Manifold vaccuum, EGR & long duration cams

[Tony Bryant]

> Tony,
> I think you would be better off going with a table. Fill it with #s that 
> work through trial and error and forget the airflow calculation.
> 
> You've probably got pulsations on the plenum. So you need to either
> filter them out or time your map readings to the crank, or the system will 
> go nuts.
> 
> Since the engine idled on the other system, it will obviously idle on
> this one if it is fed the same fuel and timing.
> 
> Fred

The difference between the two setup in the plenum chamber setup has 
steady state vaccumm, whereas the DCOE setup does not.

The plenum chamber setup therefore give me lots of (unintentional) 
EGR, whereas the DCOE doesn't.

BTW the plenum chamber is large enough (6 litres) to damp ANYTHING.