pintle vs. disc injector types

[Clint Corbin]

At 05:57 PM 8/21/97 -0700, you wrote:
>A follow-up to this, if I might.  In the turbocharged applications I'm
>familiar with, a 1:1 fuel pressure regulator is used, which increases
>fuel rail pressure in direct proportion to the increase in boost
>pressure.  What I'm wondering is, if the presssure downstream of the
>injector has increased by the same amount as the pressure upstream of
>the injector, won't this affect the predicted outcome?  And if it will,

<snip>

Michael,

As far as the injector is concerned with, all that matters is the 
pressure differential between the fuel side of the injector and the
intake manifold.  If you increased the manifold pressure by 100psi
and also increase the fuel rail pressure by the same 100psi, you 
should have the exact same flow rate as before.  All you are doing
when you tie fuel rail pressure to boost pressure is preventing 
the flow rate for a given duty cycle from falling off as the boost 
pressure increases.  Software would still have to take care of the
increased fuel demand required by the boost pressure.

>Best,
>
>Michael McBroom


Clint Corbin
ccorbin at rt66.com
ccorbin at intel9.intel.com