<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">www.petro-canada.com</div><div dir="ltr"><br><blockquote type="cite">On May 7, 2021, at 6:27 AM, Bob Spidell <bspidell@comcast.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr">In the ‘States, fuel is blended with ethanol (thanks to the corn lobby). Dunno about Canada.</div><div dir="ltr"><br><blockquote type="cite">On May 7, 2021, at 5:59 AM, Michael Salter <michaelsalter@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">
<b><i>re: "Methanol[sic] lowers the boiling point ..."<br>
<br>
Typo?</i></b><span class="gmail-im"><br>
</span>
</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Have I got that wrong Bob?</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><i>"Following the crude oil price shocks of the 1970’s, methanol blends for use in the onroad<br>vehicle fleet began extensive studies in the later 1970’s and the 1980’s. Based on<br>this early research, methanol blends containing up to 15 vol% (M15) were successfully<br>operated by automakers or oil companies in a number of large vehicle fleet trials (<br>~ 1000 vehicles each) in Sweden, Germany, New Zealand and China during that<br>time. Also during that time period, methanol gasoline blends containing as much as 5 vol% with co-solvent alcohols were<br>commercially introduced in Europe and the U.S.A. Because carburetted fuel systems with older elastomer parts were part of<br>vehicle fleets on the road at that time and had limited ability to handled high oxygen content in the fuel, the fully commercial<br>methanol blends were generally limited to 3 to 5 vol% of the gasoline blend with some co-solvents also added to provide fuel<br>stability. However, with today’s modern pressurised fuel injector systems using feedback control loops and also using more<br>advance fuel system materials, current experience suggests that methanol blends as high as 15 vol% (M15) of the gasoline<br>blend with adequate co-solvents and corrosion inhibitors can now be successfully used in today’s more modern vehicles in<br>use today. Many provinces in China have been commercially using M15 blends as early as 2005, and China’s M15 use has<br>been expanding because of very favourable economics compared to higher cost petroleum fuels."</i></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><i><br></i></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">M<br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><i></i></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 6, 2021 at 11:03 AM Bob Spidell <<a href="mailto:bspidell@comcast.net">bspidell@comcast.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
re: "Methanol[sic] lowers the boiling point ..."<br>
<br>
Typo?<br>
<br>
<br>
<div>On 5/6/2021 6:51 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Hi Ken, yes I think everyone with a 100 has
encountered fuel delivery issues with modern fuels. Methanol
lowers the boiling point of petrol to a point where it becomes a
problem.
<div dir="auto">With the 100 there are 2 distinct issues. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Firstly, because the fuel pump and its
associated lines are directly above the exhaust pipe, hot air
heats them. The fuel in the suction side of the pump has,
effectively, a lower boiling point than it would at
atmospheric pressure. This fuel tends to boil if there isn't
sufficient air circulation to keep the pump and lines cooled,
as occurs while stopped in traffic on a hot day. True vapor
lock occurs because the pump will not pump sufficient volume
of vapour to exceed the rate of its production by the boiling
process.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Secondly the carburetor float chambers and the
small fuel passage to the jet are very close to the exhaust
manifold. </div>
<div dir="auto">The manifold radiates lots of heat which heats
them. Again when the car is moving at a reasonable pace the
incoming air through the grille and around the radiator is
sufficient to maintain the carburetor at a low enough
temperature to prohibit boiling but, again when stopped in
traffic this doesn't happen.</div>
<div dir="auto"><br>
</div>
<div dir="auto">I have managed to eliminate the first problem by
installing a insulating sleeve from a modern car's AC hose
over the fuel line from the tank to the pump.</div>
<div dir="auto"><br>
</div>
<div dir="auto">For the second I have made small heatshields
from 24 gauge galvanized steel to shield as much as possible
of the carburetors from the radiated heat. This has helped
considerably but not completely eliminated the problem. </div>
<div dir="auto"><br>
</div>
<div dir="auto">For the most part neither of these modifications
are visible and I have found that fuel delivery issues,
although not completely eliminated, are manageable. </div>
<div dir="auto">I am considering installing a small blower and
duct sourcing air from behind the grille to see how much
difference that makes but if course that will be visible.</div>
<div dir="auto">Hope that helps, others may have found better
solutions. </div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
<div dir="auto"><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon., May 3, 2021, 2:58
p.m. Ken Fleming, <<a href="mailto:ahmg@aol.com" target="_blank">ahmg@aol.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Michael , I
thought you maybe have experience this ans have a solution .
On my Bn1 which is M spec with carbs, advance distributed,
LeMans Cam and Pistons has always suffered from what I call
vapor lock of gas. Especially in hot weather . <br>
I am assuming the heat is from<br>
Manifold and it placement near carbs or fuel pump/ battery
near exhaust play a role but I could be wrong . I have asked
other owners and they seem most of them not to have same
problem. I do have a heat sheild added with little result.<br>
I am at a loss as to<br>
What to do<br>
Next , but have you experienced this and have any suggestions.
Are my assumptions<br>
Correct on heat causing the issue. Could today’s quality if
gas be a issue?<br>
I recall reading this was a common issue for 100’s to have
vapor issues. <br>
Ken<br>
<br>
</blockquote>
</div>
</blockquote>
<br>
</div>
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