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On 3 Dec 2003 at 21:51, Dave Moller wrote: > > From: Jim Adney [mailto:jadney@vwtype3.org] > > There's one uncertainly, and that's the fact that this assumes that the > > pressure drop between the IAD and the combustion chamber is linear with > > airflow. I don't know if that's true or not, but even if it's wrong, the > > linear > > assumption for small % increases of displacement should be pretty good > > approximations. > > Very roughly speaking, pressure drop in a tube will vary by the square of > the airflow velocity. Hmmm.... Would this also be the correct relationship between pressure drop across the intake venturi and airflow thru it? If so then we should only increase the fuel pressure by a ratio equal to the square root of (new displacement/old displacement). Have I done that right? -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org