eec egr scheme

[Clive Apps Techno-Logicals 416 510 0020]

> 
> >with added EGR it will be neither rich nor lean
> >the extra inert gas is not flowing through any of the metering system
> >that affects incoming air, it is rerouted internally in the block
> >so the A/F stays in sync
> >but the timing has to be advanced to let it burn properly
> 
> It's true only for EFI with Mass Air Sensor like Bosch systems.  In EFI with
> MAP sensor
> extra inert gas will increase manifold
> presser and A/F will be rich.
> 
> I think so!

that is why we have O2 sensors and ECUs

I also suspect that the mixture may also have to be slightly richer 
to burn properly when it is diluted with inert gases
the hot exhuast also heats the incoming which should give slightly better
combustion
lots of variables, I have a 500 line dissertation on EGR if anyone wants me to
post it, lots of tech details

Clive