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On 7 Dec 2003 at 20:43, Dave Moller wrote: > On 12/5/2003 Jim Adney wrote: > > Hmmm.... Would this also be the correct relationship between pressure drop > > across the intake venturi and airflow thru it? > > Yes. The relationship (Bernoulli's Equation if you're interested) holds for > a venturi too. I had a chance to think about this a bit more over the weekend and finally realized that we don't really care how the pressure drop across the venturi goes. It's still the pressure in the intake air distributor that is feeding the cylinders, and that is what the PS is measuring. So I still think an appropriate adjustment would be to increase the fuel pressure in proportion to the increase in displacement. This would be a linear approximation to the actual engne needs, which would be correct except for the non-linearity in the pressure drop between the IAD and the cylinder. Porting the heads somewhat, should actually compensate for that latter effect somewhat. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org