">Michael Porter<br clear="none">Roswell, NM<br clear="none"><br clear="none"><br clear="none">Never let anyone drive you crazy when you know it's within walking distance....
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