[TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round Sales of E15 Gasoline

[Anthony Rhodes]

Even a file is too aggressive and can't possibly get it round enough

Ideally it would be in a lathe but that is really hard to do

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.  

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.  

Nevertheless my first approximation assuming a linear function resulted in a needle selection that seemed quite good for my engine. 

-Tony

Sent from my 1837 Babbage Analytical Engine

> On Jun 7, 2019, at 2:00 PM, triumphs-request at autox.team.net wrote:
> 
> Message: 4
> Date: Thu, 6 Jun 2019 13:57:42 -0700
> From: "Randall" <TR3driver at ca.rr.com>
> To: "'Greg Lemon'" <grglmn at gmail.com>
> Cc: <triumphs at autox.team.net>, "'Pete Arakelian'"
>    <Arakelianp at mossmotors.com>
> Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round
>    Sales of E15 Gasoline
> Message-ID: <A977DEC0BB084269B41EE85B61224458 at RYPC>
> Content-Type: text/plain;    charset="us-ascii"
> 
> 
> Those brass needles are really soft; I would suggest a fine tooth file and a
> light touch rather than a Dremel.  I haven't worked out how big the flat
> should be, but it won't take much.  You're only looking for something like
> 5% more fuel (or maybe 6%, depending on whose numbers you believe).
> 
> Again assuming you want to run E15 in the first place.
> 
> -- Randall