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<DIV><FONT face=Arial size=2>It not just a matter of swelling with a YS silicone
diaphragm. If they go soft and spongy they also behave badly. A tip - you
need to look at the diaphragm immediately after you remove it from the
motor. If it is "belled" or distorted you could well have a bad one. I said
immediately because they go back to a flat shape quite quickly when not
inside of the pump.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have been fooled by this a couple of times until
I caught the little bugger doing it!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Eric.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=gfowler@raytheon.com href="mailto:gfowler@raytheon.com">Gray E
Fowler</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, February 21, 2006 10:00
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Acetone
in methanol?</DIV>
<DIV><BR></DIV><BR><FONT face=sans-serif size=2>Tom</FONT> <BR><BR><FONT
face=sans-serif size=2>Not sure of YS engines but most 2-stroke engine pumps
have a diaphram made of teflon coated glass, which is fine with the acetone,
but silicone fuel tubing will be deteriorated, as will any othe silicone part
(if any) in your engine. Viton will resist acetone okay (o-rings). Big
problem may be volatility as acetone will boil at about 40C (note that I
converted for your benefit) which is way lower than the other components in
fuel. If Acetone works and is not damaging your engine seals (use gasoline
tubing) try Methy-ethyl Ketone (MEK), more expensive, much less volatile (one
more carbon in the molecule). Next up the chain is methy-isopropyl Ketone,
which is a difficult product to obtain in the USA at a hardware store....gotta
go to Fisher chemical.</FONT> <BR><FONT face=sans-serif
size=2><BR><BR><BR>Gray Fowler<BR>Principal Chemical Engineer<BR>Composites
Engineering</FONT> <BR><BR><BR>
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<TD width="40%"><FONT face=sans-serif size=1><B>"Koenig, Tom"
<Tom.Koenig@actewagl.com.au></B> </FONT><BR><FONT face=sans-serif
size=1>Sent by: nsrca-discussion-bounces@lists.nsrca.org</FONT>
<P><FONT face=sans-serif size=1>02/20/2006 04:46 PM</FONT>
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<DIV align=center><FONT face=sans-serif size=1>Please respond
to<BR>NSRCA Mailing List
<nsrca-discussion@lists.nsrca.org></FONT></DIV></TR></TBODY></TABLE><BR></P>
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<DIV align=right><FONT face=sans-serif size=1>To</FONT></DIV>
<TD><FONT face=sans-serif size=1>"NSRCA"
<nsrca-discussion@lists.nsrca.org></FONT>
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<TD>
<DIV align=right><FONT face=sans-serif size=1>cc</FONT></DIV>
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<DIV align=right><FONT face=sans-serif size=1>Subject</FONT></DIV>
<TD><FONT face=sans-serif size=1>[NSRCA-discussion] Acetone in
methanol?</FONT></TR></TBODY></TABLE><BR>
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<TD></TR></TBODY></TABLE><BR></TR></TBODY></TABLE><BR><BR><BR><FONT
face="Comic Sans MS" size=3>Gentlemen,</FONT> <BR><FONT face="Comic Sans MS"
size=3>You may be aware most of us down here mix our own fuel. We have
available pure Methanol or a methanol product 'Shell A' which has 3% Acetone
in it.</FONT> <BR><FONT face="Comic Sans MS" size=3>I have added 2-3% acetone
into my fuel mix ( I buy pure Methanol) and I'm not sure if I could detect a
difference, if any at all. It may have idled a bit better-but it could have
been my imagination??</FONT> <BR><FONT size=3> </FONT> <BR><FONT
face="Comic Sans MS" size=3>So my question is-what exactly can/does Acetone do
in our fuel mixes?? Does it do anything at all?? </FONT><BR><FONT
size=3> </FONT> <BR><FONT face="Comic Sans MS" size=3>Thanks for any
insight.</FONT> <BR><FONT size=3> </FONT> <BR><FONT face="Comic Sans MS"
size=3>Tom</FONT>
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