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> -----Original Message----- > 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. Tube size, tube roughness and their effects at various airflows play a part too. I'd agree that small increases will not put you too far off a linear assumption. I believe I read somewhere that some of the Porsche folks have been able to go up 20% in motor displacement without trouble by tweaking fuel pressure and/or the head temp sensor resistive value. I've never tried it myself though. Just my 2 cents. Dave moller ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org