<html><head></head><body>Why would it have to be round?<br><br>Sure, there are boundary effects and such, but the fuel velocity in the jet is low, reasonably constant, and the same as before. I would expect the side effects to be reasonably small. A 5% increase in effective opening should get pretty close to 5% more fuel, even if the opening is no longer a ring??<br>-- Randall<br><br><div class="gmail_quote">On 7 June 2019 13:40:24 GMT-07:00, Anthony Rhodes <spamiam@comcast.net> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">Even a file is too aggressive and can't possibly get it round enough<br><br>Ideally it would be in a lathe but that is really hard to do<br><br>The best way to do it by hand is to chuck it into a drill press and spin it. Then use fine sandpaper and remove brass in the desired area very gently. A thousandth of an inch makes a big difference! You are likely looking for around 0.005" removal. <br><br>I suspect that the mixture is a non-linear function of open cross section area. As the space between the needle and the jet gets wider, I bet the flow gets a lot easier. There could easily be issues of turbulent flow vs laminar flow as the walls get further apart. <br><br>Nevertheless my first approximation assuming a linear function resulted in a needle selection that seemed quite good for my engine. <br><br>-Tony<br><br>Sent from my 1837 Babbage Analytical Engine<br><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">On Jun 7, 2019, at 2:00 PM, triumphs-request@autox.team.net wrote:<br><br>Message: 4<br>Date: Thu, 6 Jun 2019 13:57:42 -0700<br>From: "Randall" <TR3driver@ca.rr.com><br>To: "'Greg Lemon'" <grglmn@gmail.com><br>Cc: <triumphs@autox.team.net>, "'Pete Arakelian'"<br> <Arakelianp@mossmotors.com><br>Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round<br> Sales of E15 Gasoline<br>Message-ID: <A977DEC0BB084269B41EE85B61224458@RYPC><br>Content-Type: text/plain; charset="us-ascii"<br><br><br>Those brass needles are really soft; I would suggest a fine tooth file and a<br>light touch rather than a Dremel. I haven't worked out how big the flat<br>should be, but it won't take much. You're only looking for something like<br>5% more fuel (or maybe 6%, depending on whose numbers you believe).<br><br>Again assuming you want to run E15 in the first place.<br><br>-- Randall<br></blockquote><br>** triumphs@autox.team.net **<br><br>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>Archive: <a href="http://www.team.net/pipermail/triumphs">http://www.team.net/pipermail/triumphs</a> <a href="http://www.team.net/archive">http://www.team.net/archive</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/triumphs/tr3driver@ca.rr.com">http://autox.team.net/mailman/options/triumphs/tr3driver@ca.rr.com</a><br></pre></blockquote></div></body></html>